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Marantz CD6006 CD Player - Review/Measurements

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Robciak

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MODERATOR NOTE: The below test is faulty and incorrect due to a faulty test CD that was used in the testing. A new test was completed and a link to this new review is provided in the last post in this thread. We are leaving this thread up as even in failure some valuable information and feedback may be provided here.

Hi,

Here is my review of the Marantz CD6006 CD player. This series has been replaced by the CD6007 (which costs about $600).

It is a standard CD player with analog, digital and telephone outputs.
tempImageHMYGYv.png
tempImageevqgVF.png



The manufacturer claims a dynamic range of 100 dB, which should meet the requirements for a standard CD resolution of 16 bits.

Zrzut ekranu 2024-02-17 o 13.54.33.png

Measured Files

Since there is no inputs, I used Wav files burned on CD. As file I used 1 kHz sine and sweep (20Hz-20kHz) both with 16 bits resolution and 44,1 kHz sampling rate. The audio files were dithered which slightly lowered the resolution. Below is a reference measurement performed on an APx525.


SINAD 16B.jpg
ENOB 16B.jpg


Quick comparison
Let's start with a quick comparison of all outputs.
Analog 16B.jpg
Optical 16B.jpg
Phones 16B.jpg


Measurements
Unfortunately, the CD6006 offers resolution of less than 15 bits, which is not enough for a CD. Even the digital output does not meet the requirements.

RMS level
Analog out slightly over 2 V, what accordance with typical RCA output.
Phones output: drives most headphones.
RMS Level 16B.jpg
Level 16B D.jpg

THD+N %

THD+N% 16B.jpg
THD+N% 16B.jpg
THD+N% 16B.jpg

SINAD
SINAD 16B.jpg
SINAD 16B.jpg
SINAD 16B.jpg

ENOB
All outputs have a lower resolution than the CD standard.

ENOB 16B.jpg
ENOB 16B.jpg
ENOB 16B.jpg

Dynamic range
Dynamic range lower than declared by the manufacturer.

DR 16B.jpg
DR 16B.jpg
DR 16B.jpg

Intermodulation distortion


SMPTE 16B.jpg
SMPTE 16B.jpg
SMPTE 16B.jpg

Frequency respons
Here are two measures of frequency response. The first is based on RMS level in the frequency domain and the second is a level relative to 1 kHz.

Analog
Unrelevant differences between channels around 0,01V. The Flatness of the frequency respons does not exceed 0,03 dB in the highest range.
Freq resp .jpg
Freq relativ .jpg

Optical
Flat frequency response.
Freq resp 16B.jpg
Freq relativ 16B.jpg

Phones:
Small differences between channel, around 0,04 V, with a 0,7 V drop at 20 kHz. Linearity drops to 0,2 dB at 20 khz (sorry for the bad framing of the graph).
Freq resp 16B.jpg
Freq relativ 16B.jpg
 
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Thank you for your high quality measurements!
The distortion profile seems to indicate Windows messed with the burning process; see this post.
@amirm it would be great if you can promote it to the homepage.
 
A $600 CD player that does not even measure well? What would explain those measurements? Are they audible? I'd have expected most modern CD players, many of which are far less $, to perform well today no?
 
Hello @Robciak, thanks very much for the report.
How did you burn the test CD? I see the distortion is of the same nature on both the analog and digital outputs which could indicate that it’s part of the CD, not the player.
With the digital output, distortion should be visually under the noise floor (on your 1kHz FFT).
Note that when burning with WMD, the “Adjust levels” box is enabled by default, and that adds distorsion when burning CDs.

EDIT: I found a print screen of some tests I performed a year ago. The FFT below (linear frequency scale) is of a burnt CD (from the digital output of a Denon DCD-SA1) with the default “adjust levels” in Windows Media Player. The distortion profile is exactly what you get too, so I think that’s where the problem is:

IMG_8541.jpeg


What we see here is a low level square signal added to the initial 1kHz sine. Again, this is exactly what you see on the digital output in your test.

Regards

————
Flo
 
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Hi @NTTY, many thanks for the advice. I'll analyze it and get back with the results!

Thanks!

 
Anyone know if CD6006 will downsample 48/16 from USB input before playing it through its internal DAC?
Manual only specify it will convert everything going to the S/PDIF output to 44,1kHz. Which make sense for compressed audio but not so much for the 192kHz capable CS4398 DAC if hi-res files is available on the USB media.
 
@NTTY you were right. The distortion was added by the “Adjust Level” function in WMP. Here are the measurements for the coaxial and analog output:

COAXIAL OUT
coaxial out.PNG


ANALOG OUT (sorry for FFT in Vrms)
analog out CD.PNG
 
Well ... So up to a certain point, the measurements posted here on Feb 17 are actually the results of an incorrectly burned test CD? :(
 
The OP has notified us that the above review test data is corrupted due to a bad test Cd. Therefore we are closing this thread and we redirect you to the new corrected review using a fixed test CD,

 
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