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$30 Sonic Impact T-Amp for K1000's - Page 3

post #31 of 97
Well, I just bit the bullet. I have a pair of Boston Acoustics bookshelves, and will have an eddiecurrent HD25 as a preamp. I'll primarily use the speakers for movies, but once in a while for games.
post #32 of 97
Quote:
Originally Posted by Jon L
Come on, give us a hint. Are these mods going to be simple enough for us klutz? How about some prelim info?
Hi Jon,

The mods are mainly tiny surface mount soldering. Those resistors are very small and the pads are very delicate. The lead pitch on the pins of the TA2024 are also very small. Because I work in the electronics industry, I learned how to solder surface mount devices. It takes practice and patience, and most likely a microscope to check the integrity of the soldering.

Prelim info:

New 4" x 6" x 2.5" black anodized aluminum enclosure

12V SLA battery power with charger included

Highly modified TA2024 board

Direct wiring of 12V line to TA2024

Direct wiring to "shunt-mode" pot and then direct to the board


Here is the thing. I must confess that I am not a head-fi man and have not even tried this with a pair of headphones. Please don't stone me I have been reading posts here of a few of you who are finding it to work well powering headphones and this got me thinking "maybe this can also be an awesome portable headphone amp?" I was thinking of adding a headphone jack to it as well. Would it be as simple as connecting the headphone jack in parallel with the speaker outputs, or does there need to be some attenuation network or something?

I appreciate all your feedback.

-Vinnie
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post #33 of 97
Eck, no thanks with surface-mounting. Do you plan to market or custom-DIY the Sonic Impact for others in some way?

As far as headphone amp, the only phones SI can drive without any mods/adjustment is AKG K1000, which requires usually around 8 WPC.

To drive the usual headphones from a regular amp, there's some info at
http://headwize.com/faqs.htm#amp
post #34 of 97
Quote:
Originally Posted by Jon L
Eck, no thanks with surface-mounting. Do you plan to market or custom-DIY the Sonic Impact for others in some way?

As far as headphone amp, the only phones SI can drive without any mods/adjustment is AKG K1000, which requires usually around 8 WPC.

To drive the usual headphones from a regular amp, there's some info at
http://headwize.com/faqs.htm#amp
Jon,

Thank you for the link. Yes, I plan to market a battery powered amp that uses a highly modified version of the SI board. I'm most likely going to order parts to make 10 of them to start, and we'll see what happens. They should be ready by the end of the month...

There are most likely rules against advertising here, so if anyone wants details, feel free to email me at vinnie822@yahoo.com

Regards,

Vinnie
Reply
post #35 of 97
I must admit I'm highly skeptical, but I just bit on that eBay deal for the T-Amp and cardboard speakers for about $35.50 shipped. I originally just wanted the T-Amp by itself, but the cheapest I could find it for was $29 shipped so I figured I may as well consider those speakers a $6 toy to mess with.

I don't own K1000's but I do have a pair of brand new, boxed Athena AS-B2 bookshelf speakers lying around. I bought them because I had a really good discount opportunity (got them for about 50% off retail) but I haven't been able to spring for a quality integrated amp so boxed they've remained. If the T-Amp lives up to the hype, maybe I won't even bother with an integrated.
post #36 of 97
if it really isn't bright, there must be some great design difference between this sonic imact amp and the griffin powerwave (another t-amp) i bought (or we just hear things differently), because that amp with the k1000s was an unbearably, blindingly bright combination. i'll be interested to hear what others say about this, might want to pick one up for myself.
post #37 of 97
Thread Starter 
Quote:
Originally Posted by the terabyte
if it really isn't bright, there must be some great design difference between this sonic imact amp and the griffin powerwave (another t-amp) i bought (or we just hear things differently), because that amp with the k1000s was an unbearably, blindingly bright combination. i'll be interested to hear what others say about this, might want to pick one up for myself.
terabyte ... I can't comment on the Griffin Powerwave, having never heard one, but you may be on to something when you suggest that "we just hear things diferently". I haven't had my hearing checked lately, but it's likely these old ears have a few more miles on them than yours (they and me will be 62 this month ). I cannot rule out the possibility that high frequencies may get somewhat rolled off between ears and brain over here. I have always been sensitive to and bothered by sibilant sounding highs, and am naturally on the listen for them. What I heard was not an "unbearably, blindingly bright combination" though.

