bridge ouput rca possible ?

[Ground Zero]

hello

I have a soundstream reference 500S and when i bridge the amp to mono for my subwoofer, there is only one rca can be use
Soundstream say that we can only use right channel has input in bridged mode.

so my question is

i have a pionneer dehp1500ub and have 2 output rca

is it possible to bridge the 2 output rca to put the signal in the only right channel of the soundstream?

I think to use this for bridge the signal

Doubleur RCA mâle / 2 x RCA femelle, souple par touslescables.com

but can you tell me please if there is a risk to blow my pioneer dehp1500ub?

thanks in advance

 

[Perry Babin]

There's no need to use both sub outputs. The sub output is virtually always a mono signal.

 

[Ground Zero]

Thanks Perry

Yes you right i'have tested my adaptator and i haven't more power so i'll only use one rca output .

But i don't know why my soundstream reference 500S hasn't enough power for my subwoofer.

at 2 ohms it can power 500Watts rms and my sub don't move a lot and i can't hear a lot of bass

and it's the same things in stereo mode who can power 2x75 wrms @ 4ohms on my speaker in front door of my cars

but with my rockford punch 200.4 who can only do 2x50wrms @ 4 ohms in bridged mode have a lot of power

it's really strange the soundstream is more powerfull and the rockford have less power but he drive speaker with a lot of power

If you have an idea of the problem ?
Thanks a lot

 

[Perry Babin]

Do you have the input voltage switch set to the 200mv setting?

 

[Ground Zero]

yes when i set 2mv to 2v i have a little more power "not enough" but it's not the good setting ?
because my radio go to 4V at rca output

so i must set the soundstream to 0.2v to 5V isn't it ?

 

[Perry Babin]

Do the gain controls on your amp have the same range of rotation as the other controls?

 

[Ground Zero]

yes i confirm

i don't know what is the problem

 

[Perry Babin]

With the crossover set to full range and the gains at the maximum setting, drive a 100Hz sine wave signal into the amp and measure the AC voltage on the speaker outputs (meter probes directly across the speaker terminals. Drive it up to as loud as you can (assuming that the gain is so low that you can't drive it into clipping). Then measure the AC voltage on the RCA jacks. Place one probe on the RCA shield and the other on the center conductor on the back of the jack inside the amp. Post both voltages.

 

[Ground Zero]

i use the soundstream to replace the sinuslive amp and on with the sinuslive it works so the rca output level on the radio is ok.

and if i use the soundstream amp in my house with a powersupply the power is really good and not in my car ??

 

[Ground Zero]

the crossover is already set to full because i use crossover of the radio

i'll do your test and i'll post it

 

[Ground Zero]

for the test i must do it with the subwoofer connected?

 

[Perry Babin]

The subwoofer doesn't need to be connected.

While you're measuring the voltages, measure the DC voltage on the center legs of the output transistors. Don't slip and short between the legs of the transistors. Measure the voltage on the TIP102 and TIP107.

 

[Ground Zero]

Thanks Perry

But can i do that in my home ? because it will be more simple for me to unmount the amp and test the voltage on it

and can i use my sound card on my computer to send the 100hertz signal ino the input rca of the amp?

Thanks for your help

 

[Ground Zero]

Have you got Perry the shematics circuit for the soundstream reference 500S please?

Thanks

 

[Perry Babin]

It can be done anywhere that you can power it up.

 

[Ground Zero]

Ok Thanks Perry

I'll do that this week-end because i work tomorrow and i have no time
I hope i'll can test the amp saturday

 

[Ground Zero]

With the crossover set to full range and the gains at the maximum setting, drive a 100Hz sine wave signal into the amp and measure the AC voltage on the speaker outputs (meter probes directly across the speaker terminals. Drive it up to as loud as you can (assuming that the gain is so low that you can't drive it into clipping). Then measure the AC voltage on the RCA jacks. Place one probe on the RCA shield and the other on the center conductor on the back of the jack inside the amp. Post both voltages.

Hello Perry

That's my result the amp soundstream reference 500S are in a power supply regulated 13.8vdc at 12A and the rca are from my soundcard of my pc i use a tone generator and my soundcard is an emu1212mv2 pci

with the volume of my pc to the max i have at 100hz sinus 29vac on the speaker terminal in bridged mode and i have 358mvac on the rca

The result is good for you ?

Now for the dc voltage where i must put the black wire of my multimeter please?

Thanks

 

[Perry Babin]

You can place the black probe on the ground terminal of the amp.

The voltages you posted seem to indicate that the amp is working properly.

 

[Ground Zero]

Thanks Perry

so do you it's necessary to test dc voltage on the output transistors ?

I do the test i prefer to be sure....


the red wire of my multimeter is on the center legs of one output transistor and the black meter on ground teminal supply

this is the result:
transistors: Q24,Q25,Q26,Q27: 37.3vdc
transistors: Q28,Q29,Q30,Q31: -37,1vdc
transistors: Q10,Q11,Q12,Q13 37.3vdc
transistors: Q14,Q15,Q16,Q17 -37.1vdc


I don't where are Tip102 And Tip 107
have you gor the "Q" number please and for the measurement, i'll do the same things like output transistor?

thanks

 

[Perry Babin]

I don't have much information on that amp but those are likely the outputs. Is the -31.7 supposed to be -37?

If so, I don't see anything wrong with the amp. I'm assuming that that's the correct rail voltage for this amp. If it's not, someone should post the correct voltage.

The AC voltages you posted earlier seem to indicate that you were driving it to hard clipping so I don't think there's a problem of low gain.