Edit: All of this was likely due to my user error (bad subwoofer placement initially in a really bad null zone), which perhaps confused GLM to make things worse (?). Either way, it's now performing exactly as I had hoped it would from the specs, which means I am happy As far as I can tell now, the sub is performing realistically to the SPL specs Genelec quotes on their site. Yes, other subs outperform them for lower price, but not to the extreme degree that it seemed earlier, which was my fault for placing them in a bass null, not Genelec's fault! So please don't read this as a negative on Genelec's subs any more.
Initial impression on Genelec subs: I ordered a Genelec 7350A to add to my very small room to fill in the lower octave below my 8351B’s.
Unfortunately, for $1260 this subwoofer is very disappointing and so is Genelec’s calibration software.
1) Genelec’s setup process does not appear to calibrate level of the subwoofer vs speakers. I had to use REW to do this manually, and ended up having to set a -15db level on both the main speakers for the subwoofer to measure flat with them.
Note also that this is with a 50hz crossover, so the 8351B’s are already handling as much of the bass as the software allows me. Using a 80hz crossover was extremely distracting since just like any subwoofer I’ve ever owned in any room I’ve ever tried this, the subwoofer is extremely obviously localizable with an 80hz crossover due to the slope being gradual leaving plenty of content up around 200hz.
2) Even in this small room, the subwoofer clips really early. This subwoofer just cannot do “loud”. I realize it’s just an 8” ported subwoofer, but seeing the SPL measurements on Genelec’s website, I expected more. It looks like they measure at a rather high frequency for a sub. I also hear a lot of port noise and distortion, probably because it’s being pushed near its limit.
In fact, I suspect that my 8351B’s actually do bass better than this 7350A sub does.
For $1260, this subwoofer doesn’t even come close to touching the power or low distortion of my lower priced Rythmik F12. I didn’t really think it would compete, but I didn’t think it would run into headroom issues so quickly in the small room I have it in.
I‘d even be willing to pay a premium for Genelec’s larger more powerful sub if I could justify it with software or compactness. But I find the software quite lacking vs e.g. miniDSP SHD’s Dirac Live. And, this sub is about the same size as the Rythmik F12 which completely dominates it in every way (power, distortion, deep bass extension, price).
Don’t get me wrong: Genelec makes fantastic speakers. Even for the high price, I don’t know if much beats the 8351B’s. But when it comes to subwoofers, I am very disappointed.