I have found that the little SI has it's definite limits, though. As they say, there is no free lunch. Here's what I posted in comaberini's thread:

************************************************** *******
I have been using with a RatShack 13.8V regulated supply, so plenty of juice. No preamp, though, just the native volume control.

Just for yucks, I put in some classical with very wide dynamic range (Night on Bald Mountain, 1812 Overture), and cranked the volume while standing well away from the K1000's.

As a result, I have come to the conclusion that the little SI performs famously, but within very definite limits. When those limits are reached, bad things happen in a hurry, sonically - things like distortion and clipping. I have no way of measuring, and the point where this happens is orders of magnitude louder than I would ever listen, but definitely there. My sense of feel (whatever that is worth) suggests that this is around 5 watts of output.

Conclusion? When over driven by a high input signal or demands of less efficient speakers, distortion and clipping is evident. When used within its limits, the SI puts out very sweet sounds indeed - clean, accurate, punchy, and a joy to listen to.
************************************************** *******
post #38 of 97
got my axioms hooked up with home depot 14 gauge extension cord and iriver imp550 as source for now. i thought it sounded very good; nice instrument seperation, and very clear beautiful sound. the main problem i'm finding is volume. my speakers are 8ohm and 92db sensitive so volume should be ok, but it's not quite enough with the batteries. i'm getting an astron power supply and am hoping that will make the difference in pushing that extra watt or so. for now though, it's sounds wonderful. i just need some speaker stands and get a nice home cdp or computer source. even with the iriver though, it sounds very good.
post #39 of 97
ok, i have to revise a bit of what i said about the t-amp. in that, i think this thing is just absolutely fantastic. i've never enjoyed music like this before, and that's with an iriver pcdp as source! if you need an amp, or a nice doorstop, get one! listening to classical piano is amazing. the seperation and highs are just excellent
post #40 of 97
Quote:
Originally Posted by uzziah
my speakers are 8ohm and 92db sensitive so volume should be ok, but it's not quite enough with the batteries.
In one of the reviews I read about the M3Ti the reviewer said that he did not quite believe the 92db sensitivity number.
Edit: In fact they show some measurements here and measure a sensitivity of 86db.

Will you have a chance to compare the T-Amp with a decent analog receiver for driving these speakers?
post #41 of 97
Target has the T-Amp on their website for $29.99. Anyone know if they carry it in stores?

What kind of power adaptor does this thing use?

edit:
Targets page says web only. Guess I missed it the first time...
post #42 of 97
16V 1A AC adapter. I think the jack is 5.5/2.1.
post #43 of 97
Quote:
Originally Posted by guppi
In one of the reviews I read about the M3Ti the reviewer said that he did not quite believe the 92db sensitivity number.
Edit: In fact they show some measurements here and measure a sensitivity of 86db.

Will you have a chance to compare the T-Amp with a decent analog receiver for driving these speakers?
afraid not, unless you want to send me one of course, you must understand that this is my first stab at hi-fi audio, and thus you have to take my opinion with a grain of sand. i know nothing about the actuality of the sensitivity numbers. once i've got a better (home) source (probably emu 0404), and the astron power supply, i'll post my impressions again. i thought it sounded very good, but i felt i wanted a little more "umph", and also the dac in the iriv obviously can't stand up to a home source
post #44 of 97
Quote:
Originally Posted by S_Dedalus
16V 1A AC adapter. I think the jack is 5.5/2.1.
Officially it takes 12V. I think 16V might be pushing it. Here is a quote from the 6moons review:

Quote:
Tripath's published maximum voltage for this chip is 13.2V but they told me that a tightly regulated 13.8V supply is okay and I have had no problem goosing the amp to that level.
post #45 of 97
Quote:
Originally Posted by uzziah
i thought it sounded very good, but i felt i wanted a little more "umph", and also the dac in the iriv obviously can't stand up to a home source
By lack of "umph" do you mean mostly lack of bass or lack of overall volume?
Did you use 1.5V alkalines or 1.2V rechargeables in the amp?
Definitely report back when you hook up the power supply.
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