DIY Subwoofers - General Discussion

**bigdoggy** · **10-05-09, 08:58 PM**

Ok, i am looking to do a dual sub build for my HT. Here is what i got.
2 x TCsounds 3000 subs
Crown CTS 3000 amp to power them
Velodyne SMS-1 for eq.
So, like i said, only build two other subs before so still a newb as far as that goes.
Sealed, thinking of enclsure to be 2x 3/4" walls for a 1.5" total without internal bracing.
will this work well enough? internal size in cube form? Eg. 21" LWH
stuffing, poly fill pillow stuffing? or something like that? and about how many pounds needed?
Sorry for the really vague terminology and appologize if i have forgotten something, any ideas would be much appreciated! Thanks

**Mike P.** · **10-05-09, 09:02 PM**

Quote:

2 x TCsounds 3000 subs

12 inch or15 inch? Can you post the T/S parameters?

**bigdoggy** · **10-05-09, 10:37 PM**

They are the 15" subs.... and even though they are new with the 3hp neo motors, i do not know where to find the parameters.....

**bigdoggy** · **10-05-09, 10:44 PM**

One more quick thing, the SMS-1 will control 3 subs and i currently have a Tumult MKII in a sealed enclosure, should i consider running it higher in around the >40 to 50hz to 150? and keep the two TC's crossed over at 80 or even 60hz and lower? hope that makes sense.

**Mike P.** · **10-06-09, 12:12 AM**

Found a build in the Database with this sub that is 3.5 cu.ft. sealed, it turned out well.

http://www.hometheatershack.com/forums/diy-subwoofers-sealed-ported/5778-sealed-tc-3000-ep2500-bfd-project-start.html

As for crossing over the subs, I would personally start with all 3 at 80 hz and see how it sounds, adjustments can be made from that point.

**Ricci** · **10-06-09, 10:50 AM**

Since you have neo motors I assume that you got these drivers from RobotUnderground? They will not have the same properties as the TC3K exactly. Did RU have any parameters for them? Either way it's hard to mess up on a sealed box too bad so that's a good choice. 3cu ft is probably a good guess at a volume to use. Polyfill pillow stuffing is fine.

I would not try to use the Tumult for an MBM. They are not known for having a good top end response due to the inductance. They are best at the lower stuff. Run them all the same would be my suggestion too.

**ec114** · **10-06-09, 12:43 PM**

Quote:

Ricci wrote:

I would not try to use the Tumult for an MBM. They are not known for having a good top end response due to the inductance. They are best at the lower stuff. Run them all the same would be my suggestion too.

I thought the high inductance was only a problem with the MkI, and that MkII corrected that? Not sure, which is why I ask...

**Ricci** · **10-06-09, 01:30 PM**

It helped out, but it's still not a good MBM candidate IMO.

**bigdoggy** · **10-06-09, 02:42 PM**

Excellent, i was kind of hoping at those types of figures. So will do (2) 3.0 cuft sealed boxes with the poly fill stuffing. Hoping to start next week. anxious to see how all these things come together. I hope the Crown CTS3000 works out well too. It should push them easily enough. As for configuration, i was thinking of the two TC's upfront, and the tumult in the rear. Set my EAD TM8000 processor crossover to 80hz, and hopefully the SMS-1 which can handle 3 subs can do the rest for me. Sound right? Now for the sealed enclosures, can i do both boxes in a 1.5" thick walls and no bracing or better off with a 3/4" design with bracing and 1.5" front baffle as in the design build noted above? also, does it matter how much stuffing i use?
thanks!

**spanish68** · **10-06-09, 04:07 PM**

I have a TC 3K 15" sub I'm now using in a passive radiator box of 7cf. Before that, it was in a 4cf sealed box. The TC 3k strenght is low bass, above 60hz it drops off quite a bit (mid-bass is not its strenght). I would do the crossover right at 50hz or 60hz (not above that). The 3cf sealed box would work fine for it and 1-lb of polyfill per cubic feet for your box size should do the trick (3-lbs). Good luck!

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