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Old 10th February 2005, 08:41 AM   #31
Erukian is offline Erukian  United States
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I have a quick question i hope someone can answer.

If i buy the SI t-amp, and i crank the pot all the way up, and use my computer's soundcard to lower the volume to good levels -- use it like a preamp, will the t-amp distort/clip on my 94db/sensitive 8-ohm klipsch's?
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Old 10th February 2005, 11:37 AM   #32
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Quote:
Originally posted by Erukian
If i buy the SI t-amp, and i crank the pot all the way up, and use my computer's soundcard to lower the volume to good levels -- use it like a preamp, will the t-amp distort/clip on my 94db/sensitive 8-ohm klipsch's?
If your soundcard has enuff gain, sure... but it will be pretty loud.

dave
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Old 10th February 2005, 09:20 PM   #33
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Quote:
Originally posted by Erukian
will the t-amp distort/clip on my 94db/sensitive 8-ohm klipsch's?
As noted above, it all depends on how loud you go. You will get a good 4.5 watts before clipping, that should be very loud on your klipsch. You'll still only get ~1/8 watt average musical power per channel without clipping. Unless you have a huge room, that will be pretty loud at 94dB/watt.

You may not want to run the SI pot all the way open. Try 1/2 way first and make some tests. Let us know what you find.
FYI, the 10 o'clock position gives unity gain .
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Old 11th February 2005, 12:01 AM   #34
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From reading about the SI amp, i've picked up from somewhere that the pot does some bad things to the sound if it's not at 100%. Because i've read that if it's at 100% and if you hook up a good pre-amp then it sounds better. Is that true then?

It's pretty easy for me to add a trim pot to my output stage on my professional soundcard. So add like a -30 db trim and then it should all be righteous. right?
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Old 11th February 2005, 08:36 AM   #35
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If you're not afraid to open the SI up and do some soldering, you could just bypass the potentiometer altogether. To do this, you would need to open up your SI, pop out the volume board, and solder the volume in for each channel to the volume out.

To do it right, though, I would just suggest popping the main board off it's support and solder pin 3 to pin 7 and pin 4 to pin 6 on the volume board connector. Then just remount the board, maybe with some hot glue, or remelt the plastic, and you should be good to go.


Volume connector pinout:
(from Left to Right, looking down at the top of the board):

1 2 3 4 5 6 7

1 = switch 12volt out
2 = switch 12volt in
3 = to volume from right channel
4 = to volume from left channel
5 = ground
6 = from volume control to amp left channel
7 = from volume control to amp right channel
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Old 15th February 2005, 02:07 PM   #36
Bill F. is offline Bill F.  United States
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I'm trying to figure out gain structure to tri-amp with SIs. What's the input signal volage at onset of clipping?

Bill
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Old 16th February 2005, 04:57 AM   #37
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Quote:
Originally posted by Bill F.
I'm trying to figure out gain structure to tri-amp with SIs.
Good question. I'm not quite sure, but do know that unity gain is at about 10 o'clock on the volume control.

Tripath say optimum gain is 12V/V. I think the SI is lower than that but I can clip it with my portable CD player and it has a low output. I'll check into it.
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Old 16th February 2005, 01:37 PM   #38
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The gain of the SI is more like 21.6V/V. For the gain of 12V/V as shown in the Tripath datasheet the gain of the inverting opamp input stage is 1 (20K/20K). In the SI the gain of the input stage is 1.8 (36K/20K).

Gary
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Old 16th February 2005, 09:29 PM   #39
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Thanks Gary!
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Old 16th February 2005, 09:36 PM   #40
Bill F. is offline Bill F.  United States
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Wow, so <0.4V on the input is all I'll ever need? That's quite a bit less than other amps... Good to know.

Thanks guys.
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