Gene i thjnk he was sayi g that the svs distortion sweeps were done at 105db and the velodyne distortion sweeps done at 115db?
I have Epik Conquest, (18" portesd sub) which has solid output down to 12Hz with distortion of less than 4%.
and the actual ground plane measurements are where?
Besides that... what are the physical dimensions of the conquest?
Now that is a sub with quality output. It is no longer manufactured, but it cost $1,600 couple of years ago.
good su or no...Maybe there's an economical reason it is no longer produced by epic.
I am sure that there are other high quality subs out there that outperform Velodyne at a fraction of the cost - i.e. JTR, Submersive, etc
Outperform in which way? prpbably not WAF....especially with four in a living room...
.. is it distortion at infrasonic frequencies that is significantly different in a real room where fundamentals can be boosted significantly (on the order of tens of db) while harmonics are not boosted?
... is it sub 10hz performance which is the holy grail of HT? Because tuning a vent to be wide and long enough with adequate bandwidth would be quite the feat. A passive radiator will work better but is still limited by its volume displacement and beyond that point can have serious mechanical noise. it's probably the best bet if only ~12hz is necessary but also remember that this speaker will weigh 3-4 times as much as it probably require heavy bracing if it is expected to play higher in frequency, and require lots of internal volume for adequate efficiency. and below its given tuning point, combined with protection circuits and natural rolloff you're looking at 48 to 60db/octave rolloff.
So it comes down to sealed subs. the submersive might be great... but where are the measurements?????? what kind of throw/extension do its higher efficiency 15" woofers have?
.. is it subjective sound quality...? How do we define this? How do we identify this in a room where frequency response is dominated? Or do we listen outdoors which is not a real world scenario? Do personal preferences matter?
Look, I think the JTR and Seaton and SVS and Epik and HSU and Rythmik products fill their own niches ;;;very;; well but I don't think you understand that every product will have its own individual issues. The velodyne isn't the right thing for a lot of us. But what it does it does well - excellent dsp limiting, deep 10hz extension, and relatively small size - are big things to some people. Don't get too caught up in distortion numbers at very low frequencies / high spls because they show us some things that may not be audible in a real room... pay them mind but don't dwell on them. the linearity / power compression test and the subjective note that the sub made no mechanical noises are the main things to look at. the sealed sub also stays within one cycle in its decay whereas the vented subs fail to do so eventually... though again at infrasonic frequencies that too is less relevant.
Measurements are fun but if you can't correlate them to your perception then it's just silly to harp on em. The CEA standards do exist as a guide for what is considered acceptable. There's dozens of tradeoffs you need to be ready to make. Use the review as a guide for whether the product appeals to you and if not move on. It's a LOT more info than you'll get from some guy on avs sticking a sub in a corner with zero eq and then comparing it by memory.
I trust Josh's analysis both subjectively and objectively - his sub setup with quad Re XXX is like my dream system along witb warpdrv's so I think he knows what he's talking about when he gives this sub an extreme room rating.
