{"id":19405,"date":"2025-05-13T23:59:05","date_gmt":"2025-05-13T20:59:05","guid":{"rendered":"https:\/\/diagnozabam.ro\/sfaturi\/?p=19405"},"modified":"2026-07-23T16:41:10","modified_gmt":"2026-07-23T13:41:10","slug":"cum-verifici-impedanta-boxei-cu-multimetrul","status":"publish","type":"post","link":"https:\/\/diagnozabam.ro\/sfaturi\/ro\/blog\/cum-verifici-impedanta-boxei-cu-multimetrul\/","title":{"rendered":"Cum M\u0103sori Impedan\u021ba unei Boxe cu Multimetrul"},"content":{"rendered":"<h2 data-path-to-node=\"2\">Cum M\u0103sori Impedan\u021ba unei Boxe cu Multimetrul: Ghid Detaliat \u0219i Rigoare Tehnic\u0103<\/h2>\n<p data-path-to-node=\"3\">Procesul de configurare a unui sistem audio \u2014 fie c\u0103 vorbim despre un proiect <b data-path-to-node=\"3\" data-index-in-node=\"78\">car audio<\/b> personalizat, fie despre un sistem <b data-path-to-node=\"3\" data-index-in-node=\"123\">home cinema<\/b> sau o instala\u021bie de sonorizare profesional\u0103 (PA) \u2014 depinde direct de potrivirea corect\u0103 a sarcinilor <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/ro\/blog\/autonomie-masini-electrice-2026-ce-modele-conduc-topul\/\">electrice<\/a>. O eroare aparent minor\u0103 privind potrivirea sarcinilor poate duce la declan\u0219area protec\u021biilor termice ale amplificatorului, la distorsiuni armonice pronun\u021bate sau, \u00een cel mai r\u0103u caz, la distrugerea etajului final de putere.<\/p>\n<p data-path-to-node=\"4\">De\u0219i determinarea exact\u0103 a impedan\u021bei acustice necesit\u0103 echipamente de laborator (cum ar fi un generator de semnal \u0219i un osciloscop), utilizarea unui <b data-path-to-node=\"4\" data-index-in-node=\"150\"><a href=\"https:\/\/diagnozabam.ro\/sfaturi\/ro\/blog\/multimetrul-care-te-salveaza-la-orice-testare\/\">multimetru<\/a> digital<\/b> r\u0103m\u00e2ne cea mai rapid\u0103, accesibil\u0103 \u0219i eficient\u0103 metod\u0103 de diagnosticare rapid\u0103 pe teren.<\/p>\n<div class=\"code-block ng-tns-c1691524436-233 ng-animate-disabled ng-trigger ng-trigger-codeBlockRevealAnimation\" data-hveid=\"0\" data-ved=\"0CAAQhtANahgKEwiJhKnB6uiVAxUAAAAAHQAAAAAQmgQ\">\n<div class=\"formatted-code-block-internal-container ng-tns-c1691524436-233\">\n<div class=\"animated-opacity ng-tns-c1691524436-233\">\n<pre class=\"ng-tns-c1691524436-233\"><code class=\"code-container formatted ng-tns-c1691524436-233 no-decoration-radius\" role=\"text\" data-test-id=\"code-content\">+---------------------------------------------------------------------------------+\r\n|               DIAGNOSTICARE RAPID\u0102 A DIFUZORULUI CU MULTIMETRUL                 |\r\n+---------------------------------------------------------------------------------+\r\n|                                                                                 |\r\n|  [ <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/ro\/blog\/multimetrul-care-te-salveaza-la-orice-testare\/\">Multimetru<\/a> pe Scala 200 \u03a9 ] ---&gt; [ M\u0103surare Borne Borne + \/ - ]              |\r\n|                                                  |                              |\r\n|           +--------------------------------------+--------------------+         |\r\n|           v                                                           v         |\r\n|  [ Citire ~ 3.2 - 3.6 \u03a9 ]                                   [ Citire OL \/ \u221e ]   |\r\n|  =&gt; Difuzor OK (Nominal 4 \u03a9)                                =&gt; Bobin\u0103 \u00centrerupt\u0103|\r\n|                                                                                 |\r\n+---------------------------------------------------------------------------------+\r\n<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<p data-path-to-node=\"0\">Ai dreptate, \u00eemi cer scuze din nou! Am folosit LaTeX (<span class=\"math-inline\" data-math=\"R_e\" data-index-in-node=\"54\">$R_e$<\/span>, <span class=\"math-inline\" data-math=\"Z\" data-index-in-node=\"59\">$Z$<\/span>, etc.) \u0219i la Punctul 1, de\u0219i era vorba despre concepte simple de rezisten\u021b\u0103 \u0219i impedan\u021b\u0103 exprimate \u00een Ohmi.<\/p>\n<p data-path-to-node=\"1\">Iat\u0103 <b data-path-to-node=\"1\" data-index-in-node=\"5\">Punctul 1 complet rescris \u00een text simplu<\/b>, f\u0103r\u0103 absolut niciun simbol sau cod LaTeX:<\/p>\n<h2 data-path-to-node=\"3\">1. Fizica din Spatele M\u0103sur\u0103torii: Diferen\u021ba dintre Rezisten\u021b\u0103 (Re) \u0219i Impedan\u021b\u0103 (Z)<\/h2>\n<p data-path-to-node=\"4\">Cea mai frecvent\u0103 confuzie \u00een electronica audio este suprapunerea no\u021biunilor de <b data-path-to-node=\"4\" data-index-in-node=\"80\">rezisten\u021b\u0103 \u00een <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/ro\/blog\/multimetrul-care-te-salveaza-la-orice-testare\/\">curent continuu<\/a><\/b> (notat\u0103 Re) \u0219i <b data-path-to-node=\"4\" data-index-in-node=\"125\">impedan\u021b\u0103 nominal\u0103<\/b> (notat\u0103 Z).<\/p>\n<div class=\"code-block ng-tns-c1691524436-255 ng-animate-disabled ng-trigger ng-trigger-codeBlockRevealAnimation\" data-hveid=\"0\" data-ved=\"0CAAQhtANahgKEwiJhKnB6uiVAxUAAAAAHQAAAAAQ0gQ\">\n<div class=\"formatted-code-block-internal-container ng-tns-c1691524436-255\">\n<div class=\"animated-opacity ng-tns-c1691524436-255\">\n<pre class=\"ng-tns-c1691524436-255\"><code class=\"code-container formatted ng-tns-c1691524436-255 no-decoration-radius\" role=\"text\" data-test-id=\"code-content\">+---------------------------------------------------------------------------------+\r\n|                       REZISTEN\u021a\u0102 (<a href=\"https:\/\/diagnozabam.ro\/sfaturi\/ro\/blog\/multimetrul-care-te-salveaza-la-orice-testare\/\">DC<\/a>) VS. IMPEDAN\u021a\u0102 (<a href=\"https:\/\/diagnozabam.ro\/sfaturi\/ro\/blog\/multimetrul-care-te-salveaza-la-orice-testare\/\">AC<\/a>)                        |\r\n+---------------------------------------------------------------------------------+\r\n|                                                                                 |\r\n|  REZISTEN\u021a\u0102 <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/ro\/blog\/multimetrul-care-te-salveaza-la-orice-testare\/\">DC<\/a> (Re) ---------&gt; Tensiune Constant\u0103 (Semnal <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/ro\/blog\/multimetrul-care-te-salveaza-la-orice-testare\/\">Multimetru<\/a>)           |\r\n|                                 - Valoare fix\u0103 \u00een Ohmi                          |\r\n|                                 - M\u0103soar\u0103 doar rezisten\u021ba s\u00e2rmei                |\r\n|                                                                                 |\r\n|  IMPEDAN\u021a\u0102 <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/ro\/blog\/multimetrul-care-te-salveaza-la-orice-testare\/\">AC<\/a> (Z) ------------&gt; Semnal Alternativ Variabil (Muzic\u0103)             |\r\n|                                 - Variaz\u0103 \u00een func\u021bie de frecven\u021b\u0103 (Hz)          |\r\n|                                 - Include rezisten\u021ba s\u00e2rmei \u0219i reactan\u021ba        |\r\n|                                                                                 |\r\n+---------------------------------------------------------------------------------+\r\n<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<h3 data-path-to-node=\"6\">De ce un multimetru nu m\u0103soar\u0103 direct impedan\u021ba?<\/h3>\n<ul data-path-to-node=\"7\">\n<li>\n<p data-path-to-node=\"7,0,0\"><b data-path-to-node=\"7,0,0\" data-index-in-node=\"0\">Multimetrul<\/b> injecteaz\u0103 un <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/ro\/blog\/multimetrul-care-te-salveaza-la-orice-testare\/\">curent continuu<\/a> (<a href=\"https:\/\/diagnozabam.ro\/sfaturi\/ro\/blog\/multimetrul-care-te-salveaza-la-orice-testare\/\">DC<\/a>) de valoare foarte mic\u0103 prin bornele de test. El m\u0103soar\u0103 exclusiv <b data-path-to-node=\"7,0,0\" data-index-in-node=\"112\">rezisten\u021ba ohmic\u0103 a s\u00e2rmei de cupru sau aluminiu<\/b> din care este \u00eenf\u0103\u0219urat\u0103 bobina difuzorului (Re).<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"7,1,0\"><b data-path-to-node=\"7,1,0\" data-index-in-node=\"0\">Impedan\u021ba (Z)<\/b> este o m\u0103rime complex\u0103, valabil\u0103 \u00een <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/ro\/blog\/multimetrul-care-te-salveaza-la-orice-testare\/\">curent alternativ<\/a> (<a href=\"https:\/\/diagnozabam.ro\/sfaturi\/ro\/blog\/multimetrul-care-te-salveaza-la-orice-testare\/\">AC<\/a>). Difuzorul este un element electro-mecanic ce con\u021bine o inductan\u021b\u0103 (bobina aflat\u0103 \u00een c\u00e2mpul <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/ro\/blog\/legalitatea-suporturilor-magnetice-pentru-numerele-de-inmatriculare\/\">magnetic<\/a> al magnetului). Pe m\u0103sur\u0103 ce frecven\u021ba semnalului audio se modific\u0103 (de la ba\u0219i la \u00eenalte), rezisten\u021ba opus\u0103 de difuzor variaz\u0103 constant.<\/p>\n<\/li>\n<\/ul>\n<blockquote data-path-to-node=\"8\">\n<p data-path-to-node=\"8,0\">\ud83d\udca1 <b data-path-to-node=\"8,0\" data-index-in-node=\"3\">Regula de Aur (Raportul Ohm-Impedan\u021b\u0103):<\/b> Rezisten\u021ba \u00een <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/ro\/blog\/multimetrul-care-te-salveaza-la-orice-testare\/\">curent continuu<\/a> (Re) reprezint\u0103 \u00een mod tipic \u00eentre <b data-path-to-node=\"8,0\" data-index-in-node=\"108\">75% \u0219i 85%<\/b> din impedan\u021ba nominal\u0103 (Z) specificat\u0103 pe fi\u0219a tehnic\u0103 a difuzorului.<\/p>\n<\/blockquote>\n<table data-path-to-node=\"9\">\n<thead>\n<tr>\n<td><strong>Impedan\u021b\u0103 Nominal\u0103 (Z)<\/strong><\/td>\n<td><strong>Rezisten\u021b\u0103 <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/ro\/blog\/multimetrul-care-te-salveaza-la-orice-testare\/\">DC<\/a> M\u0103surat\u0103 (Re)<\/strong><\/td>\n<td><strong>Aplica\u021bii Tipice<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><span data-path-to-node=\"9,1,0,0\"><b data-path-to-node=\"9,1,0,0\" data-index-in-node=\"0\">2 Ohmi<\/b><\/span><\/td>\n<td><span data-path-to-node=\"9,1,1,0\"><b data-path-to-node=\"9,1,1,0\" data-index-in-node=\"0\">1.5 \u2013 1.8 Ohmi<\/b><\/span><\/td>\n<td><span data-path-to-node=\"9,1,2,0\">Subwoofere auto de \u00eenalt\u0103 performan\u021b\u0103, configura\u021bii Dual Voice Coil.