These look to be hitting the same market niche as created by ACA and ACAmini, but for those that can’t weild solder.
2W/channel 4W/bridged/$150 https://www.schiit.com/products/rekkr
10W/channel 30W/bridged/$300 https://www.schiit.com/products/gjallarhorn
dave
2W/channel 4W/bridged/$150 https://www.schiit.com/products/rekkr
10W/channel 30W/bridged/$300 https://www.schiit.com/products/gjallarhorn
dave
The mutation that creates a chicken as a new species usually happens in the gametes so likely the egg cme first. But it likely happened over many generations so things get a bit muddled.
dave
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Starting from the thread title/question, I just wondered if it was born first ACAmini or SCHIIT.
I liked your reply though. 😉
I liked your reply though. 😉
Woo woo, stacked rails!
Whereas the ACA Mini has 30,000uF of filter capacitance. But does it have "stacked rails"? Not knowing what "stacked rails" even means, I'm unable to answer.
Whereas the ACA Mini has 30,000uF of filter capacitance. But does it have "stacked rails"? Not knowing what "stacked rails" even means, I'm unable to answer.
"No Class D, no switching supplies, no fans." No transformer humming in the chassis, either; it's a brick with a connecting cable that can be located well away.
If they had put a DAC in there, with USB input, they could probably sell it as a DAC that happens to be able to drive speakers.
If they had put a DAC in there, with USB input, they could probably sell it as a DAC that happens to be able to drive speakers.
Hi Mark
From the PCB I can see +/-6V and +/-12V rails, maybe they’re doing something like what class G amps do and modulate the rails to reduce dissipation.
If that’s the case I wonder what assumptions they made when selecting the heat sinks? Meaning can it run continuous sinusoids at full power without going into thermal procreation? The manual states it has “over-temperature“ and “over-current protection”.
edit: I found the link to their AP text report, it looks like it runs continuous sines. Maybe it’s not doing anything fancy for the rails and just running the driver and output stages at different voltages?
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Have something like this with the same performance been built here? Withe same form factor - i.e. very small...
I like it. All of it. I want 1.
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I like it. All of it. I want 1.
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@TNT
I think that was inferred by the subject of this thread.
But if you asking about `smaller?'... Ultimately the limitation is dictated by the thermal management of the heat load produced as determined by the Class A power you want (as opposed to the electronics). This commercial offering appears to employ a convection cooled heatsink. Here is a similar solution:
The Amp Camp Redux:
https://www.diyaudio.com/community/threads/aca-redux.381346/
https://www.diyaudio.com/community/threads/amp-camp-amp-redux-complete-kits.394830/
You should be able to go smaller with forced air cooling. The state of the art is probably to be found in CPU cooling solutions; heatsinks/TE coolers(?) & fans. But most DIYAudio projects with this tech. appears to be driven by the need to shift large amounts of heat, rather than to shrink a package to a minimum size.
I think that was inferred by the subject of this thread.
But if you asking about `smaller?'... Ultimately the limitation is dictated by the thermal management of the heat load produced as determined by the Class A power you want (as opposed to the electronics). This commercial offering appears to employ a convection cooled heatsink. Here is a similar solution:
The Amp Camp Redux:
https://www.diyaudio.com/community/threads/aca-redux.381346/
https://www.diyaudio.com/community/threads/amp-camp-amp-redux-complete-kits.394830/
You should be able to go smaller with forced air cooling. The state of the art is probably to be found in CPU cooling solutions; heatsinks/TE coolers(?) & fans. But most DIYAudio projects with this tech. appears to be driven by the need to shift large amounts of heat, rather than to shrink a package to a minimum size.
OK - to be clear - I understand that one cant get a class A amp into such small cabinet - so I dont anticipate Class A - anyways, the ACAs has much more distortion than this little box so no comparison really - I dint get the title really... but is a cool (ETP) little thing. No ACA for me - to "hot" and to "entertaining"... 😉
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Many years ago, I tried to introduce water cooling to these physically tiny transient loads we used to test power supplies. By mounting a copper, fluid filled pipe very close to the FETs thermal tab, you could use it right up to SOA limits all day - as long as the water flowed.
But, they didnt like "water" on an electrical test bench (testing voltages in the single-digit range) so they s-canned my idea, put a tiny little HS on the device and added thermal shutdown protection. It was still usable in transient operation; a transient current device that was now only usable transiently...Better score that measurement quick!
The cooler / pumps were a common design for CPU cooling and they were way overkill. To be usable in a HiFi amplifier, fluid flow would have to be of course enabled silently. But if you could do it, the amp could be the size of a mint tin, or the current size of this product but with more WPC, harder bias - whatever this one cannot do because of the HS limitation.
I say if the computer gamers are as enthusiastic to drive a market for these water cooling systems, why not "Us"? If the coffee guys are enthusiastic enough to have a direct cold water line to their espresso machine... I say that because we do not know how much water it would take to cool during a 3 hour listening session. 1 or 10 gallons? It'd be simple to figure out empirically.