Absolute top tier DAC for standard res Redbook CD

Hi Matt, according to my materials, there is no indication of use of an Analog Devices AD 1955 DAC chip in the Rowland Aeris. Some dated secondary internet sources mention an Analog Devices AD1853 instead.

Regardless, I continue to listen and enjoy with my ears... No Princess And The Single Bit Pea living here *grins!*

G.

10-23-15: Georgelofi

Ricevs right, the AD1955 is bit of a hybrid a 5bit Multibit and Delta Sigma, no R2R ladder. And far cheaper to manufacture than say a real R2R Ladder like the PCM1704K.

Sounds like an each way bet on the cheap, trying to get what Multibit can do yet still do DSD.

Cheers George

George, my view is it is not fair to judge a dac chip by itself without considering the overall quality of the dac & skill of the Designer (ie: implementation). I own a Vitus SCD-025Mk2 which is a $20kEUR dac/cdp which I can say hand on heart is the best single box cd player i've heard (including a CH D1 with the dac option & Accuphase DP-700).

As a dac, the Vitus bested my previous Vimak DS-1800Mk2 which I regard as the best Delta Sigma dac ever made. I also previously owned a highly modded Ayon CD-5s which uses a quad of BB PCM-1704k chips. I enjoyed my time with the Ayon which did some things very well & was a fun player, though the Vitus is in another league altogether.

The AD1955 is $7.00.....sounds cheap to me....I quess you don't like the word Cheap? How about inexpensive?....less offensive? I did not say the Berkeley Ref or any expensive DAC is cheap....just talking about the DAC chip.....it is cheap. cheep cheep went the bird...he he.

I agree with others that say the DAC chip is only one part of the whole.....you can take a $7 DAC chip and make a state of the art DAC with it (Berkeley) if you know what you are doing. Schiit chooses to use 4 $75 R to R DAC chips in their $2300 product....but I bet it does not sound any where near as good as the Berkeley.

A couple of years ago Martin Colloms raved about the $100,000+ Audionote DAC that uses the obsolete 18 bit AD1865 DAC chip.....no digital filter at all. Says it can compete with vinyl playing CDs! I notice that Border Patrol has just released a $10,000 DAC using the same chip with tubes on the output. I am thinking of making a DAC myself with this chip....I made one around 2000 and it sounded incredible.....I have more ammunition now...should be fun.

I have found Ricevs, with current output R2R ladder dacs, very important is the I/V stage and it has to be done active without feedback, and have posted my experiments and findings here.

http://www.diyaudio.com/forums/digital-source/227677-using-ad844-i-v.html

AD1855 is a true R2R Ladder Multibit dac.

From Analogue Devices.
"The 18-bit D/A converters use a combination of segmented decoder
and R-2R architecture to achieve consistent linearity and
differential linearity. The resistors which form the ladder structure
are fabricated with silicon chromium thin film. Laser trimming
of these resistors further reduces linearity errors resulting
in low output distortion."

Cheers George

10-24-15: Ricevs
The AD1955 is $7.00.....sounds cheap to me....I quess you don't like the word Cheap? How about inexpensive?....less offensive? I did not say the Berkeley Ref or any expensive DAC is cheap....just talking about the DAC chip.....it is cheap. cheep cheep went the bird...he he.

Priceless. When you pop the top on a lot of this stuff, and do the math, it can be a little disconcerting.....:/