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120 Volts Reciever using 220V active Subwoofer

Posted 19th September 2011 at 10:04 AM by rblinku2

Hi,
Could somebody help me, im getting OnkyoTx-NR609 from USA 120V. as my reciever and i decided to purchase the speaker here in the philippines using 220V. Should i expect a problem if i will use a 220V active subwoofer. (the Onkyo reciver will be using step down transformer 110V to be plugged into 220V outlet).

Tnx
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Old

Tube Rectifier Comparison with SSHV in between

Posted 16th September 2011 at 01:14 PM by dvb projekt
Updated 16th September 2011 at 05:38 PM by dvb projekt

Click the image to open in full size.
Vin= SSHV input / Vout= SSHV output


Because i am on vacation, i had the time to listen to two other tube rectifier i have.

The question, if there are still differences in sound with different tube rectifiers and the SSHV in between, is

YES !!!

Till now i used the Bendix 6101, a very nice sweet and soft sounding rectifier.

After i roll to the SED Winged "C" 5U3C (5U4-G) Black Plate rectifier,



...someone lift a invisible curtain...



Much more precision in the mids and highs and the soundstage open up in all directions.
Jesus, in comparison the Bendix sounds much to soft!

The Mullard GZ37/CV378 Coke Bottle has also the qualities of the 5UC3 Black Plate,
but is a bit softer sounding.

The only disadvantage
...
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Old

Salas Board Minikits and Full Kits

Posted 16th September 2011 at 02:37 AM by Tea-Bag
Updated 22nd July 2014 at 06:42 PM by Tea-Bag (expanding for all kits)

Here I am going to post some semi-commercial information regarding the minikits.



BIB or SSLV1.1
Make sure to read the full BiB build manual before ordering parts. The link is posted below.
BIB BUILD GUIDE REV2 BY SALAS

It is essential you understand and purchase for the correct voltage type and range you need for this kit and additional parts.

The purpose here is to report what parts are included in the minikit, and which are not.
This will assist builders in getting the correct parts that are not included in the minikits.

The minikits are made for one of the three sections of the PCB. The board itself can hold two positive and one negative rail type supply.

The kits are purely optional, and are sold to assist the buyer who may not be able to access the resources needed to gather the specific parts.

There are four kit types described below. IRF for voltage 5.5v...
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Old

Crossover for Vifa Center speaker

Posted 14th September 2011 at 01:59 PM by John_wr

I no longer own this speaker. Unfortunately I don't have all details of component values or the polarity of driver connection.
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Old

First article about DEM (TDA1540, TDA1541)

Posted 9th September 2011 at 11:21 AM by Nazar_lv (Creative High end audio)
Updated 1st April 2014 at 10:49 PM by Nazar_lv

“Dynamic Element Matching for High-Accuracy Monolithic D/A Converters” RUDY J. VAN DE PLASSCHE. IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. SC-11, NO. 6, DECEMBER 1976
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Old

PCM58, the best 18bit parallel DAC

Posted 9th September 2011 at 11:14 AM by Nazar_lv (Creative High end audio)
Updated 1st April 2014 at 10:48 PM by Nazar_lv

Article from IEEE journal and datasheet about PCM58

AN 18-BIT DAC FOR CONSUMER APPLICATIONS” By F.J. Highton and K. Ito, 1988
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Old

MASH

Posted 9th September 2011 at 11:10 AM by Nazar_lv (Creative High end audio)
Updated 1st April 2014 at 10:48 PM by Nazar_lv

Articles and patents about SONY (NTT develop.) MASH DACs.

“A 17-bit Oversampling D-to-A Conversion Technology Using Multistage Noise Shaping” YASUYUKI MATSUYA, KUNIHARU UCHIMURA, ATSUSHI IWATA AND TAKAO KANEKO. IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 24, NO. 4, AUGUST 1989

US Patent 5,021,788
US Patent 5,073,778
US Patent 5,148,168
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Old

The F-word - or, why there is no such thing as too much feedback

Posted 8th September 2011 at 03:55 PM by jan.didden
Updated 8th September 2011 at 03:59 PM by jan.didden

Well, I did already a blog on feedback, it's uses, misuses and misconceptions. But there is someone who can explain it much better than I can, someone who has proven that he really understands what's going on in a feedback amplifier. Someone who knows what the terms 'fast amplifier' and 'slow amplifier' really mean (and what not). Enter Bruno Putzeys, who wrote the article with the subject name in my bookzine Linear Audio, Volume 1. I feel that this is such an important matter for audio that I decided to place it online for free download. You'll find it at Linear Audio | your tech audio resource under the tab Online resources.
Enjoy the ride, and do let me know what you think about these issues.

jan didden
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Old

Sapphire Desktop Headphone Amplifier Kit

Posted 8th September 2011 at 06:26 AM by rjm
Updated 10th December 2011 at 02:23 PM by rjm (add some photos)

Update: kits were sold, but another run of boards is going ahead!

There will be 10 kits available, at a cost of $100 each. The boards (rev. 14a1) and all parts for the boards will be included. Shipping is included.

Info here and here.
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Old

Highly evolved converters - the next generation

Posted 8th September 2011 at 04:47 AM by abraxalito

Its been over a year since I blogged about DACs, so, long overdue, here's an update. I've abandoned my considerable development on the AD1955 because I found something that's more interesting - multibit. In the first instance - NOS.

A while back I bought a TDA1543 NOS DAC to play with, just to see what all the fuss was about with NOS. Plenty of people have waxed lyrical about the sound. At first listen, I wasn't impressed although it had a certain tonal richness in portraying orchestral instruments that was alluring. Bottom line - its soundstage was compressed front to back. This made it sound a little 'forward' - foreground instruments and voices were more highlighted compared to acoustic spaces ('background').

A second aspect which plagues pretty much all NOS DACs is their frequency response can hardly be termed 'accurate' - owing to the sinc function of first-order hold, they exhibit a significant HF roll-off which begins around 5kHz and reaches 3.2dB...
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