New subwoofer project

[davlaf]

Hi,

I just started to think about a new project: a subwoofer. My amplifier will be a 500 watts rms powered amplifier with 4 ohms charge from parts express

BASH patented amplifier technology was developed to offer extreme amounts of power without the wasted heat and energy of traditional amplifier designs. Add to this an intelligent circuit design, and you get benefits such as extremely low distortion and high signal to noise ratios. The combination of clean output and high power makes the BASH amplifiers some of the best sounding subwoofer amplifiers on the market.

Features: 50 to 150 Hz low-pass crossover, 0 degree or 180 degree phase, line level inputs, speaker level inputs, line outputs, master on/off switch, auto on.

Specifications: 500 watts RMS @ .5%THD into 4 ohm load. Signal to noise ratio 105 dB A-weighted, Dimensions: 12" W x 8" H x 3-1/2" D.

* High power output in a compact, lightweight design
* Speaker and line level inputs for connection to any stereo
* Limiting circuit prevents audible clipping and protects woofers
* Auto On/Off and phase reversal switch

...

Now I don't know which subwoofer driver I want to use. I think my choices stopped on thses ones: a pro subwoofer

Recommended for vented, sealed, and horn-loaded professional audio enclosures as a subwoofer. The driver features long-throw construction with a heavy-duty 12-spoke die-cast aluminum frame and Kevlar® reinforced paper cone. In a horn-loaded configuration, a pair of these 12" drivers can produce bass output comparable to 6 or 8 conventional 18" woofers. Also great as an automotive sub.

Specifications: *Power handling: 400 watts RMS/800 watts max *VCdia: 2.5" *Le: 1.48 mH *Impedance: 6 ohms *Re: 4.29 ohms *Frequency range: 25-125 Hz *Magnet weight: 160 oz. *Fs: 22 Hz *Sensitivity: 89.2 dB 1W/1m *Vas: 4.4 cu. ft. *Qms: 13.32 *Qes: 0.39 *Qts: 0.38 *Xmax: 13 mm *Dimensions: Overall Diameter: 12.32", Cutout Diameter: 10.98", Mounting Depth: 6.44".

* Double stacked 80 oz. ferrite magnets
* Copper voice coil on Polyimide former
* 12-spoke die-cast aluminum basket
* Kevlar® reinforced paper cone with foam cone edge
* Vented and extended core

this dual voice-coil subwoofer:

These DVC subwoofers are the most versatile drivers in the Dayton Loudspeaker line up. They were engineered to provide very good performance in sealed, vented, bandpass or even transmission line designs. The dual 8 ohm voice coils allow for use in a variety of applications and wiring configurations.

Each driver features a heavy gauge stamped steel frame, super stiff Kevlar impregnated paper cone, thick foam surround, flat progressive spider, vented pole piece, dual high power Kapton voice coils, heavy duty braided tinsel leads, rubber magnet cover, and high-quality pushbutton terminals. Made in the U.S.A. 5 Year Limited Warranty.

Specifications: (Note: All specifications are with voice coils connected in parallel.) Power handling: 350 watts RMS/per coil, 600 watts total * Voice coil diameter: 2" * Voice coil inductance: 1.81 mH * Nominal impedance: 8 ohm per coil / 4 ohm total * DC resistance: 2.69 ohms * Frequency range: 20-450 Hz * Magnet weight: 112 oz. * Fs: 21.7 Hz * SPL: 87.4 dB 1W/1m, 90.4 dB @ 2.83V/1m * Vas: 4.25 cu. ft. * Qms: 12.53 * Qes: .38 * Qts: .37 * Xmax: 15.1mm * Net weight: 18 lbs. * Dimensions: Overall Diameter: 12-1/4", Cutout Diameter: 11", Mounting Depth: 6-3/8", Magnet Diameter: 6-1/2".

and, finally, this one:

The legend continues... We took our most popular subwoofer driver and improved both its power handling and its performance. The 12" MKIII subwoofer is ideal for most home theater environments and will produce prestigious amounts of output in just about any listening room. Works great in sealed or vented enclosures, this is the woofer of choice for most rooms, offering outstanding performance and a reasonable box size.
Specifications: *Power handling: 500 watts RMS/700 watts max *VCdia: 2-1/2" *Le: 3.17 mH *Impedance: 4 ohms *Re: 3.07 ohms *Frequency range: 22-500 Hz *Magnet weight: 100 oz. *Fs: 22.2 Hz *SPL: 88.6 dB 2.83V/1m *Vas: 2.61 cu. ft. *Qms: 6.12 *Qes: .47 *Qts: .44 *Xmax: 18.7 mm *Dimensions: Overall Diameter: 12-1/2", Cutout Diameter: 11-1/8", Mounting Depth: 6-1/2".

* Power handling: 500 watts RMS/700 watts max
* Impedance: 4 ohms
* Fs: 22.2 Hz
* Xmax: 18.7 mm
* Sensitivity: 88.6 dB 2.83V/1m
* Qts: .44
* Vas: 2.61 cu. ft.

I think, they all have their advantages.


For the enclosure, I'm not decided. I don't know if I wanna build a bandpass enclosure or not. I think yeah, but I'm not sure.

Which driver would you recommend me?

Thank you,
David Lafleur

 

[JoeE SP9]

Check the Pass Labs DIY site for a very interesting subwoofer. Transmission line subwoofers may be better than anything else!
http://www.passdiy.com/

 

[davlaf]

Thanks for the fast reply, but I think I don't have enough room to have this kind of subwoofer.

Thank you,
David Lafleur