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"9,2,0,0\"><b data-path-to-node=\"9,2,0,0\" data-index-in-node=\"0\">4 Ohmi<\/b><\/span><\/td>\n<td><span data-path-to-node=\"9,2,1,0\"><b data-path-to-node=\"9,2,1,0\" data-index-in-node=\"0\">3.2 \u2013 3.7 Ohmi<\/b><\/span><\/td>\n<td><span data-path-to-node=\"9,2,2,0\">Standardul dominant \u00een industria Car Audio \u0219i difuzoare portabile.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"9,3,0,0\"><b data-path-to-node=\"9,3,0,0\" data-index-in-node=\"0\">6 Ohmi<\/b><\/span><\/td>\n<td><span data-path-to-node=\"9,3,1,0\"><b data-path-to-node=\"9,3,1,0\" data-index-in-node=\"0\">4.5 \u2013 5.2 Ohmi<\/b><\/span><\/td>\n<td><span data-path-to-node=\"9,3,2,0\">Sisteme Home Cinema integrate, receivere AV comerciale (Sony, Pioneer).<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"9,4,0,0\"><b data-path-to-node=\"9,4,0,0\" data-index-in-node=\"0\">8 Ohmi<\/b><\/span><\/td>\n<td><span data-path-to-node=\"9,4,1,0\"><b data-path-to-node=\"9,4,1,0\" data-index-in-node=\"0\">6.1 \u2013 6.8 Ohmi<\/b><\/span><\/td>\n<td><span data-path-to-node=\"9,4,2,0\">Standardul <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/ro\/blog\/foxwell-nt624-elite-scaner-all-system-clasic\/\">clasic<\/a> \u00een Hi-Fi de cas\u0103, monitoare de studio \u0219i boxe profesionale.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"9,5,0,0\"><b data-path-to-node=\"9,5,0,0\" data-index-in-node=\"0\">16 Ohmi<\/b><\/span><\/td>\n<td><span data-path-to-node=\"9,5,1,0\"><b data-path-to-node=\"9,5,1,0\" data-index-in-node=\"0\">12.5 \u2013 13.8 Ohmi<\/b><\/span><\/td>\n<td><span data-path-to-node=\"9,5,2,0\">Sisteme vintage, difuzoare de instrument (amplificatoare de chitar\u0103).<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 data-path-to-node=\"7\"><span style=\"font-size: 16px;\">2. Ghid Pas cu Pas pentru M\u0103surarea Corect\u0103<\/span><\/h2>\n<p data-path-to-node=\"16\">Pentru a ob\u021bine o citire precis\u0103 \u0219i pentru a proteja instrumentele de m\u0103sur\u0103, urma\u021bi acest protocol tehnic:<\/p>\n<div class=\"code-block ng-tns-c1691524436-235 ng-animate-disabled ng-trigger ng-trigger-codeBlockRevealAnimation\" data-hveid=\"0\" data-ved=\"0CAAQhtANahgKEwiJhKnB6uiVAxUAAAAAHQAAAAAQngQ\">\n<div class=\"formatted-code-block-internal-container ng-tns-c1691524436-235\">\n<div class=\"animated-opacity ng-tns-c1691524436-235\">\n<pre class=\"ng-tns-c1691524436-235\"><code class=\"code-container formatted ng-tns-c1691524436-235 no-decoration-radius\" role=\"text\" data-test-id=\"code-content\">+---------------------------------------------------------------------------------+\r\n|                       PROTOCOL DE M\u0102SURARE \u00ceN 4 PA\u0218I                            |\r\n+---------------------------------------------------------------------------------+\r\n|                                                                                 |\r\n|  [ Pasul 1: Izolare ] ----&gt; Deconecteaz\u0103 complet difuzorul de la amplificator. |\r\n|  [ Pasul 2: Calibrare ] ---&gt; Seteaz\u0103 multimetrul pe scara minim\u0103 (200 \u03a9).       |\r\n|  [ Pasul 3: Tarare ] ------&gt; Atinge sondele \u00eentre ele pentru a sc\u0103dea eroarea.  |\r\n|  [ Pasul 4: M\u0103surare ] ----&gt; Atinge ferm bornele + \u0219i - ale difuzorului.        |\r\n|                                                                                 |\r\n+---------------------------------------------------------------------------------+\r\n<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<h3 data-path-to-node=\"18\">Pasul 1: Deconectarea complet\u0103<\/h3>\n<p data-path-to-node=\"19\"><b data-path-to-node=\"19\" data-index-in-node=\"0\">Nu efectua\u021bi niciodat\u0103 m\u0103sur\u0103tori c\u00e2nd difuzorul este conectat la amplificator sau la un filtru pasiv (crossover) func\u021bional.<\/b> Tensiunile reziduale pot distruge etajul de intrare al multimetrului, iar componentele pasive (condensatoare, bobine) vor denatura complet citirea.<\/p>\n<h3 data-path-to-node=\"20\">Pasul 2: Seta\u021bi multimetrul digital<\/h3>\n<p data-path-to-node=\"21\">Rotitorul selector trebuie pozi\u021bionat pe zona <b data-path-to-node=\"21\" data-index-in-node=\"46\">\u03a9 (Ohmi)<\/b>, pe cea mai mic\u0103 scar\u0103 disponibil\u0103 (de obicei <b data-path-to-node=\"21\" data-index-in-node=\"101\">200 \u03a9<\/b>). Dac\u0103 folosi\u021bi un <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/ro\/blog\/multimetrul-care-te-salveaza-la-orice-testare\/\">multimetru<\/a> cu scalare automat\u0103 (<i data-path-to-node=\"21\" data-index-in-node=\"158\">Auto-Range<\/i>), asigura\u021bi-v\u0103 c\u0103 simbolul afi\u0219at pe ecran este <b data-path-to-node=\"21\" data-index-in-node=\"217\">\u03a9<\/b> \u0219i nu <b data-path-to-node=\"21\" data-index-in-node=\"225\">k\u03a9<\/b> sau <b data-path-to-node=\"21\" data-index-in-node=\"232\">M\u03a9<\/b>.<\/p>\n<h3 data-path-to-node=\"22\">Pasul 3: M\u0103surarea rezisten\u021bei proprii a cablurilor (Zeroing)<\/h3>\n<p data-path-to-node=\"23\">Atinge\u021bi sondele ro\u0219ie \u0219i neagr\u0103 direct \u00eentre ele. Multimetrul va afi\u0219a o valoare mic\u0103 (de exemplu: <code data-path-to-node=\"23\" data-index-in-node=\"100\">0.2 \u03a9<\/code> sau <code data-path-to-node=\"23\" data-index-in-node=\"110\">0.4 \u03a9<\/code>). Aceasta este rezisten\u021ba intern\u0103 a cablurilor aparatului. <b data-path-to-node=\"23\" data-index-in-node=\"175\">Sc\u0103de\u021bi aceast\u0103 valoare din citirea final\u0103 a difuzorului.<\/b><\/p>\n<h3 data-path-to-node=\"24\">Pasul 4: Preluarea citirii<\/h3>\n<p data-path-to-node=\"25\">Plasa\u021bi sonda ro\u0219ie pe borna pozitiv\u0103 (<code data-path-to-node=\"25\" data-index-in-node=\"39\">+<\/code>) \u0219i sonda neagr\u0103 pe borna negativ\u0103 (<code data-path-to-node=\"25\" data-index-in-node=\"77\">-<\/code>). P\u0103stra\u021bi o ap\u0103sare ferm\u0103 f\u0103r\u0103 a atinge cu degetele goale ambele v\u00e2rfuri ale sondelor (rezisten\u021ba corpului uman poate altera m\u0103sur\u0103toarea).<\/p>\n<h2 data-path-to-node=\"3\">3. Conectarea Difuzoarelor Multiple: Calculul Impedan\u021bei Echivalente<\/h2>\n<p data-path-to-node=\"4\">C\u00e2nd conecta\u021bi mai multe difuzoare la un singur canal de amplificare, trebuie s\u0103 calcula\u021bi sarcina total\u0103 rezultat\u0103 pentru a nu dep\u0103\u0219i limitele amplificatorului.