Question about Lexicon LX-7 7-Channel Amplifier

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Lexicon Lx-7 buzz sound

I have a LX-7 amplifier wich present a subtle buzz sound through each one of the seven channels even do there is no input signal just the speakers cable were connected. Can somebody help me...?

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Hi chupetin2

If the problem is present with ONLY the speakers connected, that is no other powered devices like subs, or input/output cables, it will be a power supply problem inside the amp. If you have electronic fault finding skills, there will probably be a capacitor in a regulated rail that has failed.
If you do have a sub connected, be sure it is powered from the same mains source as the amp, or at least a GPO that is on the same phase. Different phases will induce mains hum, as will multiple earths. Try also temporarily moving the amp(whilst monitoring the hum) from where it is sitting and see if the hum is being induced into the amp by any other devices

Happy to talk to you more about this. Just ask:)

regards
robotek

Posted on Aug 19, 2008

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2 Answers

What causes buzzing in speakers?


There are many causes of buzz, so it should be checked step by step :
- Bad connection on the input connector, or cord.
- Amplifier, basically have the block diagram like this:
25850676-l1qpqmriditabltrjczr2eku-5-0.jpg If in one block damage, buzz can be heard.In the amplifier.
Generally occurs in the PSU and / or power amplifiers.
Fix it to the experts,because it requires a good knowledge of electronics.
Blown speaker cone, does not cause a buzz.
Short circuit along the wires supplying the audio, it will not cause any sound in the speakers, including the sound of music.
Try also, disconnect the input connector, whether the buzz is still audible. If after the input connector is removed, the buzz disappears, the possibility of buzz came from another device before the amplifier.

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3 Answers

What would cause a buzz in speakers?


There are many causes of buzz, so it should be checked step by step :
- Bad connection on the input connector, or cord.
- Amplifier, basically have the block diagram like this. View image.25850665-l1qpqmriditabltrjczr2eku-2-0.jpg
If in one block damage, buzz can be heard.In the amplifier.
Generally occurs in the PSU and / or power amplifiers.
Fix it to the experts,because it requires a good knowledge of electronics.
Blown speaker cone, does not cause a buzz.
Short circuit along the wires supplying the audio, it will not cause any sound in the speakers, including the sound of music.
Try also, disconnect the input connector, whether the buzz is still audible. If after the input connector is removed, the buzz disappears, the possibility of buzz came from another device before the amplifier.

Sep 05, 2015 | Behringer Xenyx 1202 12-input 2-bus Mixer...

1 Answer

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Let me know if you need any clarification on this.

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Try turning down the external speaker volume, then bump up the sound card volume. You'll probably need to adjust the other inputs individually (Wave, Mic, CD, etc) so that none is too loud or soft. Once the input values have been set, gradually increase the output of the sound card in the control panel application etc. while decreasing the volume on the amplified speaker to maintain a comfortable level. Eventually, you'll find the correct volume level on the sound card output that will wake up the Gamer 2 Amp.

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I am using a Lexicon CX-7 Power Amplifier in conjunction with a Lexicon MV-5 Processor. I have 7 B&W Speakers (2 Fronts, 2 Sides, 2 Rears and one Center). I also have a REL Stentor III subwoofer....


I assume you're wrestling with the choice of using its onboard amp fed by the MV-5 or driving it from the CX-7's unused channel.

Of course either way will work. I'd go with the preamp-to-REL method as the REL engineers undoubtedly gave some thought to the amp design for the price paid.

Attach it to the Sub1 Preamp out

http://www.retrevo.com/support/Lexicon-MV-5-Receivers-manual/id/22990ci271/t/2/

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