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Sansui R70 Both channels have no bass or midrange. Headphones work fine. Caps bogus?

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Possibly speakers bogus. Have you eliminated them as the cause?

Posted on Aug 05, 2010

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Posted on Jan 02, 2017

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I just connected two sets of 901'a to Sansui G901 receiver. The sound is TINNY no bass at all. I've tried different connections and nothing seems to work. I've used two different EQ from bosse series


Either there is NO bass on the recordings (if you listen to it with headphones does it have bass?) ...OR...you've wired them out of phase. Connect only one(1) Bose 901's to just one side. Is there bass? Then connect the other side. IS there bass? If not reverse the phase (+ /- connections) and see if the bass comes back. Once that is done and there is BASS, then add the 3rd and then the 4th speaker. .Are you sure your Sansui can handle a lower than 4 ohm load???

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1 Answer

Turn down mega bass


test the amplifier.God bless you
t is overheating due to power issues. Check your power ratings to be sure they match the amplifier's specifications. There is a problem with the amplifier. If the power ratings are correct, the amplifier needs to be sent to a service center.

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1 Answer

I don't understand how to use the 'tone' controls


Watch vidoes on "mixer setup". Don't worry if they are not your exact model as the principles are essentially the same among the various types. EQ controls for the channels are "flat" when they are all set to 1 o'clock. The lower one reduces or boosts the bass, the next the midrange and the high the trebles. SOme have a midrange EQ frequency which adjusts the cnterpoint of the midrange frequency. Leave this at 12 o'clock until you get familiar with the rest if your unit happens to have that extra control.

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1 Answer

Both channels of receiver have lost all bass. Loudness control has no effect whatsoever. All inputs affected and rest of receiver functions are ok.


Are you sure there IS bass? Or did you blow both woofers? Try headphones. Without a model number and more details (including the speakers) we can't do much more than guess.

Aug 04, 2010 | Sansui Audio Players & Recorders

1 Answer

I'm buiding a subwoofer box. i have 2-12


Well, good luck sir. Your'e going to have a lot of cancellation and possibly some blown speakers out of al of this unless you actually build a box around the back of all of the speakers. the subs are fine but there will be issues with the speakers. Either way figure out your own loads of all and have 1 2 channel amp for the speakers or multi channel for the speakers and a mono for the subs.

May 22, 2010 | Car Audio & Video

1 Answer

Protect led flashing with hit of bass


Try a bigger amp. This one wants to be turned down. But seriously the protect can act like sort of a clipping device when the unit is trying to amplify out of a certain range. The transistors may be getting weak and need to be replaced. That said I would move this amp to the midrange or the highs and get a little bigger amp for you low low's. Hope that helps.

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1 Answer

Perfect ten bass amp, guitar


can you use headphones? if so do they sound normal. probably have bad filter caps. 2200uf caps big ones, go bad and lose their capacitance and cant process the low end notes, sounds like a motorboat or ******* out. speaker may have issues as well. get the caps from mouser.com and careful of stored voltage on the capacitors it is deadly....... those caps are less than 2 bucks each.

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1 Answer

Tweeters & Midrange Speakers


If you have a Ohm Meter, check the resistance to the speakers. If it is very high, the speakers are burned, (or the crossover is (just capacitors, and resisters...cheap)). If it is close to 4 ohms check the wiring and connectors..to and at the speakers, most likly the receiver/amp is not blown.

Apr 20, 2008 | KLH 1230SB Main / Stereo Speaker

1 Answer

My speakers sound flat with no highs at all


I am trying to work out if you have damaged the speakers and amp too.
Have you tried a pair of headphones on the amp? If they sound ok then your amp is fine.
Assuming it is, then speakers have what's called crossover units in side each of them. This splits the sound into three parts. Bass, midrange, treble. The bass is handled by the woofer's, the midrange by a middle sized speaker or or it's combined with a tweeter, which of course handles the treble.
Connecting a 1.5 volt battery across any of the individual speakers will cause it to pop if working. If the speaker then is not getting sound then the crossover unit is to blame.
When you look at the crossover unit, it will have coils and capacitors (non polarised) on it. The bigger ones deal with the bass and the smaller ones treble. If you find a fault say on the crossover of the speaker, for example no treble comes out of it. Then start by replacing the capacitors. Use the same value as on the capacitor and remember they fit any way round.

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