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Old 3rd June 2014, 09:34 AM   #1
gavi101 is offline gavi101  New Zealand
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Default Technics sux320 amp low tinny bass

Hi all

Hoping you can help or advise.
I have a technics sux320 set (amp,speakers,tuner,cd,tape deck,equaliser).

Having a strange issue with the amp and speakers. When the amp's balance knob is centred the bass from the speakers lack depth and sounds tinny when loud .... BUT when I move the Balace knob full left the bass comes hard and speaker sounds louder and when I move it back to center it's lacks bass and tinny AND when move balance full right again the bass is hard and speaker is loud but move it back to center it looses bass ;(

I have checked the speaker connections in the back and it's all correct.
Hope someone can help or shed some light.

Thnx
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Old 3rd June 2014, 04:03 PM   #2
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Reverse the polarity on one of the speaker outs. Leave the other channel alone and see if it gets worse or better.
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Old 3rd June 2014, 04:44 PM   #3
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See if the speakers need new foam surrounds or if the woofers are seized up. Did your speaker get dropped of knocked over (it can shift the magnet on the woofer). Also check the amp controls...
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Old 4th June 2014, 08:09 AM   #4
gavi101 is offline gavi101  New Zealand
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Why Guys

Thanks for the replies

ill try reversing the polarity and see what happens.

No damage ...speaker cones/foam etc all fine and didn't dropped them as far as I know off.
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Old 4th June 2014, 02:37 PM   #5
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Might be a power supply problem too. Like it has enough power for one channel only but it drops out when two channels are on it. Looks like it is a fairly old receiver. Might be time to download the service manual and open her up. Check voltages from power supply.
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Old 4th June 2014, 07:05 PM   #6
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Most obvious is speakers out of phase, as already suggested.
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Old 9th June 2014, 03:32 AM   #7
gavi101 is offline gavi101  New Zealand
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Hi Guys looks like you guys were correct it was out of phase.

Seems someone in my house hold may have kicked the wire of the push terminals on the speaker end (Left) and connected them incorrectly.
Unfortunately during my troubleshooting I was focused on the amp being the issue than the speakers (my bad) and didn't check the speaker push terminals.

Thanks all
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