Absolute top tier DAC for standard res Redbook CD

Hi,

I just want to add my observation of USB cable which may be benefit for all.

I use YFS USB cable from my Mac Mini year 2012 to Offramp 5 and SPDIF cable from Offramp 5 to Audio Note DAC mod to level 4.1

The sound quality of YFS data only-Reference USB cable is much better than Oyaide Continental 5s Silver USB cable in my system.

Because Audiophile USB cable is more heavy than stock USB cable. The heavy weight of USB cable makes too much force or stress on contact point in USB socket and has worst affect to sound quality. Then I do hanging the USB cable so that there is less or normal force or stress to contact point in USB socket. The sound quality improves a lot in term of transparency, focus, halo-graphic and much better clear vivid mid range sound.

This is my observation. Please try and report back of your result. It is an big improvement without any payment.

Interest information!

Why Multiple Subs?
I want to start my posts with a lengthy discussion on the use of multiple subs, first why they should be
used,  and then how they are setup.
First I think it a good idea to go over some history behind the concepts.  I will start by going all the way
back to my PhD thesis (30 years ago), which was on this precise topic.  At that time I was studying the LF
(low frequency) sampling statistics in small rooms and how these were affected by the rooms shape.  
This is important question in sound measurement because it tells us how many points (samples) we
need in  a reverberant room to find the true source sound power given that each point has variations of
the desired quantity due to the non‐diffuse nature of the sound field at LFs in small rooms.

http://gedlee.azurewebsites.net/Papers/multiple%20subs.pdf

Loudspeakers with Powered Woofers
Some loudspeakers include integral power amplifiers to drive the woofers. Such speakers provide a range of bass-tuning options not possible with conventional passive loudspeakers. A speaker with a powered woofer can be equalized to extend its cut-off frequency, allowing a relatively small-footprint speaker to deliver response to 20Hz. You can also adjust the bass level to best match your room. The ability to adjust each speaker’s bass output independently is a huge benefit, particularly in asymmetrical rooms. For example, if one speaker is in a corner and one speaker has no sidewall next to it, you can dial down the bass level from the corner-located speaker to compensate for its greater room gain.

http://www.theabsolutesound.com/articles/a-guide-to-better-bass-tas-197-1/

Review of marten coltrane speakers by Stereophile (USA) Feb 2005.

Michael Fremer, February, 2005

https://www.marten.se/reviews/coltrane_stereophile_Feb_05.pdf

Vapor Audio information?

http://www.audioaficionado.org/general-speaker-discussion/30482-vapor-audio-perfect-storm.html

Just for your information of Vapor Audio speakers.

Nust Montrivasuwat
"We are at NikStudio, Bangkok, Thailand used to order the speakers from this bad guy 2 year ago & never received the order so now we have to take legal action against this Vapor Audio Speaker company to have my money refund (only $1680.00).This kind of company should have a lesson & no longer be in business for ever.Be carefull"

Why is PM the Model Two out of production?

Everyone who hears the Pacific Microsonics Model Two of course immediately asks the question, "Why it is no longer available?"

Here is the answer written by Dave Peck, who formerly worked for Pacific Microsonics and now works for Euphonix (which continued the manufacturing of the Model Two after Pacific Microsonics was acquired by Microsoft), and was intimately involved with the manufacturing and testing of both the Model One and the Model Two:

"The HDCD converters were discontinued because it became impossible to build any more. When several critical components became obsolete, Pacific Microsonics made a 'last time buy' of as many of them as possible to allow production to continue for another year or two, as well as buying a large number of other components that were expected to go obsolete during that time period. All of them did go obsolete. So, at the end of that time period, it was then completely impossible to build any more. It would have required such a significant redesign that it would have been better to start from scratch on a completely new design.

However, by that time, Pacific Microsonics no longer existed and the converters were being built by Euphonix (by the same crew using all the same materials, test equipment, etc.). Keep in mind that the Model Two was never supposed to be a source of revenue for Pacific Microsonics. They were essentially sold at cost, and the company made money by selling the HDCD decoder chips to CD and DVD player manufacturers like Rotel and Denon. Since this did not benefit Euphonix, it was not practical for Euphonix to fund the design of a new version of the product. And as was pointed out, Keith Johnson and the other designers were busy with other work anyway and would not have been available.

BTW, although it is not possible to build new HDCD converters, Euphonix has a significant stock of service parts so there is no problem getting one of these converters serviced.

And yes! Keith Johnson's recordings are absolutely amazing. Check out anything he has done on Reference Recordings. He's also just about the nicest guy you'll ever meet."

JBL DD6700 specification.

Description Dual 15″ (380mm), three-way, floorstanding speaker designed for a superlative listening experience
Frequency Response 29Hz – 60kHz (half space); 45Hz – 60kHz (anechoic)
Recommended Amplifier Power 500 watts
Sensitivity (2.83V @ 1m) 96dB
Nominal Impedance 8 ohms; 5.0 ohms @ 80Hz; 3.0 ohms @ 40kHz
Crossover Frequencies (Hz) 150Hz (LF1 6dB/octave) 850Hz (LF2 24dB/octave) 20kHz (UHF 24dB/octave)
Ultrahigh-frequency Drive Components 1″ (25mm) pure-beryllium compression driver
High-frequency Drive Components 4″ (100mm) pure-beryllium compression driver
Low-frequency Drive Components Dual 15″ (380mm) three-layer, pure-pulp sandwich/foam core cone woofer
Height 43.7” (110.9 cm)
Width 38” (96.5 cm)
Depth 18.5” (47 cm)
Weight Weight: 313 lb (142.1 kg) / Shipping Weight: 383 lb (173.9 kg)
Finishes Rosewood or Maple

The lowest bottom frequency is 45Hz (anechoic). It is like bookshelf bottom end!