• WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required. There are many reviews of audio hardware and expert members to help answer your questions. Click here to have your audio equipment measured for free!

miniDSP 2x4 HD (DDRC-24) V2 simple measurement and teardown pictures

wbenjin

Member
Joined
Jul 14, 2022
Messages
26
Likes
77
Since Amirm has reviewed miniDSP 2x4HD, there is new V2 version with different DAC/ADC chip (probably due to AKM fire), seems no one has published the measurement data and pictures of internal components, so I make some simple measurements and teardown. I am new to audio measurement field, so feel free to correct me if I was wrong.

First are teardown pictures:
DSCF1557.jpeg


PCB clearly shows 2x4 HD-V2:
DSCF1558.jpeg


Analog Devices "SHARC" ADSP-21489:
DSCF1559.jpeg


XMOS XU216
DSCF1560.jpeg


New codec chip - TI (former Burr-Brown Audio) PCM3168A:
DSCF1562.jpeg


TI LM2941CS LDO:
DSCF1563.jpeg


nichicon capacitor at each input/output:
DSCF1565.jpeg
DSCF1567.jpeg


And measurement data (Using E1DA cosmos ADC grade A, REW V5.30, output level set to -1dB yield best results):

1KHz RTA:
DDRC-24 1KHz.jpg

We got 102 SINAD which is better than previous version.

J-test:
DDRC-24 J-test.jpg

Looks clean.

Multitone:
DDRC-24 Multitone.jpg

Also not bad, if REW compute correctly it has 19 bits of ENOB.

I only measured USB in/RCA OUT 1, according to the results, I think DDRC-24 is a very good value DAC/DSP, you got Dirac Live full range ($200), UMIK-1 microphone ($80), DSP hardware and most importantly, DAC performance better than majority of low to mid-end amplifier. Although my measurements are simple, in my opinion, DDRC-24 (V2 version) is worth recommended.
 
Last edited:

Sokel

Master Contributor
Joined
Sep 8, 2021
Messages
6,007
Likes
6,007
It would be nice to repeat the tests but with filters engaged as shown in this thread but for the analog performance:


 

TurtlePaul

Addicted to Fun and Learning
Joined
May 19, 2020
Messages
631
Likes
1,027
Location
New York
Impressive that the THD+N on the MiniDSP is able to perform 8 dB better than the DAC chip’s (PCM3168A) spec sheet value (102 dB vs. 94 dB). Good implementation by MiniDSP.

Can you run a 90 khz bandwidth test to see if it have the same out of band noise as the AKM implementation?
 
Last edited:

koustuvk17

New Member
Joined
Oct 17, 2023
Messages
2
Likes
3
Thanks for the measurements! Is it possible to measure the resampling performance, the original was pretty rough in this regard.
 

peniku8

Senior Member
Forum Donor
Joined
Dec 9, 2020
Messages
367
Likes
732
Multitone:
View attachment 338547
Also not bad, if REW compute correctly it has 19 bits of ENOB.
It does not. REW's ENOB takes the ADC's 0dBFSpk as reference, which means this metric is only applicable to ADC measurements.
Your actual measured ENOB for the miniDsp would be around 17,7 bits, if you didn't check the "minimize cest factor" option.
 
OP
W

wbenjin

Member
Joined
Jul 14, 2022
Messages
26
Likes
77
It does not. REW's ENOB takes the ADC's 0dBFSpk as reference, which means this metric is only applicable to ADC measurements.
Your actual measured ENOB for the miniDsp would be around 17,7 bits, if you didn't check the "minimize cest factor" option.
Thanks for your correction, I will edit the post.
 

ViperDom

Member
Joined
Nov 6, 2022
Messages
48
Likes
40
Location
Delaware
Thanks for the info wbenjin.

Do we know when the V2 become available?

Is there any way to verify when ordering direct or 3rd-party that you will receive a V2 and not new old stock of the V1?
 
OP
W

wbenjin

Member
Joined
Jul 14, 2022
Messages
26
Likes
77
Thanks for the info wbenjin.

Do we know when the V2 become available?

Is there any way to verify when ordering direct or 3rd-party that you will receive a V2 and not new old stock of the V1?
I bought my unit on July 2022, so I think if you order directly from miniDSP you will get V2 version.
 
Top Bottom