T-amp Speaker Combinations

[Panelhead]

Originally posted by edtang
Just to confirm what I'll be doing... and a few more questions from the newbie...

Input:
I'll be getting a 2200uF 16V cap in series with a 20k Ohm resistor to connect from the volume POT to R1 & R2 (original R1 & R2 removed). This should take care of in the input caps right?


I think you have missed something here. Try 2.2 ufd caps.






Output:
Replace the 4 0.47uF caps C21-C24 (labeled "Co" on the Tripath data sheet). What value caps do I need to replace them with to make them match 4 Ohm impedance? (I see it says use 0.22uF for 8 Ohms)


There are no 0.47 or 0.22 ufd caps on the output of the SI. There is a 0.15 connected from +/-. Replace it with a 0.01 cap, then use 0.22 ufd from the speaker outputs to ground.





Where is the PSU coupling cap, and what size cap would you recommend to replace it?

Thanks for helping me out!

The power supply coupling cap can be anything you want. It is better if it is close to the board. Adding some small low impedance electrolytics from the power pins to the slug helps also. Look underneath and you will see the two surface mount caps bypassing the pins.


George

[Jumpin John]

I'll be getting a 2200uf 16 v cap in series with a 20k ohm resistor

I assume that you mean a 2.2uf cap on the input circuit. If a 2200 uf is used, you will need ear plugs to mask the turn-on noise. Check out Panomaniac's site, he has an excellent diagram, (with photos), of the method you described. Also, if you go to page 4 of the thread titled Sonic Impact 5066 Parts List & Modifications, you will find a discussion of the various options for coupling caps (with part numbers that Motherone was kind enough to supply).

[Jumpin John]

Originally posted by Jumpin John
I assume that you mean a 2.2uf cap on the input circuit. If a 2200 uf is used, you will need ear plugs to mask the turn-on noise. Check out Panomaniac's site, he has an excellent diagram, (with photos), of the method you described. Also, if you go to page 4 of the thread titled Sonic Impact 5066 Parts List & Modifications, you will find a discussion of the various options for coupling caps (with part numbers that Motherone was kind enough to supply).

Sorry, those are decoupling caps on page 4.

[edtang]

Thanks guys. My parts will be coming in this week, I'll let you know how it goes.

[nbrophy]

I found these Philips flat-screen TV stereo speakers while browsing All Electronics
(http://www.allelectronics.com/cgi-bi...SPEAKERS_.html).

They are listed as full-range 15W, 4 ohm speaker. I was thinking of buying a pair for my Sonic Impact T-amp. Anyone have any suggestion on whether these with be a good match for the T-amp?

Thanks,
Nathan

[planet10]

Originally posted by nbrophy
I found these Philips flat-screen TV stereo speakers while browsing All Electronics

They are listed as full-range 15W, 4 ohm speaker. I was thinking of buying a pair for my Sonic Impact T-amp. Anyone have any suggestion on whether these with be a good match for the T-amp?

You could probably find a more effective way to spend you $16. For instance, I think PE has some 3" TBs for about that that would go a lot further.

dave

[Godzilla]

>>> A little off-topic, but it's too bad that AR just makes cables now.. I really love my AR speakers.

I had a pair of AR15, AR18 and AR92. AR was one heck of a force back in the day. I'd love to hear your AR11s just that i think the SI amp may not have enough juice for them to sing.

[AdamThorne]

I own a t-amp, and I've heard some talk about how high-efficiency pro drivers are cool. So I've been kinda looking around for a 2-way maybe with a 12 inch driver and say 95-100 db efficiency that will give that 'effortless dynamics' feel. Maybe down to 40ish hz. Oh, and it's gotta be price-consumate to the t-amp.

Sadly, I have not seen much to satisfy this niche. I am thinking about trying to fill it myself, I've picked up a couple of MCM speakers 55-1745 (got 'em on sale for $25 each down from normal price $42) and I'm looking at PE's pyle pro ph44 horn tweeter. That's as far as I've gotten, tho. I got other projects to wrap up first... And anyway, someone suggested that the MCM woofer was a guitar speaker and wouldn't sound good. Time will tell - but at this point it might take a significant amount of time. If you all have any thoughts on this matter, I'd be interested to hear 'em.

But if you want to rock out with your t-amp, I understand a BIB would do it. My room can't support the BIBs, so I haven't really done the feasability study on that one.

Also, for those looking for a bit more volume, since I dropped a heatsink on my t-amp chip I feel like it's been able to give a little more oomph before giving up. But I might be imagining that. We should get panomaniac to do THD tests at different chip temps...

[nukegoat]

I'm powering my audio nirvana 10's off the little t-amp and it's more than enough for anything I plan to do in this little room. I wouldn't use it in my living room to power my towers though