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Class D Switching Power Amplifiers and Power D/A conversion

500W of ICEpower for USD0, deal or not?
500W of ICEpower for USD0, deal or not?
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Old 22nd August 2019, 05:20 PM   #21
menlobob is offline menlobob
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Originally Posted by mga2009 View Post
Excellent. I will keep you posted then with the innards of the VOCOPRO Featheramp.

In the best of cases it has a nice ICEpower amp module with a nice pre-amp.
Do you have a delivery estimate? Thinking about ordering 3 but Id like to confirm the 125 module first.
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Old 22nd August 2019, 05:35 PM   #22
mga2009 is offline mga2009
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Originally Posted by menlobob View Post
Do you have a delivery estimate? Thinking about ordering 3 but Id like to confirm the 125 module first.
I live overseas, so I don't really have an ETA... I expect it within the next 7 days.
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Old 23rd August 2019, 11:20 PM   #23
darkzyf is offline darkzyf  United States
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Hi everyone, I just received it and here're the guts It's indeed 125asx2!

only connect to desktop system with a brief listening, i prefer not to comment on how it sounds yet, but build quality is great and it seems have a preamp buffer built in.

thank you mga2009 for the great find!
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Old 24th August 2019, 04:59 AM   #24
menlobob is offline menlobob
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Originally Posted by darkzyf View Post
Hi everyone, I just received it and here're the guts It's indeed 125asx2!

only connect to desktop system with a brief listening, i prefer not to comment on how it sounds yet, but build quality is great and it seems have a preamp buffer built in.

thank you mga2009 for the great find!
These things are a steal. I just bought 3 for $275 US.
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Old 24th August 2019, 03:10 PM   #25
hifiamps is offline hifiamps  United States
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Originally Posted by darkzyf View Post
... it seems have a preamp buffer built in.
Can you ID the chip on the preamp board?
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Old 24th August 2019, 07:46 PM   #26
seanny is offline seanny  United States
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What version is that board?
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Old 24th August 2019, 11:37 PM   #27
darkzyf is offline darkzyf  United States
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no idea, already put it together. this is great deal whatever is inside in addition to the power module
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Old 25th August 2019, 02:06 AM   #28
Bearman is online now Bearman  United States
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So, is the 3.5mm input connected to the preamp and the differential input in the back not? Just curious since I just ordered one
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Old 25th August 2019, 05:05 AM   #29
hifiamps is offline hifiamps  United States
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Originally Posted by Bearman View Post
So, is the 3.5mm input connected to the preamp and the differential input in the back not? Just curious since I just ordered one
From the picture by darkzyf, it looks like the balanced 1/4" inputs connect to the preamp board powered from the AUX supply jack of the 125ASX2. In the 125ASX2 datasheet, it says that in BTL mode, Vin channel 1 needs an outboard inverting opamp (Figure 17). Also, in the online FA-500 manual it says in BTL mode: "Note that if you have a stereo source audio signal, the LEFT/RIGHT channels will be mixed into a mono signal. You can still adjust the volume of the LEFT/RIGHT mix by using the LEFT and RIGHT gain knobs on the face panel."
In the picture here by darkzyf it looks like there is another preamp board at the far end on the output side of the 125ASX2.
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Old 25th August 2019, 06:33 AM   #30
Nisbeth is offline Nisbeth  Denmark
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500W of ICEpower for USD0, deal or not?
Quote:
Originally Posted by hifiamps View Post
In the 125ASX2 datasheet, it says that in BTL mode, Vin channel 1 needs an outboard inverting opamp (Figure 17).
Only if you want to use the same SE source as when you operate the module in SE-mode (look at fig. 17 and you'll see an SE-source).

BTL mode with a balanced source on a TRS plug does not need that inverter (at least when we talk about the "raw" module - not sure how these amps are wired).
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