Digizoid ZO Personal Subwoofer
 

http://www.sharperimage.com/dyn/dyn/...f_200131-p.jpg

Not an amp per se, this device makes some rather interesting claims: http://www.digizoid.com/the-zo/

It obviously uses analog sound processing (not a DSP chip) to achieve that. One of the novel interesting features is dynamic range expansion - it claims to counteract today's dynamic-less brickwall mastering and gives the audio some more room to breathe. I'll believe it when I hear it with my own ears, but it sure sounds good on paper.

Here's a good review about it on Head-Fi: http://www.head-fi.org/forum/thread/...able-subwoofer

Hmm... do I want to own more crap, um...... maybe. So when does yours arrive so we can all hear about it from you ;-)

Damn, I thought *you* would get one and tell me about it. ;)

Do some namedropping and throw your weight around dfkt - as the biggest basshead I know, this product seems a must for an official ABi review ;)

Seriously, this device seem pretty unique in what it is claiming to offer...?

"Claiming" is the key word there, could mean marketing hype :D

The sharper images is selling it for $99.00. Not a bad price if it works good. However, the type of phones one has makes a big difference. When I listen to trance music, the bass is so deep I don't need a subwoofer.

Quite right! With my PortaPros and Clip+, trance gives me solid bass even with no EQ help.

The Head-Fi review I linked in the first post sounds convincing to me. The guy who wrote it seems to know his stuff, I would definitely like to hear if that box sounds something like Cowon's BBE or similar.

I think its probably another exciter/maximizer like BBE. I'm wondering how it sounds compared to MachBass, but I doubt it does anything truly spectacular. With this said, I'm still curious to read reviews of it.

The thing I wonder most about is how they could pull it off in the analog domain, without a DSP chip. That approach seems unusual.

EDIT: nevermind, Yuki just told me that the BBE hardware racks are analog as well, contrary to Cowon's digital BBE implementation, or the VST plugin.

Im in no way an expert on this topic but having an analogue design for an exciter does not seem all that novel to me. Haven't these devices been around since the 70s? An exciter is based on all-pass filtering, frequency compensated gain adjustment and frequency compensated domain delay. I do believe all of this can be achieved using analogue technology, right?

^ True that. Analog stuff like exciters and such have been around for guitar stomp boxes/effects pedals for decades. Just had no idea how that stuff would translate to portable amps/portable gear.

There used to be knobs and stuff ;)

I'm interested in knowing if it would do anything for the J3. The J3 really has an amazing sound (pardon me if I'm overly enthusiastic over it, I've only had it for a week now), and a great amp at that. With my M50, I really don't need my FiiO E5 anymore, as I think it doesn't really do anything for the sound quality.

However, I know that before I got me my J3, I was convinced my Sony DAP with Klipsch S4 was pretty much as good as it would get. Then I got the FiiO amp (to be honest, these three made a pretty decent match). Then I got the M50's. Then I got the J3. I guess you can see where I'm going with this.

I know you also have a J3 and similar headphones to mine, the HFI-780 (at least I think they're kind of similar). If you will be ordering the digiZoid ZO, could you please try to include the match J3 -> ZO -> HFI-780 to see if it really does anything or if J3 with BBE alone is better?

Got it today. Wow, the bass is really amazing on that thing, even surpassing BBE M3B in punch, tightness, and lack of midrange-bleed. Just the thing phones with little bass (PFE, e-Q5/7, W4, q-Jays, etc) need. And it's admirably tiny.

http://img.elektrokrishna.com/images...7058264732.jpg

http://img.elektrokrishna.com/images...9267886670.jpg

Some frequency response tests, without load. That thing sure hits deep. Interesting to notice is that it really doesn't change much above half power - the change between level 16 and level 31 is marginal, while the changes at lower settings are quite a bit more noticeable.

http://img.elektrokrishna.com/images...7443008805.png

http://img.elektrokrishna.com/images...6726019847.png

Full RMAA tests here: http://rmaa.elektrokrishna.com/index...&search_mode=f

Conclusion: no matter if low impedance or difficult multi-armature IEMs, the ZO drives them just fine, without any issues, without bass roll-off, or without frequency response roller coasters. Everything else is just fine as well.

(Some of the no load tests were with USB plugged in, to recharge - their noise level, THD, IMD, are somewhat off, due to USB being noisy - the 16 Ohm and 32 Ohm tests have no such issues.)

Let me display my ignorance rather than keep running this through my head and coming up with zero. If I have a bass neutral or light set of dynamic driver over the ear headphones this should give a clean boost in the lower frequencies?

I can do some of that by lowering the higher frequencies with a good eq. But if I can get an undistorted bass boost that would put this in the things I'd need to consider category.

It's more than an EQ, it has some psychoacoustic processing and tricks up its sleeve. It's similar to BBE Mach3Bass, but even punchier, faster, and more natural sounding (and without making a loudness curve with recessed midrange, or affecting the treble). You have to hear it to believe it - personally I couldn't manage to tweak such a bass boost with the use of a regular EQ. It even makes the Koss KSC75 (!) into slightly bass-heavy yet still very clear cans.

Additionally, it's also amping the signal a bit (about as much as a FiiO E5, I'd say) - and it still doesn't distort the bass at all, not even at highest settings, playing some nasty Dubstep tunes with really low sub-bass.

Hi dfkt,

did you try it with the SM3? any diference with and without it?

tks

Now that is amazing!