it's 489$ on Aliexpress as well, from "official trader" including shipping. that's very expensive, specially for buying AE , in which one know that returning the product (on any issue) is extremely unaffordable .Really thanks for pointing this out...
$479.99 is the price with high shipping cost and high tax since G7 weighs up to 5kg and shipping to US directly from China with high tariffs.
In fact, the price will be $299.99 if it is available on Amazon US, just consistent with our official website the small bulk of the G7 is on the way and will arrive in US within one month.
I've told my colleague responsbile for Amazon US, he changed the price to $299.99 already...
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Douk Audio G7 is Coming! TPA3255 Amplifier with a Built-in Power Supply!
- Thread starter Douk Audio
- Start date
Jimster480
Major Contributor
I think they will get all this sorted out very soon. The amp itself is great, and at their actual target price... its basically a steal considering all the features that you get.
Audionaut
Major Contributor
Yes, all in all, everything you could wish for is on board.
BUT: This is not particularly clever
"In fact, G7 is 2 x 2.0 channel output with 2 TPA3255 chips, which means 1 3255 chip is responsible for 2.0 channel.
If used like that, both TPA3255 chips are operational, but only half of each chip is active, dedicated to either the left or right channel."
You have two TPA3255s in the amplifier, a large power supply—and you're not taking advantage of the opportunity for 2 ohm stability.
I have no idea why they didn't do that.
Where is that quote from? I struggle to believe they are not using PBTL if they are putting two chips in there.
Jimster480
Major Contributor
Maybe they couldn't wire it in both ways?
There is also no auto on/off without 12V trigger. I provided feedback about this and they will see if can be in future batches.
Audionaut
Major Contributor
Douk Audio G7 is Coming! TPA3255 Amplifier with a Built-in Power Supply!
This thing is awesome (unlike my cable management) Not able to take any measurements of the amp itself, but it sounds pretty indistinguishable from my other amps: 3e A7, Fosi V3 Mono, Douk A5, and Buckeye NC502mp. Which is to say that it does the intended job! Currently powering some Elac...
www.audiosciencereview.com
Douk Audio G7 is Coming! TPA3255 Amplifier with a Built-in Power Supply!
This thing is awesome (unlike my cable management) Not able to take any measurements of the amp itself, but it sounds pretty indistinguishable from my other amps: 3e A7, Fosi V3 Mono, Douk A5, and Buckeye NC502mp. Which is to say that it does the intended job! Currently powering some Elac...
Thanks @Audionaut
@Douk Audio - is this correct - you are not using PBTL to get the higher current capability for low impedance loads?
Or is this just a misunderstanding?
scorlee
Member
It features a USB input that functions both as a DAC and for configuring the DSP chip. Ideally, it would also include a USB-HID interface to facilitate easy pushing and pulling of DSP filters, and adding a subwoofer output could serve as a useful enhancement. It is assumed that the VU meters are electronic rather than physical moving-coil meters; if this is the case, there should be an option for VU or True-Peak ballistics. For a power amplifier, peak levels are critical—unlike average power, which is roughly what a VU meter displays. If the meters are indeed moving-coil types, a quasi-peak mode with a 1 or 2ms integration time should be offered, as VU meters again provide little useful information for power amplifiers.
Jimster480
Major Contributor
What are you referring to? There is no DAC or USB port?
scorlee
Member
sorry, missed a word 'should'
The Douk rep has contradicted themselves several times, I think not just a language problem but from simply not understanding how dual-mono, PBTL and 2ohm stability are all equivalent terms with the TI 3255 design architecture.
This statement I believe is true and accurate:
"In fact, G7 is 2 x 2.0 channel output with 2 TPA3255 chips, which means 1 3255 chip is responsible for 2.0 channel.
If used like that, both TPA3255 chips are operational, but only half of each chip is active, dedicated to either the left or right channel."
This was in response to a member testing one pair of speakers, using one Left channel from the G7 Speaker A output, and the Right channel from the Speaker B pair, hoping they would get dual-mono PBTL, i.e. greater power output at lower impedances and stability down to 2ohms.
Douk's answer shows clearly this is NOT the case, and for speakers that are hard to drive, requiring high CURRENT in order to support Voltage from collapsing as impedance is lowered, this G7 amp will NOT give the same power-amp performance as 3e A7, Fosi V3 mono nor Wiim Amp Ultra.
I suspect that PFFB even if present is not so relevant for such speakers where impedance varies widely dropping at high SPL and low frequencies.
The 48V PS could probably just as well be 5A without hurting any aspect of performance.
And yes the VU meters are pretty lights bouncing to the beat but not displaying anything objective.
Ability to A/B test speakers would be nice if the outputs to each pair could be level matched and thus switching made relatively safe without turning SPL down between cycles.
I would LOVE for my above WAG conclusions to be proven wrong, but for myself I will not rely on vendor statements but Amir measurement / testing.
At a $200 price point I will be happy to fund that testing with a drop-ship to Amir, so long as they can get the unit to me within a couple months after receipt. If I am correct the amp is plenty for my L/R Rear surrounds, and I do enjoy pretty bouncing blue lights...
This statement I believe is true and accurate:
"In fact, G7 is 2 x 2.0 channel output with 2 TPA3255 chips, which means 1 3255 chip is responsible for 2.0 channel.
If used like that, both TPA3255 chips are operational, but only half of each chip is active, dedicated to either the left or right channel."
This was in response to a member testing one pair of speakers, using one Left channel from the G7 Speaker A output, and the Right channel from the Speaker B pair, hoping they would get dual-mono PBTL, i.e. greater power output at lower impedances and stability down to 2ohms.
Douk's answer shows clearly this is NOT the case, and for speakers that are hard to drive, requiring high CURRENT in order to support Voltage from collapsing as impedance is lowered, this G7 amp will NOT give the same power-amp performance as 3e A7, Fosi V3 mono nor Wiim Amp Ultra.
I suspect that PFFB even if present is not so relevant for such speakers where impedance varies widely dropping at high SPL and low frequencies.
The 48V PS could probably just as well be 5A without hurting any aspect of performance.
And yes the VU meters are pretty lights bouncing to the beat but not displaying anything objective.
Ability to A/B test speakers would be nice if the outputs to each pair could be level matched and thus switching made relatively safe without turning SPL down between cycles.
I would LOVE for my above WAG conclusions to be proven wrong, but for myself I will not rely on vendor statements but Amir measurement / testing.
At a $200 price point I will be happy to fund that testing with a drop-ship to Amir, so long as they can get the unit to me within a couple months after receipt. If I am correct the amp is plenty for my L/R Rear surrounds, and I do enjoy pretty bouncing blue lights...
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