View Full Version : Help With TRF2215 Motor & 15" Ti Basket Dream Sub Build

01-27-2012, 08:32 AM
Ok, so I figure this is the place to ask. Going to be buying a TRF 4HP variant and 15" Ti basket (have always wanted a sub with one of these) next week.

I have a self designed and built 4^3 @ 31Hz trunk wall sealed off from the trunk completely.
Yes, I know there are gaps in the trim panels, but I caulked the bask side so they are sealed off...

My question is this, how would you set up the recone kit to get low, loud, and sound clean in my box on a Crescendo 3KWP @ .7?

This is what I put in a service request at fixmyspeaker for a quote:

8 layer flatwound 4" D1.4 voice coil (same as original TRF coil)
Dual 10" spiders
Quad sewn-on tensiles

Think this will work? I know the quad leads are overkill, but come on, this is my dream sub we're talkin about here...

Any help is greatly appreciated, thanks.

01-27-2012, 08:37 AM
This will be a daily ground pounder that might see a comp or two. Want to get back into bass race...

01-27-2012, 08:39 AM
That box sounds about perfect!

01-27-2012, 08:42 AM
Thanks. The RD Alpha/PSI sub I had in there sounded **** good!! Hit a 143.0 sealed up legal at 42Hz and 145.4 driver's door open outlaw in the kick on BME Click!! And that was on a busted *** SS RUB1.2500.

Wanted more motor and power (and the 4" coil to take it) and to see what I can really get out of my first design/build. Would like to see a 45 on music sealed up. Personal goal.

01-27-2012, 11:29 AM

nominal diameter......15in(381mm)

magnet weight...400 oz.(11,340g)

frequency response....38-200HZ

nominal impedence...2 x 1.5 ohms

DC resistance(RE)....2 x 1.4 ohms

Resonance Frequency(Fs)....38Hz

Total Q Factor(Qts).....0.27

Electrical Q Factor(Qes)....0.28

Mechanical Q Factor(Qms)...4.328

Effective Cone Area(SD)....133in^2 (0.086 m^2)

Equivalent Air Volume (VAS)....2.23 ft^2 (63.1L)

Compliance (Cms).....6.13E-05 m/N

Moving Mass (Mms)...9.95 oz(282g)

Voice Coil Diameter.....4 in (102mm)

Voice Coil Winding Width....2.42 in (61.5mm)

Voice Coil Former Material....8 mil aluminum

Voice Coil Inductance......2.92 mH

Force Factor(BL).....26.33 Tm

Linear Excursion (Xmax)....0.61 in(15.5mm)


Operating Power(PE)...2000W RMS/4000W Peak

Mounting Diameter...13.813 in (351mm)

Mounting Depth...9.3 in (236mm)

01-27-2012, 11:30 AM
Shouldn't have any trouble gettin low with my recone specs, box tuning, 3K rms, and cabin gain I think.