Help to make car audio test

[kazzalite]

Dear all,

I want to ask for help, I want to create a table to test car audio in my workplace. now I have to check one by one, then I have an idea to test 4 units in ones of car audio, but do not know how ?
4 units of the car's audio output is connected only to the 4 speakers plus a woofer.

Please help, and I greatly appreciate your assistance.

Thanks for helping me.

 

[srizbf]

testing car audio means , it can be just go/nogo test.
frequency response test, power output test etc.

by 'test' which test you mean ?
can you give some more details?

the forum member , especially 'audioguru ' may give valuable advice.

 

[kazzalite]

testing car audio means , it can be just go/nogo test.
frequency response test, power output test etc.

by 'test' which test you mean ?
can you give some more details?

the forum member , especially 'audioguru ' may give valuable advice.

Thank you for ur quick replay.

Test means, just to test that unit is working for audio output when playing DVD, MP3, or input iPOD in that units.

 

[srizbf]

then this what i understood. i may be wrong.

make a cable set-up to connect to the 'DUT'
one for power supply and one set for speakers .
so that you can quickly connect and disconnect the DUT for testing .

if the test involves many units , then a power meter can be substituted instead of speakers.

how many numbers of units to be tested per session ?

or is it enough that if you play a song through respective media that it souns is enough ? or you want to test the fidelity ?

may be , as said , i was not able to get the full requirements of your setup.

 

[kazzalite]

then this what i understood. i may be wrong.

make a cable set-up to connect to the 'DUT'
one for power supply and one set for speakers .
so that you can quickly connect and disconnect the DUT for testing .

if the test involves many units , then a power meter can be substituted instead of speakers.

how many numbers of units to be tested per session ?

or is it enough that if you play a song through respective media that it souns is enough ? or you want to test the fidelity ?

may be , as said , i was not able to get the full requirements of your setup.

Dear srizbf,

I want to make output from 4 unit car audio to only 4 speaker output in one times.
Each units has 4 speaker output, 2 front and 2 rear speakers.
Now i want to make 4 units output to only 4 speakers, instead of 16 speakers.

 

[srizbf]

that means you want to connect all 4 units' output to one set of 4 speakers at the 'same time'
and play all units with one set of 4 speakers?

 

[kazzalite]

that means you want to connect all 4 units' output to one set of 4 speakers at the 'same time'
and play all units with one set of 4 speakers?

yess bro, sorry for my english

 

[srizbf]

so here again:
have one set of 4 speakers.
one possibility:connect one unit output to speaker and test.
connect second unit output to the same speakers and test . and ...

is it ok ?

or connect all units output(corresponding ones ) parallely to speakers and want to test all 4 units at the 'same time'?

 

[kazzalite]

so here again:
have one set of 4 speakers.
one possibility:connect one unit output to speaker and test.
connect second unit output to the same speakers and test . and ...

is it ok ?

or connect all units output(corresponding ones ) parallely to speakers and want to test all 4 units at the 'same time'?

i want to test all 4 units at the same times, and output only 4 speaker + 1 woofer.

i tried to make parallel, but no output sound.

 

[srizbf]

paralleling of all units output at the same time to one speaker set is not feasible .
power involved is high . and therefore 'test one unit at a time' is the recommended one .
to ease the test , make speaker connection through a switch in the outupt of units to speakers .
sounds right ?

 

[kazzalite]

paralleling of all units output at the same time to one speaker set is not feasible .
power involved is high . and therefore 'test one unit at a time' is the recommended one .
to ease the test , make speaker connection through a switch in the outupt of units to speakers .
sounds right ?

how to make switch in the output unit ? did u have a picture for this ?

i tried this https://www.epanorama.net/circuits/linemixer.html but not working.

 

[srizbf]

probably you put the switch thinking logically that "because as a mixer mix more than one signal to one output , speakers output can also be "mixed" ' ?

 

[kazzalite]

probably you put the switch thinking logically that "because as a mixer mix more than one signal to one output , speakers output can also be "mixed" ' ?

yea, mix sound no problem, i can make mute from other units.

how to make simple mixer and working ?

 

[srizbf]

not possible to mix in 'speaker' output.

a conventional 'mixer ' operates at low signal level and impedance matching is also taken care of .

but 'speaker ' mixing impedance matching ' is not feasible .
moreover , due to high power level ' power flow from one unit to other unit may also be a problem.

so drop mixing at speaker level idea .

have a simple switch as said earlier.

 

[kazzalite]

not possible to mix in 'speaker' output.

a conventional 'mixer ' operates at low signal level and impedance matching is also taken care of .

but 'speaker ' mixing impedance matching ' is not feasible .
moreover , due to high power level ' power flow from one unit to other unit may also be a problem.

so drop mixing at speaker level idea .

have a simple switch as said earlier.

did you have some picture for simple switch, really i am not familiar in electronics.

thank you for your helpfully.

 

[srizbf]

since it takes some time to draw the switch diagram , i will post it afterwards .

 

[kazzalite]

since it takes some time to draw the switch diagram , i will post it afterwards .

really, I greatly appreciate your assistance.

 

[srizbf]

in your car audio amplifier , can you give the details of , how many speaker connection terminals are available ?

 

[kazzalite]

in your car audio amplifier , can you give the details of , how many speaker connection terminals are available ?

output speaker connection are 8 terminals :

(F/RH +)
(F/RH -)
(F/LH + )
(F/LH - )

(R/RH +)
(R/RH -)
(R/LH + )
(R/LH - )

Thank you.

 

[srizbf]

a sample wiring is attached for your reference.

it shows one wiring scheme.
for example ,
amp1out is F/RH+ of amp1 ,
amp2out is F/RH+ of amp2 etc.
and 'to speaker teerminal ' is the corresponding speaker terminal.

repeat it for other outputs like ,
amp1out --> F?RH- etc for the next set.


for this total wiring , you require an 8 pole 4 way switch.