Hi!
I have 8 subwoofers amplifiers that need a subwoofer signal. I have a 5.1 decoder that outputs 2.2V signal. How can I make it from 1 out to 8 in.
Thanks
//Rian
I have 8 subwoofers amplifiers that need a subwoofer signal. I have a 5.1 decoder that outputs 2.2V signal. How can I make it from 1 out to 8 in.
Thanks
//Rian
Just like that, wire 9 RCA jacks in parallel per channel (1 IN, 8 OUT)
Problem is: can source drive 8 amp inputs in parallel?
Check input impedance and divide by 8.
If not, you´ll need to add a buffer.
Problem is: can source drive 8 amp inputs in parallel?
Check input impedance and divide by 8.
If not, you´ll need to add a buffer.
Maybe, but WHICH amps are we talking about?
Brand - Model - did you search for user manual or datasheet?
Brand - Model - did you search for user manual or datasheet?
Emm... Logitech Z-2300. The subwoofer line in on the vga connector. I have 8 of these systems and what to play all at once.
Here's how to daisy chain subs using RCA splitters: https://www.bing.com/videos/search?...FACD07EE17CEF78EFF3EFAC&view=detail&FORM=VIRE
Thanks.
Searched all over the place , found a couple User manuals, but none states input impedance ¿¿¿???
Just some out-of-the-box thinking, and in no particular order:
* amp uses 4 x TDA729x amps, two for satellites (arndn 60W RMS each) , two bridged for woofer (around 120W RMS each).
Very much doubt they are straight connected to input jack, so their input impedance is irrelevant.
* it also uses 2 or 4 RC455x which I think work as crossovers and input conditioning ... input impedance can be anything between, say, 10k and 100k , designer´s choice, but a common input impedance chosen is around 22k , simply because it´s "middle of the road", easy to get and easy to drive.
Would never expect anything below 10k, simply because there is no reason or need for that.
So IF we connect 8 x 22k inputs in parallel (what I guess you have there), we reach a total of 2k7 combined input impedance.
On the lowish side, but most modern preamps or crossovers can drive that.
Not with ample headroom , but not straining either.
So my suggestion is: wire all those 9 jacks in parallel (1 IN, 8 OUT) and give it a try; I expect no magic smoke at all, absolute worst case insufficient drive or too low a load might make signal source clip, but it find that unlikely.
Only problem might be some wall rattling or light fixtures falling, with 8 x 120W subwoofers driven hard 😉
You test them and comment results 🙂
This search made me find the very interesting Tang Band W8 670Q drivers with enough data provided that I am itching to build a few clones, go figure.
Ok thanks!
So no smoke or anything that fancy?
This W8-670 series is very interesting because I bought the Logitech Z-2300 for 20$ each. So it's very very very cheap. And Logitech first started using this driver in 2004 I think in the Z-2300 and they are still using it in the Z-906 today.
That only works if the impedance/resistance is equal if not the formula is 1/RTotal = 1/R1+1/R2......1/Rx
But wait if you wire them i parallel wouldn't that lower the impedance and short out the output.
I'm not very good with signal cables.
How do I wire in a volume control?
Potentiometer?
Ok.
You don´t actually need one; control volume from your decoder or any signal source you use to drive those subwoofers .
You don´t actually need one; control volume from your decoder or any signal source you use to drive those subwoofers .
Don't think it has a volume control for the individual outputs. It's one of these in the images.
Attachments
Ok, no physical volume potentiometer for any of the outputs, but don´t you have one built in the software?
I think you should, please check that.
In any case, IF you want to add a volume pot to your 1>8 passive splitter box, you will need to add a buffer.
Decoder box (of which you should have posted brand - name - specs or link to user manual from day 1 if you want good answers) can probably (I must guess because you did not supply any data) drive 8 subwoofers, it "should" be able to drive a 2k or higher load , but f you introduce a passive pot in the equation it does not work any more, hence the need for a buffer.
Basic connection would be IN RCA > Buffer board > 8 x RCA Out.
Can you build a small PCB with, say, 10 components?
You will also need to feed that buffer with some kind of supply.
What do you use to feed the decoder?
Any technical answer requires data.
I think you should, please check that.
In any case, IF you want to add a volume pot to your 1>8 passive splitter box, you will need to add a buffer.
Decoder box (of which you should have posted brand - name - specs or link to user manual from day 1 if you want good answers) can probably (I must guess because you did not supply any data) drive 8 subwoofers, it "should" be able to drive a 2k or higher load , but f you introduce a passive pot in the equation it does not work any more, hence the need for a buffer.
Basic connection would be IN RCA > Buffer board > 8 x RCA Out.
Can you build a small PCB with, say, 10 components?
You will also need to feed that buffer with some kind of supply.
What do you use to feed the decoder?
Any technical answer requires data.
