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Date:         Wed, 27 Aug 1997 17:53:24 -0400
Sender:       Vanagon Mailing List <vanagon@vanagon.com>
From:         Gary Mceachern <gmceachern@MEDIAONE.NET>
Subject:      Re: Stereo Wiring

Chris

Your troubleshooting and logic is fine a sfar as you've gone. I would suggest trying at least one more test before deciding it's the amp causing the buzzing. Reverse the LF and RF speaker wires at the amp. If the RF speaker now buzzes and the LF doesn't, it's a safe bet the amp is the culprit. If the LF speaker still buzzes you either got another bad speaker or the speaker wiring or mounting is at fault. If the speaker is bad (possible but not probable), reversing the LF and RF speaker should cause the buzzing to follow the speaker. Make sure there isn't anything obstructing or pushing into the back of the speaker.

A few questions/comments: Is the the buzzing occurring at all listening levels? 1.) If it only happens at higher listening levels, is the LF speaker getting more signal than the RF? (amplifier gain control or balance control will affect this). Make sure you are not simply applying too much power to the speaker. Sit and listen with your head in the middle between the speakers to determine this. More power may be being directed to the LF speaker because the drivers listening position is so far off axis from it.

2.)If you get this buzzing with the volume all the way down (off) the buzz may be the result of a grounding problem. If this is the case it is most likely present on both speakers. Maybee just a little louder on the LF side? Check for bad or unintentional grounds on all system components. Speaker wiring generally should not be grouned to the chassis.

Are you boosting the bass control? This may significantly reduce the maximum undistorted playing level and increase the possibility of buzzing. Keep in mind the 4" speaker doesn't produce bass efficiently. If you don't have a "high pass" crossover blocking the deep bass from getting to this speaker it may buzz particularly when played at higher levels.

Gary

---------------------------------------------------------------------- I have a question regarding the wiring of my stereo. I recently installed an after market Sony CD Head Unit, Boston Acoustic 4" speakers, Sub-Woofer and an Amplifier. Wired everything up and it sounded great for a month. The other day one of the speakers started buzzing! Pulled the speaker and exchanged it for a new one. New speaker also buzzed.

Checked the connections at the amplifier and visually everything seemed fine. There are two coax cables that come from the head unit. Cable A (Left Front Amp In) and Cable B (Right Front Amp In). If I unplug Cable A, LF speaker stops working and RF speaker plays beautifully. If unplug Cable B, RF speaker plays and LF speaker plays and it buzzes.

If I take Cable A and plug it into the RF Amp In, RF speaker plays beautifully. So I deduce that the signal reaching the Amp is OK....am I correct? The fact that both RF and LF play when only one signal is being sent to LF Amp In leads me to believe there is a bad ground? Am I close? I tried grounding the Amp body but nothing happened! What could cause this?

I am a Financial Analyst, are there any electrical engineering types out there that could help me? If my reasoning is sound I'll just return the Amp and tell them about the ground leak. However, I don't want to be laughed out of Magnolia Hi-Fi when I bring in my Amp.

Thanks in Advance of any Advice!

Chris P. Seattle, WA '89 Oil Burning Jetta "Jake" '87 Wasserboxer GL "Lewis" '82 Oil Burning L "Billie Rae"


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