Quote: DM+ click sound on start should normal, it from internal relay. Start DM+ before switch on MAC and switch off MAC before switch on DM+, it is because sometime MAC can not recognize that when DM+ power, all USB use external power may affect, this problem easy come from MAC that...

$100 external usb sound card may not better that internal sound card, good laptop design will prevent noise affect the sound quality, although poor laptop will have background noise come out, try to use a headphone to test the laptop sound quality and confirm without background noise (connect...

may try CA DACMAGIC PLUS which use Anagram up sampling for real and warm, smooth sound.  

The Cambridge ASIO Driver seen no any problem on my system, both lenovo notebook (Win 7 HP) and 2008 imac (bootcamp + xp). As i know Dell is very poor connect with other devices, such as my office dell desktop computer, many usb reader can not working on.   Please try to use other...

Quote: The Switch mode power supply provided for Dacmagic Plus is look cheap  but get it work well. I tested with good linear power supply for lab use and a external audio grade power supply both found the switch mode power supply get better detail, dynamic on Dacmagic Plus.    ...

  If you mainly use USB for main source, you need a good USB asyn. DAC or USB professional sound card though signal by USB2 ASIO / special driver .  Even listen 44.1khz/16bit CD material, the sound will get much better that just most DAC that though PCM270x. For Aysn. USB transfer, good...

  It depending on your sound card and DAC quality, most consumer target expensive sound card marketing on sound quality produce not natural sound, too aggressive sound to attach people this sound card good. Most semi-professional sound card that personal can afford (said lower that 1000USD)...

I just got it about one week about 500USD at HK.   I connect with 1. WIN7 USB ASIO ON FOOBAR 2. MAC connect by firewire (Focusite 24 DSP) to digital input S/PDIF   I used as upgrade our firewire audio output and wish connect my windows laptop by USB.   monitor by  GENELEC 8020A...

Thank you. Those information very useful. I try to plan use AD8652 1pcs+AD8651 1pcs. From database, the speed and performance very good with very low THD but it need 9ma per channel. Which require 9x6 = 54ma on I/V. The current of DAC require should need about 250ma.

I try to design a USB DAC powered by usb port. We plan use PCM2707 I2S output to PCM1794 For mobile reason, i don't want powered with external source. The problem is, for I/V TI suggest use NE5534 which require +/- 15V. I try to found another good opamp worked well in usb power and no...

No updated on the thread long time. I bought a UM3 try to replace SR001 but the quality of moded sr001 is better that um3 much more. About the power. I bought 2 pcs Ultrafire Li ion battery, supply to sr001, compare as power supply and Li ion battery. The Power supply with large...

I change output cap to 4x Auricap 0.01uf 600v, need so much time for fit inside of the box because we need remain the battery room for portable use. We need sometime for run the cap, but at least this more transparent and dynamic .

After running some hour 30hr+, i believe AD8620AR is the best solution for SR-001 upgrade, i don't know how about AD8599, but AD8620 only need +/-16V provide very good sound and low voltage run for longer time on battery. If the AD8599 warmer that AD8620, i thing AD8620 should better, because...

Thank you for borisov57 and AudioCats informations. I installed two AD8620AR, i tested with following and overall current draw is: Short R35/R34 15V 360ma R35/R34 with 220ohm 12V 345ma R35/R34 with 440ohm 9.1V (the stax's default SMD resistance) 320ma I will discuss the sound after...

I ordered 2pcs AD8620, should be better that AD8599 and use lower current. Is the Opamp power supply section don't provide more that +/-12V so that i can safety use the AD8620 ?

Quote: Originally Posted by chi2 Oh, I see. Yes, I bought it new, so no energy-hungry modifications (so far ). i know why the NIMI can't be used on sr001, some battery, the polar + metal contact small cone dimension had been large, so that this can't be contact with sr001 plus...

I replayed a pair of OPA2134 and found the current is 400ma No heat generated from the opamp but i found most heat for this amp from high voltage. The dynamic is better that NE5532, the speed is faster and the sound clearer that NE5532. But the bass amount of NE5532 is more that OPA2134, but...

Quote: Originally Posted by AudioCats the output Wima caps are of different size? The output wima both some value but wima have two different size, so that i use the small side on medium. The blue one also wima 50v 3700pf bypass. After i try install the super cap box, do...

Here is the photo of mod sr-001 amp and super cap box

We changed the opamp of the sr-001 amp to NE5532FE Philips ceramic, i thing i can direct solder a DIP8 on the PCB surface but it don't have enough room for do that, so that i solder the NE5532 and connect the other four pin by wire. I changed the four power supply 10uf cap to 100uf Nichicon...

I come back and use the sr001 for more that 4mouths, and didn't work on any mod, for almost 5mouth run time, the blackgate and sr001 burn in (Acturally use 200hr) I want work on improvement because i see here so many update, and thing that the system can be improve, i real don't like the...

Is anyone use 4xNiMH battery box to SRM001 (4.8-5.6V ), will this damage for the amp.

Quote: Originally Posted by AudioCats the reason for 0.12uf (sorry, I got it wrong, should be 0.12 instead of 0.15) is that will be the largest value polyprop that can fit onto the board as a direct replacement of the original 0.15uf poly(ester?). of course you can use smaller value, I...

Quote: Originally Posted by AudioCats The first thing you should change is the opamp. If you don't want to mess with the high voltage section too much, change the C6 to a 0.1uf/630v X2 series polyprop, that will increase your high voltage reserve 10X and fits directly onto the board. It...

Thank you for AudioCat tutorial,it a very useful. I just new entry to sr-001 for few week, the module still burning, as i like to listen the change of burning. Previously, i only want to use this on my travel on night at hotel, but after use i thing this can be compare as to or better to my...