JBL Sub high level input only

Dr Moreaux · 20th April 2007, 06:16 AM

Hi i just bought a secondhand JBL TLX CSS-SUB1 off Ebay and have discovered that it has high levl in only, is there an easy way to change that to accept a low level input from the sub out of my Denon AVR 3300?, or should i jus solder a couple of RCA's onto the board from where it looks like a socket should be for a different model.

mikee55 · 20th April 2007, 05:00 PM

Just use the high level, if you use low level, you won't create enough drive to drive the thing. You need to obtain the circuit diagram, or maybe you could try and connect an RCA into the volume pot. I'm not familiar with your sub and assume its got its own amp(Active)? If you take the case apart, locate the volume pot, usualy a pot has three legs(mono , 6 stereo), one in one out and one ground. Usually middle contains signal either in or out with one of the others being ground and in out.
Make sense?

Cheers Mike

Dr Moreaux · 21st April 2007, 12:18 AM

i was thinking something like that mike, yes it is active , i really only want to use it for home cinema and not hifi which is why i want line level input via my sub out on the amp,could i possibly impedance match it by using a transformewr passively?

Foxx510 · 21st April 2007, 02:19 AM

I'm sure if you post some good photos of the circuit board some of the brains here could work out where a line level input could go. As you say it might just be a matter of soldering in the RCA sockets.

mikee55 · 21st April 2007, 09:28 PM

The input would be 2 resistors right at the input socket. Possibly one pair would be large in diameter suggesting high power handling, I had this on a car amp, the other pair normal size.
Get some pics to us.

Cheers Mike

Dr Moreaux · 22nd April 2007, 03:04 AM

ta everyone i'll take photos tonight and post them monday morning aussie time

20th April 2007, 06:16 AM	#1
Dr Moreaux diyAudio Member Join Date: Apr 2007	JBL Sub high level input only Hi i just bought a secondhand JBL TLX CSS-SUB1 off Ebay and have discovered that it has high levl in only, is there an easy way to change that to accept a low level input from the sub out of my Denon AVR 3300?, or should i jus solder a couple of RCA's onto the board from where it looks like a socket should be for a different model.

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21st April 2007, 12:18 AM	#3
Dr Moreaux diyAudio Member Join Date: Apr 2007	i was thinking something like that mike, yes it is active , i really only want to use it for home cinema and not hifi which is why i want line level input via my sub out on the amp,could i possibly impedance match it by using a transformewr passively?

21st April 2007, 02:19 AM	#4
Foxx510 diyAudio Member Join Date: Nov 2006	I'm sure if you post some good photos of the circuit board some of the brains here could work out where a line level input could go. As you say it might just be a matter of soldering in the RCA sockets.

22nd April 2007, 03:04 AM	#6
Dr Moreaux diyAudio Member Join Date: Apr 2007	ta everyone i'll take photos tonight and post them monday morning aussie time

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