My burson fun just arrived. Been playing around with it. Initially had issues with input clipping from my apogee groove dac (100% outputs 5volts). Moved it down by 8db which brings it to 2volts (also compared with nx4 line out for volume matching reference). Also made analysis with the dac of nx4dsd which is only mediocre, so I'm not posting those here.
I gotta say, the shures love a lot of current if you have enough dynamic range in the rest of the chain (dac and music). I've already run into pushing the knob near max (and that's easily 1 watt or more in peak points). So funny, that only 6 months ago I was happy powering these off of some laptop amp at maybe barely 10milli watts. The scaling is real, especially in dynamic range and intermediate modes of oscillation (low level detail). I can make out the entire noise pattern of the recording, filters used for each instrument and more. This wasn't possible with low power on the amp. The sensitivity profile of this headphone is highly non linear. Instead of just getting louder it gets sharper and more impactful with amping. I'm pushing 100x the power I used to give these and they sound about the same volume, but with a lot more impact.
Also regarding direct comparisons. I got my hd700 (you can see the other list in my old post). I'm lukewarm about them. They have got nice detail and stuff. They are very picky about amps - the 6k spike can sound nice and sparkly on one amp, while coarse resonant and annoying on another. However they are very soft and lack bite/accuracy in transients as compared to the shures regardless of amp used. I think the driver on hd700 is either just having issues producing impulse as quick as require or it is having some soft clipping artefact. I can make my shures sound like hd700 by making my dac or other filter do soft clipping. I can never make hd700 sound like srh1540. So another one bites the dust. However I do like the hd700 just because of the fact that they are easier to listen to for long sessions of relaxed listening.
Srh1540 has already slayed a lot of headphones like thx00, hd600 etc for me (wrote in my old post 2113. Page 141 same thread).
Upcoming hd800 and Sony MDR F1 comparisons. I'm lukewarm about hd800 since I've heard it before once. It's nice but didn't feel like it was accurate or anything groundbreaking. I genuinely thing the shure srh940 is overall a more accurate and higher fidelity headphone than hd800 (and measured csd do agree).
Btw on more thing. I have to say, for binaural and other live music I prefer the tone of srh940 over srh1540. Srh940 gives me a picture of how itd sound if I were at the position of the mic. Srh1540 tone feels like they took a well calibrated IPS display (srh940) and made it a little more vivid. A vague image of the eq, I've attached. I just dipped the 100-300hz region a little (all closed backs need this for occlusion compensation) and added energy around 7-9khz.
An example of binaural music:
For anyone who wants to know about the input clipping thing I described of burson fun, I'm attaching a text from a chat I made. Basically when you feed the amp, make sure your dac does 2v out and not higher.
"Was having tonnes of issues initially finally fixed. Initially I had some texture similar to some akm chips I've heard before. Dip in low treblish area, lacked bite etc.. but had too much sizzle in mid treble area. Bass was also kind of upper thickish.
After fiddling around I figured out multiple issues.
After I fixed the dac. No more wierd tonality. I just pulled the groove down by -8db. In its control panel. Returned to windows audio driver. Asio2 plugin was clipping. Keeping foobar2000 volume on 100% clips. Just pushing it down by 0.3db clears it off. Something to do with data transfer and final peak clipping (was evident in songs like why not me by Enrique where there's a thick bass hit). I've been battling multiple clipping problems lol.
I'm volume matching with nx4 as reference. For 2v I need to be -8db if my math is right (first I thought -16db since I calculated using 20logx). -8db on foobar2000 works. Or -8 on apogee groove control panel works. I think the groove control panel is directly expressed in db.
All the bite and hit I wanted are back. Just cleaner and more powerful. If you wanted to know the 8db calculation. Groove does 5v out at 100%. Amp wants 2v. 10 log ( (2/5)^2) = -7.95, which is nearly -8db
I'll try with better audio transfer protocols later. For some reason asio2 started clipping in foobar2000 for me. Maybe my virtual machine is doing weeb stuff to the rest of the memory.
New learning tho. I guess I got a clue to why my akm devices sounded that way. yum. Need to parametrize and try simulating the same."