<\/p>\n<div class=\"code-block ng-tns-c1691524436-248 ng-animate-disabled ng-trigger ng-trigger-codeBlockRevealAnimation\" data-hveid=\"0\" data-ved=\"0CAAQhtANahgKEwiJhKnB6uiVAxUAAAAAHQAAAAAQuwQ\">\n<div class=\"formatted-code-block-internal-container ng-tns-c1691524436-248\">\n<div class=\"animated-opacity ng-tns-c1691524436-248\">\n<pre class=\"ng-tns-c1691524436-248\"><code class=\"code-container formatted ng-tns-c1691524436-248 no-decoration-radius\" role=\"text\" data-test-id=\"code-content\">+---------------------------------------------------------------------------------+\r\n|                         CONFIGURA\u021aII DE CONECTARE                               |\r\n+---------------------------------------------------------------------------------+\r\n|                                                                                 |\r\n|  SERIE:     [ + Amplificator ] ---&gt; [ + Boxa 1 - ] ---&gt; [ + Boxa 2 - ] ---&gt; [-] |\r\n|             Z_total = Z1 + Z2                                                   |\r\n|                                                                                 |\r\n|  PARALEL:   [ + Amplificator ] ---&gt; [ + Boxa 1 + ] &amp; [ + Boxa 2 + ]             |\r\n|             [ - Amplificator ] ---&gt; [ - Boxa 1 - ] &amp; [ - Boxa 2 - ]             |\r\n|             Z_total = (Z1 * Z2) \/ (Z1 + Z2)                                     |\r\n|                                                                                 |\r\n+---------------------------------------------------------------------------------+\r\n<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<h4 data-path-to-node=\"6\">A. Conectarea \u00een Serie<\/h4>\n<p data-path-to-node=\"7\">Adaug\u0103 rezisten\u021bele individuale. Este utilizat\u0103 pentru a cre\u0219te impedan\u021ba total\u0103 \u0219i a proteja amplificatorul.<\/p>\n<ul data-path-to-node=\"8\">\n<li>\n<p data-path-to-node=\"8,0,0\"><b data-path-to-node=\"8,0,0\" data-index-in-node=\"0\">Formul\u0103:<\/b> <code data-path-to-node=\"8,0,0\" data-index-in-node=\"9\">Z_total = Z1 + Z2 + ... + Zn<\/code><\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"8,1,0\"><b data-path-to-node=\"8,1,0\" data-index-in-node=\"0\">Exemplu:<\/b> Dou\u0103 difuzoare de <b data-path-to-node=\"8,1,0\" data-index-in-node=\"27\">4 Ohmi<\/b> legate \u00een serie vor oferi o sarcin\u0103 total\u0103 de <b data-path-to-node=\"8,1,0\" data-index-in-node=\"80\">8 Ohmi<\/b>.<\/p>\n<\/li>\n<\/ul>\n<h4 data-path-to-node=\"9\">B. Conectarea \u00een Paralel<\/h4>\n<p data-path-to-node=\"10\">Scade impedan\u021ba total\u0103 \u0219i cre\u0219te curentul absorbit din amplificator.<\/p>\n<ul data-path-to-node=\"11\">\n<li>\n<p data-path-to-node=\"11,0,0\"><b data-path-to-node=\"11,0,0\" data-index-in-node=\"0\">Formul\u0103 (dou\u0103 difuzoare identice):<\/b> <code data-path-to-node=\"11,0,0\" data-index-in-node=\"35\">Z_total = Z \/ n<\/code> (unde <code data-path-to-node=\"11,0,0\" data-index-in-node=\"57\">n<\/code> este num\u0103rul de difuzoare)<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"11,1,0\"><b data-path-to-node=\"11,1,0\" data-index-in-node=\"0\">Formul\u0103 general\u0103 (dou\u0103 difuzoare diferite):<\/b> <code data-path-to-node=\"11,1,0\" data-index-in-node=\"44\">Z_total = (Z1 * Z2) \/ (Z1 + Z2)<\/code><\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"11,2,0\"><b data-path-to-node=\"11,2,0\" data-index-in-node=\"0\">Exemplu:<\/b> Dou\u0103 difuzoare de <b data-path-to-node=\"11,2,0\" data-index-in-node=\"27\">4 Ohmi<\/b> legate \u00een paralel vor crea o sarcin\u0103 de doar <b data-path-to-node=\"11,2,0\" data-index-in-node=\"79\">2 Ohmi<\/b>.