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H.aaron 23rd July 2006 09:56 AM

What class D AMP in the ipod hifi?
As title, the iPOD HIFI say that this speaker contain class D amp .
what D amp may this use , some one have to open it .

classd4sure 24th July 2006 02:22 PM

Frequency response: 53Hz to 16kHz 3 dB

...who cares? :D Could be good for a laugh I guess. If you find out let us know.

phase_accurate 24th July 2006 02:30 PM

I remember vaguely that older computer speakers by Apple used Tripath. Maybe this one as well.



tuolumne 24th July 2006 08:20 PM

Could be....
Could be the LM4670...

SpittinLLama 24th July 2006 11:37 PM

It's not the LM4670. Most likely a Tripath part.


koolkid731 25th July 2006 12:35 PM

It uses TI classD IC, plus DSP to correct for speaker frequency response. It sounds crappy though.

phase_accurate 25th July 2006 12:49 PM


plus DSP to correct for speaker frequency response
Hmmmmm....... Why did I have the feeling that a computer company wouldn't be able to do proper analog design ? ;) :D :devilr:



classd4sure 25th July 2006 12:55 PM

My quick googling on the topic led to alot of laughable disgust amongst ipod users. They really dislike it. Apperently the frequency limitations on it are actually that of the Ipod? From what I gather though, it sounds like it's just meant to blast in the midrange.

kristleifur 25th July 2006 01:04 PM

Apple's use of Tripath chips

Originally posted by phase_accurate
I remember vaguely that older computer speakers by Apple used Tripath. Maybe this one as well.

I'm not sure whether they were used in external speaker units by Apple, they could have been, but Tripath (TA1101?) chips were used in a few PowerMac G4 models, the G4 Cube and perhaps some other types. The "PowerMac G4 Digital Audio" type, and a few later models AFAIK, are thusly equipped.

Out of curiosity, and delight with a T-Amp I'd recently heard then, I tried connecting Grado headphones to an old G4 tower we have around. It sounded very nice. Not that much punch, but that yummy "glassy" clarity I'd heard coming out of the T-Amp.

In case anyone's interested in Apple's usage of Tripath chips, there's some minimal info on these computer models on

A vigorous googling also turned up some random links:

I find this interesting as a chapter in the story of the acceptance of Tripath's chips, and their rise to fame. Nobody really seemed to give a shift when Apple used these chips :)

JohnW 25th July 2006 01:16 PM



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