No bass with SI T-amp. Why ? - diyAudio
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Old 15th April 2005, 03:30 PM   #1
irss is offline irss  Lithuania
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Red face No bass with SI T-amp. Why ?

Sorry for being total rookie and asking stupid questions...:/

I cannot understand, what's wrong with my SI...
I cannot get used to the problem, that T-amp does not provide bass sound. All CD's sound very weak, flat and rather annoying. I feel a little dissapointed, since I excpected so much from the T-amp. The bass sounds a bit superficial, not deep.
Since I have played bass guitar for a rather long time, I know how bass should sound...

I am not completely a bass freak, however, almost total non-availability of bass with T-amp really worries me. What I really hear are lots of highs and mids...and just a tiny bit of bass

I don't use pre-amp and my CDP is NAD C521BEE. Power supply is DC 1A.

My speakers are not the best (around 88dB), however if I connect SI to PC sound card, the bass appears to be fine, although not perfect. My listening level is at 9-10 o'clock on the SI.

I already enquired panomaniac about warm-up period. My SI has been used for about 40 hours, so I suppose warm-up is not an issue here...

What could be the problem? CDP or speakers? Would the bass problem be solved if I got better speakers (i.e LOTH-X BS1, 94dB) or should I start thinking of getting rid of NAD CDP?

IF speakers are an issue, how would speakers with bigger sensitivity solve the bass problem?

As regards modyfing T-amp...I'm really afraid to do that in order not to ruin it, because it is almost impossible to get another one in this part of the world

I greatly appreciate any advices.
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Old 15th April 2005, 03:47 PM   #2
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Did you use the search function before posting ?

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Charles
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Old 15th April 2005, 05:10 PM   #3
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Default Bass

If the speakers sound fine with another amp, then they are not the problem. If the CD player sounds fine with another amp, it is not the problem. Try each piece with other equipment before you condemn it.

Only once you have, by trying each part with other equipment, and narrowed it down to one piece do you replace anything. Most people can borrow equipment to test like this or are able to take their equipment to some one else's place.

If it is the amp, poor bass is caused in most cases by a high pass filter being accidentally in the ON position. AFter that, by either insufficient power supply capacity or by having too small a value of coupling capacitors.
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Old 15th April 2005, 05:49 PM   #4
IVX is offline IVX  Russian Federation
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Charles,
what you mean?
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Old 15th April 2005, 05:57 PM   #5
ohenry is offline ohenry  United States
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Quote:
Originally posted by IVX
Charles,
what you mean?
There have been discussions regarding the input caps being the cause of rolled-off bass. This may be why irss is experiencing less bass than he desires, although it shouldn't be as weak as he describes. Maybe a little system synergy problem?
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Old 15th April 2005, 05:59 PM   #6
bwbass is offline bwbass  United States
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Quote:
Originally posted by phase_accurate
Did you use the search function before posting ?

Regards

Charles
I think he means this:
Click the image to open in full size.
http://www.michael.mardis.com/sonic/Bass.htm

This amp has a known bass roll-off due to the design of the input stage. There are mods to fix this, just search...
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Old 15th April 2005, 06:35 PM   #7
IVX is offline IVX  Russian Federation
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Ahh.. i see, thanks..!
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Old 15th April 2005, 06:50 PM   #8
irss is offline irss  Lithuania
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"...If it is the amp, poor bass is caused in most cases by a high pass filter being accidentally in the ON position..."

dmfraser: could you please explain what does it mean? I suppose you're not talking about SI T-amp?...'cos there is the only switch I can find: Power On/Off switch.
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Old 15th April 2005, 06:59 PM   #9
dgo is offline dgo  Netherlands
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Quote:
Originally posted by bwbass

I think he means this:
Click the image to open in full size.
http://www.michael.mardis.com/sonic/Bass.htm

This amp has a known bass roll-off due to the design of the input stage. There are mods to fix this, just search...

Yes,

But that's not what causes his problem imo. He's talking about virtually
no bass at all. Even with the roll off mentioned, the standard SI is capable of producing quite a lot of lower frequencies although maybe not perfect when measured..
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Old 15th April 2005, 07:16 PM   #10
irss is offline irss  Lithuania
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yep....as dmfraser suggested, I swaped with another AMP (old old technics). CDP and speakers - the same.

...and now there is bass. LOTS of it.

Therefore, dgo is right, there is virtually no bass with SI at all.
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