[taloyd]

Hello,

We recently got a piano, and that required a reconfiguration of the stereo and so despite how much I've enjoyed these, I have to let them go.

It's two 55 liter sealed boxes, each with a DVC 4 ohm (so in series for 8 ohms) TC-1000 (later known as the Epic series) with the aluminum cone, shorting rings, 22mm of xmax, and a strong enough motor to not need a huge box, resulting in a Qtc of 0.62 for each box.

The subwoofers are in parallel for a final 4 ohm load, and driven by a Keiga 52100 amplifier which has a 1000W RMS output at 0.1% THD for a very healthy 500 WRMS to each subwoofer. It additionally has a 25 Hz. boost, which is excellent for home theater, especially when used in conjuction with room EQ (always best to EQ down, not up, so the boost in the first place really helps with the low-end roll-off). This has a switching output stage that is nearly 90% efficient, and a linear power supply, so it weighs a solid 30 lbs. Was used externally. Amp has an auto-on that works very well - always comes on even with little signal, and does NOT turn off after a few minutes in the middle of a song/movie.

Between having two separate boxes which helps flatten out the room response (and is much more flexible than one huge box), and having basically unlimited dynamic range and extension from having so much volume displacement, this has been one of the best subwoofer solutions I've ever had. Definitely local pickup in Los Angeles only due to weight/bulk!

Per Unibox simulation software, this models at 107db at xmax at 20 Hz., and over 112db at 30 Hz. That's anechoic/without room-gain!

Looking for a pretty firm $635, which I feel is fair for this level of equipment. That's also only a bit more than the amplifier by itself new!

Driver specs (this took a long time to find):
Fs   23.00   Hz
Re   7.60   Ohm
Qms   3.90   
Qes   0.49   
Sd   500.0   cm2
Vas   97.0   l
Xmax peak   22.00   mm
Le   2.49   mH
Le2   0.00   mH
Re2   0.00   Ohm
Nominal Power   500.0   W

here's the slightly later DVC 2 ohm version of this driver, when they changed the name to Epic, and put their logo on the cone:
https://www.parts-express.com/tc-sounds-epic-12-dvc-subwoofer--293-650


Amplifier specs:
http://techtalk.parts-express.com/forum/tech-talk-forum/48015-what-to-do-with-tc-sounds-tc1000-12-sub

Cheers,
Tal

[taloyd]

Still available, but the amplifier is now the rackmount Dayton SA-1000 with one band of parametric EQ and 12V trigger - oh boy! Same price, same great deal!

However:

If one desires stereo (2 channel) bass/low-frequency reproduction, I can swap a Stewart HPA-1000 pro-audio amplifier instead of the mono/1 channel Dayton one. Amplifier puts out 500 watts RMS @ 2 ohms, so the same 1000 watts to both speakers. Amplifier is a rugged pro-audio unit, convection cooled, with a switching power supply and a 2-step class H output stage (2 voltage rails of conventional class AB). The Dayton would produce superior results (because it's mono) but if one wants stereo low frequency reproduction than I can swap for the Stewart amplifier for $100 less (so $535 for the package). Which is an even more outrageously good deal. That option would absolutely require a home theater processor though as the amplifier has no crossover or controls - not even gain controls. So a home theater/processor/mixing desk subwoofer out is required.

[taloyd]

Still available at $535 for 2 channel and $635 for mono with parametric EQ, 25 Hz. boost, 12V trigger, etc.

Happy September, everyone!

Best,
Tal

[taloyd]

If one already has amplifiers/processing - I can sell just the two passive subs without any amplifier for $435.

So:
$635 with Dayton SA1000 mono sub amp with EQ, low-pass filter, 25 Hz. boost, auto-on, etc.

$535 with pro-audio 2 x 500 Stewart HPA 1000 amplifier, no processing whatsoever - not even gain controls.

$435 just the two subs

Cheers,
Tal