I think maybe I or someone else should do a really good A/B comparison review of the HD-598 vs the Q701. They're both similar and price and both not too dramatically different. I used to keep saying the HD-598 is a bit fuller sounding in the mids, but now I don't think this is really true. Maybe. This is even with a neutral amp/dac.
I think about 2 months ago I got the urge to compare the 598 to the Q701 further, but lost interest since I like them both a lot. I think the HD-598 MIGHT be easier for more people to like.
I think the Q701 is slightly clearer and more detailed (not due to treble). A little less forgiving of bad tracks. I also think it's more accurate to how the recording is supposed to sound. HD-598 is, but not as much.
To my ears the Q701 has more treble (still smooth treble unless it's a bad recording) and more forward upper mids.
The HD-598 has forward mids to me, but on the Q701 they often sound just as forward. The old K702 issue with distant vocals is a thing of the past for me. Otherwise I would have kept my K501.
Bass quantity is about the same I think.I should check this.
My HD-598 is recabled with Mogami, so it's hardly a fair review. I'd much rather review it stock, but that's impossible.
When I don't want to be bother as much with my harsh/bad tracks, i'll use my HD-598. It seems to smooth over them very slightly somehow. On the Q701 they're listenable, but a few can be painful (some of Utada Hikaru's stuff is awfully harsh).
Some say the HD-598's soundstage is the best thing ever, but I don't know about that. The Q701's seems a bit larger, but actually more accurate. It's never massive or anything. I just know that the 598's imaging was pretty bad compared to even the K601. Then again I found the Q701 to have very slightly worse imaging than the K601. I think it's due to the pads and a few other things. I think the K601 has the best imaging of any headphone I own.
I posted this earlier, but I bet the Q701 with Canare and a PS1 (warm sounding) would sound pretty close to identical to the HD-598. I actually like the Q701 has the perfect amount of warmth. The K702 has a touch of warmth and it's barely noticeable until you compare it to say the DT-880. The Q701 I have is much warmer and fuller sounding obviously. Feels like a slightly more musical K702. Kind of maybe a mix of the Sennheiser HD-580 and K702. Weird, I know.
BTW if anyone wants to make the Q701 even warmer, try making a DIY Canare cable. Some may think it's a downgrade from stock cable, but it makes the Q701 even smoother sounding. Seems to take a very slight edge off the treble (which it didn't really need!). I'm using L-4E5C and it only costs less than $1 per foot. Too bad the Mini-XLRs are $7 each or so. Next week I want to make one with Mogami since I like that a bit more. Cable is cable, but there are some minor differences. Mostly when it comes to how warm/bright a headphone will be. Probably due to capacitance. The Q701 should be best with a high capacitance wire like Canare or Mogami.
I had an ALO SXC fancy pants cable for it once, but it made the soundstage too huge and the sound was much thinner. A tiny bit clearer. Mids were not as full sounding. Using Cat6 would give you the same result I think. Or silver. SXC seems better for an HD-650. SXC is silver plated copper. The stock AKG cable is actually very good unlike the stock Sennheiser cables.
I actually think Canare makes the Q701 almost TOO warm. Sennheiser fans may prefer this, but not me. It makes it a lot smoother, so that's a huge plus for me sometimes.
To sound even more dumb to the science guys, Monoprice interconnect cables are really good for the Q701. No joke
They actually are up there with the Mogami ones I made for dirt cheap.
BTW my Q701 has moved up on my favorites list ever since switching to the ODAC (from HRT MSII). It didn't actually make it any less musical or any of that nonsense. Both DACs are good though. I'm just happy that my DAC now sounds amazing with all my other headphones.
Edited by tdockweiler - 11/7/12 at 1:12pm