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Klh powered sub woofer

What are the low level plug ins for?...these are rca pin plugs

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Low level inputs are designed to take signals directly from an amplifier's "sub out" connections. That way the KLH amplifier will use those signals to produce sound and the volume can be balanced between the main amplifier and the sub amplifier using the sub's volume controls. Depending on your amplifier and sub, that is the best way to connect them. However, be careful running the RCA cables since the low levels are more subject to interference. Keep the runs as short as possible and use high quality shielded cables for the interconnects.

Posted on Aug 26, 2014

  • m_mendon Aug 26, 2014

    Low level inputs are designed to take signals directly from an amplifier's "sub out" connections. That way the KLH amplifier will use those signals to produce sound and the volume can be balanced between the main amplifier and the sub amplifier using the sub's volume controls. Depending on your amplifier and sub, that is the best way to connect them. However, be careful running the RCA cables since the low levels are more subject to interference. Keep the runs as short as possible and use high quality shielded cables for the interconnects.

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Posted on Jan 02, 2017

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SOURCE: sub woofer produces a very loud low tone

I have the same problem. JavaMan is right. In one case someone even reported the bridge rectifier had failed. I have mine apart right now, trying to decide whether to attempt to fix it. The power board has been warped a little from the heat, and I can no longer read the color bands correctly on the power resistors to try to change them. Thanks for the schematics, JavaMan; unfortunately they don't match my boards, so I'm out of luck, and can't find anything else.

The components aren't expensive, so you might be able to take it someplace and have it repaired (or have a friend do it) fairly cheaply if the schematics here match your sub. I think I'm gonna chuck mine, which I hate to do since the speaker and cabinet are still good. I've just wasted too much time on it, and already have another in its place.

Posted on Feb 07, 2010

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Yes, the 10-120 can use a L & R low level subwoofer input. You can get a short 6" RCA splitter adapter from Radio Shack for a under $10. (1 female input, 2 male outputs) Alternately, just plug the subwoofer output on your receiver to just the low level R channel on the KLH sub.

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if you have your front and centers set to 'small' you want your Bass out to be subwoofer only, and the rca jack labeled 'sub out' is the only place to connect your sub to if you want to control the frequencies with your reciever. I dont know the brand of your sub, or the inputs on the back of it to advise you where to connect, but it sounds like it worked for you at one time, but suddenly it does not

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I have a JBL TLX CSS-SUB1 sub at the back are where you connect the speaker wires to the receiver but i don't know witch wire goes in what? i have no clue


The connection on the receiver would be the sub woofer out. Not a sub woofer out LFE, a sub woofer out with speaker wire connection. From there you plug it in to the top section of the available terminals on the sub you are referring to (speaker level input). One in positive and the other in negative matching what you did on the receiver with correct ends. The speaker connections underneath the top connections is for additional speakers like surrounds to be able to be connected directly to the sub woofer speaker level out for sound. This of course would be for an older receiver connection. I do not think it is possible to convert this connection to an LFE and have it work properly. If the receiver does not have sub woofer speaker connection and only a RCA out then you can try to connect both rear speaker connections from the receiver to the speaker level inputs on the sub and then connect your rear speakers to the speaker level output on the sub to power them. This is an active sub woofer but for some reason they made it connect as if it was passive. I am not sure if this sub is designed for really low frequencies required for movie or if it is better for music.

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I been having a problem with my JBL TLX CSS-SUB1, I don't have the manual. Connecting speaker wires from the JBL TLX CSS-SUB1 to the a Digital Audio/Video Control Center ( it's a reciever) I confused,...


The connection on the receiver would be the sub woofer out. Not a sub woofer out LFE, a sub woofer out with speaker wire connection. From there you plug it in to the top section of the available terminals on the sub you are referring to (speaker level input). One in positive and the other in negative matching what you did on the receiver with correct ends. The speaker connections underneath the top connections is for additional speakers like surrounds to be able to be connected directly to the sub woofer speaker level out for sound. This of course would be for an older receiver connection. I do not think it is possible to convert this connection to an LFE and have it work properly. If the receiver does not have sub woofer speaker connection and only a RCA out then you can try to connect both rear speaker connections from the receiver to the speaker level inputs on the sub and then connect your rear speakers to the speaker level output on the sub to power them. This is an active sub woofer but for some reason they made it connect as if it was passive. I am not sure if this sub is designed for really low frequencies required for movie or if it is better for music.

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1 Answer

I have a KLH SW-90 amp. When I plug in the RCA plugs I don't get any sound to the Satelight speakers. Is this a sub amp? Do I need to hook up the high input wires to make the satelight speakers work?


I have the same amp. there a two ways to use it: The phono plug inputs are low level, are for use as an amplifier only, and their only output is the subwoofer output. In this case, any stereo satellite speakers would be driven directly from your stereo amp.
The high level inputs are meant to be driven as the same as speakers from your stereo amp. A circuit inside samples the bass and directs it to the sub amp and output. this same circut passes unamplified outputs to the satellite outputs. PM me at moestevens@cox.net if you need further info.

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1 Answer

My KLH subwoofer (model ASW8-120B) has stopped working and emits only a low-pitched hum.. I have tried hooking it up using the ''high-level'' 2-wire inputs as well as the ''low level'' RCA plug inputs....


It's unlikely that you can find a shop to repair it for less than the replacement cost ($75ish for a comparable KLH or Sony sub)

If you're up for doing your own soldering, here's a solution for the same problem with the same amp.

If this helps, please hit the "thumbs up" for me!

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You are trying to connect the powered sub output of the receiver to a standard (unpowered) subwoofer. Can't be done.

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You can y out from the main out to the sub.This output is post volume control. set level on sub to desired balance of lows feq to highs

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My klh subwoofer has R&L connections to speaker and R&L connections to amplifier, but my new amp has a RCA cable connection plug-in. Any way I can use the old subwoofer with the new system?


Yes, you use a subwoofer cable and hook it into the mono rca jack in the back of the sub. or you can use a Y splitter 1 female to 2 males. or if your amp has 2 sub outputs (L&R) then use both. I do believe it's said that if you use the high level input, it's better. I forgot why...

Oh yeah. the difference between the 2 is a high level input allows the currant from the amp to pass through the sub, thus allowing the continuation of wattage to your other speakers.
Low level input is only taking a audio signal from the amp. No power is being sen through the connection.

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1 Answer

Salvage Job


This should not be a problem. Cut off the plug off the wire oppisite the sub connection. Turn on the sub and touch each wire till you hear a buzz, that should be your source wire. Connect up an RCA plug with the ground of course, and you should be set. Good Luck

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