<\/p>\n<\/li>\n<\/ul>\n<blockquote data-path-to-node=\"12\">\n<p data-path-to-node=\"12,0\">\u26a0\ufe0f <b data-path-to-node=\"12,0\" data-index-in-node=\"3\">AVERTISMENT DE SIGURAN\u021a\u0102:<\/b> Majoritatea amplificatoarelor auto sau de cas\u0103 conven\u021bionale nu sunt stabile la sarcini mai mici de <b data-path-to-node=\"12,0\" data-index-in-node=\"129\">2 Ohmi<\/b> (sau <b data-path-to-node=\"12,0\" data-index-in-node=\"141\">4 Ohmi<\/b> \u00een punte). Cobor\u00e2rea sub limita specificat\u0103 va activa protec\u021bia de supracurent sau va duce la distrugerea tranzistoarelor finale din cauza supra\u00eenc\u0103lzirii.<\/p>\n<\/blockquote>\n<p data-path-to-node=\"14\">Iar pentru restul ghidului, valorile sunt exprimate simplu:<\/p>\n<ul data-path-to-node=\"15\">\n<li>\n<p data-path-to-node=\"15,0,0\"><b data-path-to-node=\"15,0,0\" data-index-in-node=\"0\">2 Ohmi<\/b>, <b data-path-to-node=\"15,0,0\" data-index-in-node=\"8\">4 Ohmi<\/b>, <b data-path-to-node=\"15,0,0\" data-index-in-node=\"16\">6 Ohmi<\/b>, <b data-path-to-node=\"15,0,0\" data-index-in-node=\"24\">8 Ohmi<\/b><\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"15,1,0\">Rezisten\u021b\u0103 m\u0103surat\u0103: <b data-path-to-node=\"15,1,0\" data-index-in-node=\"21\">3.2 \u2013 3.7 Ohmi<\/b> pentru o box\u0103 de <b data-path-to-node=\"15,1,0\" data-index-in-node=\"53\">4 Ohmi<\/b>.<\/p>\n<\/li>\n<\/ul>\n<h2 data-path-to-node=\"40\">4. Ghid de Diagnosticare: Cum Identifici un Difuzor Defect<\/h2>\n<p data-path-to-node=\"41\">Multimetrul este un instrument excelent pentru a depista starea de s\u0103n\u0103tate mecanic\u0103 \u0219i electric\u0103 a unei bobine mobile:<\/p>\n<div class=\"code-block ng-tns-c1691524436-237 ng-animate-disabled ng-trigger ng-trigger-codeBlockRevealAnimation\" data-hveid=\"0\" data-ved=\"0CAAQhtANahgKEwiJhKnB6uiVAxUAAAAAHQAAAAAQoAQ\">\n<div class=\"formatted-code-block-internal-container ng-tns-c1691524436-237\">\n<div class=\"animated-opacity ng-tns-c1691524436-237\">\n<pre class=\"ng-tns-c1691524436-237\"><code class=\"code-container formatted ng-tns-c1691524436-237 no-decoration-radius\" role=\"text\" data-test-id=\"code-content\">+---------------------------------------------------------------------------------+\r\n|                       TABEL DE DIAGNOSTICARE M\u0102SUR\u0102TORI                         |\r\n+---------------------------------------------------------------------------------+\r\n|                                                                                 |\r\n|  Rezultatul M\u0103sur\u0103torii     Starea Bobinei           Cauza Probabil\u0103            |\r\n|  -----------------------------------------------------------------------------  |\r\n|  * Re = 0.0 - 0.5 \u03a9         Bobin\u0103 \u00een Scurtcircuit  S\u00e2rm\u0103 topit\u0103 \/ izola\u021bie arsa|\r\n|  * Re = Valoare Normal\u0103     Bobin\u0103 Intact\u0103 Electric  Stare Optim\u0103               |\r\n|  * Re = OL \/ Infitit (\u221e)    Bobin\u0103 \u00centrerupt\u0103        