MINT Definitive Technology Powerfield Supercube III 8" 650W Subwoofer - $500 (Medford)

MINT Definitive Technology Powerfield Supercube III 8" 650W Subwoofer 1 thumbnailMINT Definitive Technology Powerfield Supercube III 8" 650W Subwoofer 2 thumbnailMINT Definitive Technology Powerfield Supercube III 8" 650W Subwoofer 3 thumbnailMINT Definitive Technology Powerfield Supercube III 8" 650W Subwoofer 4 thumbnailMINT Definitive Technology Powerfield Supercube III 8" 650W Subwoofer 5 thumbnail
condition: like new
make / manufacturer: Definitive Technology
model name / number: Powerfield Supercube III
size / dimensions: 10x10x11

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The second, "naked" picture is a stock photo, the rest are the actual item for sale (I didn't want to stretch/wrinkle the grill cloth on this one to show what's under it).

Cash only, pick up in Medford. Price is firm, this sub sold for $1600 and is practically brand new (actually better than new with the repair/improvement that was made, detailed at the bottom of the listing). Even just in "excellent" or "very good" condition, this model sells for $300 to $400 or more (plus shipping and tax, putting you probably above $500). Then you'll end up shelling out another $200 to $300 for the necessary repair as it is almost guaranteed they've at least started to have the problem, and hope the repair shop uses high quality components. That repair with high quality components has already been made to this one, plus the physical condition is nearly flawless.

I'm selling off a fairly large personal collection of stereo and home theater stuff. I am working on getting pictures and listing everything, but if there is something you're looking for, let me know. I have lots of speakers (from tiny 5.1 setups to large towers), subwoofers, receivers, preamps, amplifiers, and some accessories like stands, wall mounts, cables, speaker wire, etc. Can put together a package deal on a full system.

I also have a couple high quality Audioquest shielded, gold plated subwoofer cables, which is a worthwhile investment for a sub of this caliber.

I know there is a lot of text below. If you want the super short version - This sub is in like new condition, very low hours of use, works perfectly, and sounds AMAZING. A minor (but critical) design flaw present on all of this model sub has been professionally repaired/resolved and it should give you many years of enjoyment. But if you're going to drop this kind of money on a sub, you should at least skim below to see all the benefits you're getting, or alternatively google "powerfeld supercube III" and check out the Crutchfield page on it with details and 5 star reviews (many other sites also with rave reviews too).

Long winded version -

I am in the process of renovating my house and just don't have the space or time to enjoy this sub, otherwise it would not be for sale. And honestly, being in the upstairs of a 2 family, I'm afraid to use it when the neighbors are home as it probably rattles everything in their place even at low volumes. So sadly, I need to let it go. This is one of the items I wanted to keep from my collection for use with my main 2.1 stereo setup, but having it sit in storage unused is a waste.

This sub is in perfect operational condition, and I'd give it a conservative 9.5 out of 10 cosmetically. Everything is flawless and only if you look very close under bright lights can you see any signs that it isn't new out of the box. The grille cloth is tight with no wrinkles/tears/holes, top is smooth, shiny high gloss piano black, and the unused inputs even still have the protective rubber covers over them.

This sub really is amazing. I've never heard so much deep, powerful bass out of such a small package (about 10"x10"x10" cube). It has a 650 watt RMS Class D high current digital amplifier (the output transistors are rated for a massive 200 amps total), a forward facing 7.5" long throw woofer with huge magnet and rigid cast basket (frame). Then two sideways facing 7.5" passive radiators (these are driven by the pressure inside the enclosure created by the main woofer). The sealed enclosure with passive radiators gives the output of a larger ported sub while keeping the tight, accurate, controlled bass of a smaller sealed sub. The sideways facing radiators also help fill the room with bass from multiple directions. All enclosed in an extremely thick and internally braced enclosure that has no vibration or resonance and wont flex under the powerful movements of the woofer.

I mostly listen to music and found it to be incredible sounding, then I watched a movie with it for the first time and was utterly blown away at the sound coming out of it. Look up reviews of the sub and you'll find they all use words like "astounding", "amazing", "astonishing", "incredible", "shocking", etc etc. This is by far the best sub I've ever owned, and I just can't use it, it's actually too good for my situation.

Now, if you are familiar with this model or do research on it, you'll know that there was one flaw in the design that caused nearly all of them to stop working after a couple of years. Then Definitive would send out a replacement part, which would then fail again after a couple years since it used the same components. The potentiometers (adjustment knobs) they used on the preamp portion failed prematurely (likely from heat) and caused the subs to have no output. A stupid 50 cent part rendered a ton of $1600 subs useless. That happened to this sub after under 2 years of light use, which is pretty typical.

The issue has been totally resolved on this unit, all 3 potentiometers were replaced with the highest quality Bourns brand potentiometers you can get (Bourns are used in high end guitars, amplifiers, lots of musical equipment, etc). Huge step up from the Alpha (Taiwan) ones used originally, and the Bourns have much higher temperature and durability ratings. Beware of any of this model that has not had all of the potentiometers replaced with a different (better) brand, at least one of them will most certainly be already dead (so your crossover and/or phase control won't work) and the others will follow eventually resulting in no output at all. This sub only has about 2 hours on it since those parts were replaced, and very low hours before that too.

Main Specs:
7.5" long throw woofer with oversized magnet
Two sideways facing 7.5" passive radiators
650W digital amplifier
16-200hz frequency response
Volume control
Continuously variable 40-150hz crossover
Continuously variable 0 to 180 degree phase adjustment
Auto on/off
Two pairs of line level inputs (LFE for surround sound receivers with dedicated sub output, and standard stereo ones for 2 channel receivers)
Gold plated Speaker level inputs with 5-way binding posts
Gold plated Speaker level outputs with built in 80hz crossover and 5-way binding posts
Piano gloss black finish
2" thick reinforced enclosure for vibration/resonance free bass
4 adjustable sound isolating feet

Details from their brochure:

Ultra-compact subwoofer delivers big bass
Definitive's smallest subwoofer, the SuperCube III provides huge bass performance in a compact, room-friendly enclosure that takes up less than a cubic foot of floor-space. The secret to its success is an active woofer/passive radiator combination that produces big sound despite the cabinet's small size. And a powerful built-in 650-watt amplifier really shows off this little sub's tight, accurate bass response.

A unique approach to rock-solid bass
The SuperCube III contains a 7-1/2" woofer pressure-coupled to two 7-1/2" passive radiators, for a total output around that of a traditional 12" woofer. This driver array gives the SuperCube III the advantage of far greater speed, musicality, and control than any large single-woofer sub could produce. The woofer is encased in an incredibly rigid basket engineered to hold the massive magnet structure and large voice coil in absolute alignment. The non-resonant cabinet is nearly 2" thick and uses multiple internal bracings to make sure that you hear clean bass without sound-muddying vibrations.

Flexible inputs and outputs and advanced controls
Line-level and speaker-level inputs let you connect this sub to just about any audio system. The continuously variable low-pass crossover allows you to precisely control the frequencies that your subwoofer handles. And the built-in high-pass crossover is a nice touch: it prevents your main speakers from overloading with low frequencies if you hook them up through the subwoofer's speaker-level outputs.

post id: 7750412959



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