Jodet
1000+ Head-Fier
Don't have L700, but have next closest thing in an L700 modded L300 Limited. Started off with SRM-323S then went to Mjolnir SRD-7 transformer + NAD C275BEE stereo amp based setup because already had the amp in use for my HT mains. Noticeable improvement in low end subbass impact, midbass punch, fullness of sound, and smoothness while everything else pretty much stays the same for clarity, detail, speed, etc... Brand new the NAD C275BEE amp runs ~$1,300 and Mjolnir SRD-7 around $740 shipped. Will just need some way to control volume better than the rear gain adjustment - I use the RME ADI-2 DAC for preamp volume control.
Pics:
https://photos.smugmug.com/Hobbies/Audio/n-6fh3fz/i-kPqJXCR/0/7342bfef/X4/i-kPqJXCR-X4.jpg
https://photos.smugmug.com/Hobbies/Audio/n-6fh3fz/i-rpBHwSn/0/83849f46/X4/i-rpBHwSn-X4.jpg
https://photos.smugmug.com/Hobbies/Audio/n-6fh3fz/i-T9FXhnN/0/43de842a/X4/i-T9FXhnN-X4.jpg
I think any decent 2 Channel stereo amp used with a Mjolnir Audio SRD-7 will be a noticeable improvement over the SRM-323S/353X for much less than the specialized custom STAX amps.
Interesting - I've wondered about the Mjolnir energizer. I tried a Woo WEE once and hated it. But I do have a nice Hegel integrated I could hook the Mjolnir energizer to. Or maybe get the Mjolnir Octave III power amp and us the Hegel as a preamp.