Copyright © 1998
Cadman Enterprises Ltd
Welcome to the Graham Slee Audio Products Owners Forum Open to all owners plus those contemplating the purchase of a Graham Slee HiFi System Components audio product and wishing to use this forum's loaner program: join here (Rules on posting can be found here) This website along with trade marks Graham Slee and HiFi System Components are owned by Cadman Enterprises Ltd |
Majestic DAC |
Post Reply | Page 123 5> |
Author | |
FritzS
Senior Member Joined: 18 Jan 2008 Location: Austria Status: Offline Points: 134 |
Post Options
Thanks(0)
Posted: 22 Jul 2014 at 11:29am |
I read about your Majestic DAC
Are this the upper limits of the sample frequencies at this inputs? I want to use TOSLINK (on a Mac) and 192kHz - this is a must have feature for me! Could the potentiometer bypassed? I don't want to use any loudness regulators in a DAC. |
|
AKG K812, K872, K712, Q701, K701, K501, K550, K271, Denon AH-D 7000
"Green" SOLO (with LME49860NA), WNA MKII Marantz SA7001 KI, Philips CD650 Revox B790, G1042, Reflex |
|
Stewboss
Senior Member Joined: 27 Jan 2013 Location: Stockton-onTees Status: Offline Points: 183 |
Post Options
Thanks(0)
|
Equipment choices:
Playstation 3 SACD, Bitzie DAC, Meridian Explorer DAC, Lautus USB cable, HD250-II, HD650 |
|
Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
Post Options
Thanks(0)
|
As the optical inputs are decoded and sent as data to the S/PDIF input of the Wolfson WM8804 tranceiver (re-clocker) and the same input is used for 192kHz coax (depending on switch position) then if the optical transmitter (on your MAC) can do 192 kHz, and it can be accomodated by our 15.5Mbps receivers (sorry, I forgot the math) then it should work.
The spec says 92kHz because that is the maximum optical sampling rate output of our test gear. -----------------------Edit-------------------- Brain fade gone... (I am in the midst of doing the quarterly accounts!)... OK, so the optical receiver does 15.5Mbps (megabits per second). The sampling rate is 192,000 Hz (192,00 times per second) and the number of bits to each sample is 24 (actually it's 20 bits of audio and 4 bits of rammel...), and there are two channels, so... 192,000 x 24 x 2 = 9,216,000 bits per second transfer rate... or 9.216 Mbps Therefore the receiver (the optical cable input) can do more than that, and so therefore will output the same. This is then read as 192/24 by the receiver (tranceiver) chip and converted to I2C and sent to the DAC chip, which can do it. If we talk quietly the Majestic will not notice that it's coming in by a different route and will process it Edited by Graham Slee - 22 Jul 2014 at 5:54pm |
|
That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
|
|
Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
Post Options
Thanks(0)
|
Second answer: THERE ARE NO LOUDNESS REGULATORS IN THE DAC
There is an analogue preamp after the DAC and in it there is a level control. There is a low level output before the level control: 309 mV nominal There is a high level balanced output after the level control: +8dBu (just under 2 volts rms) nominal The level control pot is a proper analogue control - Alps in origin - has the normal rotary tracks and wipers that preamp volume controls use. Park it where you find it best. |
|
That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
|
|
LOINER
Senior Member Joined: 18 Aug 2013 Location: LEEDS Status: Offline Points: 450 |
Post Options
Thanks(0)
|
|
|
STUART
SOLO ULTRA LINEAR DIAMOND EDITION LAUTUS DUAL MONO 1.5M INTERCONNECTS GRAM AMP 2SE |
|
FritzS
Senior Member Joined: 18 Jan 2008 Location: Austria Status: Offline Points: 134 |
Post Options
Thanks(0)
|
Could this level control Alps potentiometer bypassed?
|
|
AKG K812, K872, K712, Q701, K701, K501, K550, K271, Denon AH-D 7000
"Green" SOLO (with LME49860NA), WNA MKII Marantz SA7001 KI, Philips CD650 Revox B790, G1042, Reflex |
|
Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
Post Options
Thanks(0)
|
I could bypass it if you really want me to.
Or you could park it up at maximum so it becomes in-effect a resistor to ground with the upper connection being the wiper positioned on the end of the element. If I were to bypass it, I would have to cut the PCB tracks and rejoin them by hard wiring. The control would have to be left in situ otherwise it would look a mess having a hole and recess. It could be best to ask Suggs to send you one to ensure it does 192 optical (although it should) before you buy. The only problem I have right now is getting the European loaner Majestic to Suggs because the production staff who do those things are on vacation for 2 weeks. |
|
That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
|
|
Post Reply | Page 123 5> |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |