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KGUSS DP-A1 Amplifier review

thin bLue

Senior Member
Reviewer
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Jul 29, 2019
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20221120_165636.jpg



This is a review and undetailed measurements of the KGUSS DP-A1 stereo Full-Digital power amplifier. It is on kind loan from 르나 of 'DCinside Speaker gallery' and costs 0 yet. (Return will coast about USD 5, but who cares!)


A Cute small Multi functioned Amp.

I tested with Both AUX in, Optical in

Let's see AUX first.

KGUSS DP-A1 AUX SINAD 20k 4 ohms 5 w.PNG

4 Ohm 5 W
20k Wolf's standard
KGUSS DP-A1 AUX SINAD 22.4k 4 ohms 5 w.PNG

4 Ohm 5 W 22.4k ASR standard

Great supports.PNG

Special thanks to @JohnYang1997
KGUSS DP-A1 AUX SINAD 40k 4 ohms 5 w.PNG

And, own 4 Ohm 5 W 40k broadband

Well.. not so happy. look at that harmonics.
But no 60(50)Hz Hum is good thing.


KGUSS DP-A1 AUX GAIN 22.4k 4 ohms 5 w.PNG

4 Ohm 5 W GAIN
KGUSS DP-A1 AUX FR 22.4k 4 ohms 5 w.PNG

4 Ohm 5 W FR
:facepalm:
KGUSS DP-A1 AUX FR extended scale 22.4k 4 ohms 5 w.PNG

4 Ohm 5 W FR extended view

Check how deep roll-off goes out

KGUSS DP-A1 AUX Multitone 22.4k 4 ohms 5 w.PNG

4 Ohm 5 W Multitone

Ultrasonic weapons are ready
KGUSS DP-A1 AUX Power sweep 22.4k 4 ohms 5 w both ch driven.PNG

4 Ohm Power sweep

Self shut down as protection, around 80~90 W
I do not recommend push this amp over 60W



And Optical input
KGUSS DP-A1 Optical SINAD 20k 4 ohms 5 w.PNG

4 Ohm 5 W SINAD
20k
KGUSS DP-A1 Optical SINAD 22.4k 4 ohms 5 w.PNG

22.5k
KGUSS DP-A1 Optical SINAD 40k 4 ohms 5 w.PNG

40k
KGUSS DP-A1 Optical GAIN 22.4k 4 ohms 5 w.PNG

4 Ohm 5 W
GAIN
KGUSS DP-A1 Optical FR 22.4k 4 ohms 5 w.PNG

4 Ohm 5 W FR
Way better than AUX In, and low bump is not exist.
APx525B FR loop back 22.4k.PNG

This is Loopback of APx525B some thing is happening.. but we can still read meaningful results..
KGUSS DP-A1 Optical Multitone 22.4k 4 ohms 5 w.PNG

4 Ohm 5 W
Multitone
Also better than AUX In, but....
KGUSS DP-A1 Optical Power sweep 22.4k 4 ohms 5 w both ch driven.PNG

4 Ohm Power sweep

Again, Self shut down as protection, around 80~90 W
I do not recommend push this amp over 60W

f1684a37ec88684b1020a9cbc4728f6a_res.jpeg


Conclusion It is hard to recommend KGUSS DP-A1 Amplifier
Just Cry Quuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu
 

restorer-john

Grand Contributor
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Mar 1, 2018
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Gold Coast, Queensland, Australia
Can you just do a low end (0.5Hz) slow linear sweep (to a few hundred Hz with say a 100 steps) to see what's going on in the lowest octaves? The 32 multitone shows nothing about what is happening below, when the first tone is 15Hz.

And check for DC.

But yeah, otherwise, throw it in the bin. It's trash.
 
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