S\u00e2rm\u0103 \u00eentrerupt\u0103\/ars\u0103      |\r\n|  * Re Fluctueaz\u0103 La Ap\u0103sare Frecare Mecanic\u0103         S\u00e2rm\u0103 desprins\u0103 de pe corp |\r\n|                                                                                 |\r\n+---------------------------------------------------------------------------------+\r\n<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<h3 data-path-to-node=\"2\">Interpretarea Rezultatelor Anormale:<\/h3>\n<ul data-path-to-node=\"3\">\n<li>\n<p data-path-to-node=\"3,0,0\"><b data-path-to-node=\"3,0,0\" data-index-in-node=\"0\">Afi\u0219aj OL (Over Limit) sau 1 (Infinit):<\/b><\/p>\n<ul data-path-to-node=\"3,0,1\">\n<li>\n<p data-path-to-node=\"3,0,1,0,0\"><b data-path-to-node=\"3,0,1,0,0\" data-index-in-node=\"0\">Semnifica\u021bie:<\/b> Circuit deschis. S\u00e2rm\u0103 din bobina mobil\u0103 s-a \u00eentrerupt complet sau firul flexibil de leg\u0103tur\u0103 (<i data-path-to-node=\"3,0,1,0,0\" data-index-in-node=\"109\">tinsel lead<\/i>) este rupt. Difuzorul este complet nefunc\u021bional.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p data-path-to-node=\"3,1,0\"><b data-path-to-node=\"3,1,0\" data-index-in-node=\"0\">Valoare foarte mic\u0103 (ex. 0.1 \u2013 0.8 Ohmi pe un difuzor nominal de 4 Ohmi):<\/b><\/p>\n<ul data-path-to-node=\"3,1,1\">\n<li>\n<p data-path-to-node=\"3,1,1,0,0\"><b data-path-to-node=\"3,1,1,0,0\" data-index-in-node=\"0\">Semnifica\u021bie:<\/b> Scurtcircuit \u00eentre spire. Izola\u021bia de lac a s\u00e2rmei s-a topit din cauza supra\u00eenc\u0103lzirii, iar curentul ocole\u0219te cea mai mare parte a bobinei.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p data-path-to-node=\"3,2,0\"><b data-path-to-node=\"3,2,0\" data-index-in-node=\"0\">Variabilitate la ap\u0103sarea membranei (Testul <a href=\"https:\/\/diagnozabam.ro\/sfaturi\/ro\/blog\/recenzie-foxwell-nt919-bt-tester-profesional-de-diagnoza\/\">mecanic<\/a>):<\/b><\/p>\n<ul data-path-to-node=\"3,2,1\">\n<li>\n<p data-path-to-node=\"3,2,1,0,0\"><b data-path-to-node=\"3,2,1,0,0\" data-index-in-node=\"0\">Semnifica\u021bie:<\/b> Atinge\u021bi sondele de borne \u0219i ap\u0103sa\u021bi u\u0219or \u0219i simetric pe conul difuzorului. Dac\u0103 valoarea sare haotic (de exemplu: de la 3.5 Ohmi la 20 Ohmi sau OL), bobina freac\u0103 de magnet \u0219i are spire desprinse sau arse par\u021bial.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Cum M\u0103sori Impedan\u021ba unei Boxe cu Multimetrul: Ghid Detaliat \u0219i Rigoare Tehnic\u0103 Procesul de configurare a unui sistem audio \u2014 fie c\u0103 vorbim despre un proiect car audio personalizat, fie despre un sistem home cinema sau o instala\u021bie de sonorizare profesional\u0103 (PA) \u2014 depinde direct de potrivirea corect\u0103 a sarcinilor electrice. O eroare aparent minor\u0103 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":19406,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[1933],"tags":[53081,53075,53079,17977,53077,17964,17791,53073],"class_list":["post-19405","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-auto","tag-amplificator-audio","tag-car-audio","tag-diagnosticare-difuzor","tag-home-audio","tag-impedanta-boxe","tag-masurare-impedanta","tag-multimetru-digital","tag-rezistenta-difuzor"],"yoast_head":"<!-- This site is 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