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Author Topic: M 248 w external battery  (Read 5672 times)

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Offline ccage

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Re: M 248 w external battery
« Reply #15 on: September 23, 2017, 12:34:05 AM »
Doug has upgraded my 248 further w/ better DC converter and EQ chip in addition to the external 12v supply.
Guess we can call it the M248 mkII!
Will take it out for test drive next weekend at DBT shows in ATL - Doug said some of you have reached out about this project and the 148 project so
hopefully will have positive results.
Internal/External battery combo should get me about 10-11 hrs.   

Here's email from Doug:
Chris, I decided to replace the +/- 12 volt converter
 and the EQ chip. They are the only parts common to both
 channels. I saw the converter drop to +/- 10.5 volts, not
 enough to cause output to drop but enough to tell me
 it's on its way out. I used a new chip that I like a lot
 for the EQ circuit. It has the ability to generate a more
 impressive 3D soundstage. I'm going to leave the M248 on
 for a while but I feel good about it now.
 I'll let you know and thanks for your patience....Doug
 BTW, I'm now working on making the M148 power
 system more efficient.
Schoeps CCM 41V, MK4, MK41, NBob Schoeps Actives, JB Mod Nak 300>cp103, JB Mod PFA Nak cp104, Naiant Active>AKG CK 63 combo,   
Oade m248mkII  Audioroot Femto
SD 744
Darktrain cables-tgakidis cables/bar
followinbob clips/risers/bars-Naiant PFA's-Nbob Actives


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