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#1
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Goofy Rowe R-80 Amp
hi, all-
still fighting the battle of the muddy bass. had the amp gone over, soldering checked, connections cleaned. today when we installed the cleaned up, the right channel sounds great when it's plugged in, the left channel sounds great when IT'S plugged in, but together, the muddy bass is back. we hooked an external turntable into the amp and noticed that there is now an increasing in the volume output, and increasing reverb. this is over the course of maybe ninety seconds. it crossed my mind that maybe, just maybe, this may have something to do with he feature of the "fade in" sound once the tone arm rests on the turntable once a selection is made. any thoughts? thanks- john hayes |
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#2
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You have the speakers out of phase . remove the wires from ONE speaker
and reverse them |
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That brings back memories.... lots of gooey surrounds I've had to deal
with.. Don "KLR" wrote in message ... On 8 Aug 2004 14:52:13 -0700, (John Hayes) wrote: hi, all- still fighting the battle of the muddy bass. had the amp gone over, soldering checked, connections cleaned. today when we installed the cleaned up, the right channel sounds great when it's plugged in, the left channel sounds great when IT'S plugged in, but together, the muddy bass is back. we hooked an external turntable into the amp and noticed that there is now an increasing in the volume output, and increasing reverb. this is over the course of maybe ninety seconds. it crossed my mind that maybe, just maybe, this may have something to do with he feature of the "fade in" sound once the tone arm rests on the turntable once a selection is made. any thoughts? thanks- john hayes I had the same recently on an R-81. Bass was horrible and distorted. Turned out that the edge surround of both bass speakers was totally stuffed (in fact there wasnt any left). Replacing both the woofers made the thing sound fantastic once more. This is the unit before speaker replacement. http://www.geocities.com/kenreed1999/R81Speaker.jpg The reason that the problem isn't happening with one channel only is that the bass is driven across both channels in a "bridge" mode. if one channel isn't connected - then the bass power will be enormously reduced and the muddy effect wont be as bad. The effect of it being loud and adjusting down is indeed due to the AVC adjusting the volume level automatically to keep it constant. If you leave the turntable sit with no record playing - it will turn itself UP and when you then start playing - it will turn progressively down to level things out. When amplifier its unmuted by the machine - the level starts out about midway in order to avoid this problem --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.733 / Virus Database: 487 - Release Date: 8/2/04 |
#5
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The effect of it being loud and adjusting down is indeed due to the AVC adjusting the volume level automatically to keep it constant. If you leave the turntable sit with no record playing - it will turn itself UP and when you then start playing - it will turn progressively down to level things out. so, this happened when the external turntable was engaged to test things out, and in theory should not when the juke turntable is operating? is there any way to adjust the AVC? is this located on the amp? |
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#7
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#8
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Finally - unless you reversed one channel of the cartridge leads on
your external turntable - you are likely to get very little or no bass as this cartridge lead reversal is necessary to make the amp operate in bridge mode to correctly drive the woofer. this is all very useful... but let me go back to the issue of one channel sounding great as long as the other channel isn't engaged. what would be the first order of business here? |
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#10
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What were the results of trying the advice given previously in posts by "Ken G" and myself ? i'll try this out and get back in touch. many thanks- j |
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