MCM Audio Super Budget

[Mike Gann]

Hello there, my buddy is looking for me to build him a subwoofer enclosure on a super budget. He has an amp that can supply 100w bridged 4ohm that I need to work with. Quick google search has found an 8" Kicker (yuck) or this MCM Audio woofer, that I *think* has pretty good stats and for $30 I would do it for funzies.

http://www.mcmelectronics.com/product/MCM-AUDIO-SELECT-55-2421-/55-2421

Specifications

Power capacity: 120W/240W RMS/peak

Frequency response: 25Hz ~ 1KHz

Nominal impedance: 4Ω

Voice coil diameter: 2"

Magnet weight: 47oz.

Sensitivity: 87dB W/M

Fs: 25.7Hz

Re: 3.4Ω

Le: 2.47mH

Qms: 14.0

Qes: 0.22

Qts: 0.22

Vas: 30.43 liters

Mms: 59.78g

Xmax: 8mm (one-way)

Magnet gap height: 8mm

BL: 12.99

Piston diameter: 163mm

The Qms seems to be high though, is that an issue for a ported enclosure? I've only been in car audio for a year and I'm just recently diving deeper into the parameters and what they actually do for me. Feel free to tear this woofer apart for me and or suggest a better alternative. In the meantime I'll be looking around for other variations that fit the criteria. maybe two 2ohm woofers at 50rms, is that even a thing?

[all4spl]

This might be viable and its pretty cheap. http://www.parts-express.com/lanzar-maxp84-8-800-watt-woofer--292-2592

[Mike Gann]

That resonate frequency is 60hz though, was hoping to find a sub-woofer. RMS is 800 as well, I don't really have the available power to reach that but is that an issue? If it isnt then that opens up to so many more to look through. I did come across these though.

http://www.parts-express.com/re-audio-rex8-v2-8-subwoofer-driver-4-ohm--268-8050

http://www.parts-express.com/re-audio-rex10-v2-10-subwoofer-driver-4-ohm--268-8051

Although getting pricey for him, I see a lot of RE around.

I think you have the right idea though, I should be sorting by price more then power handling

[reedal]

Out of curiosity, why did you say yuck to kicker? While you can get the same or a little better for less money, kicker does exactly what is advertised. It's reliable, as long as you don't give their speakers/woofers more than they're rated for.

[Mike Gann]

Kicker's fine, I'm just not a fan of brand names that you can find at your local walmart. Fosgate and Kicker are probably my favorite out of those popular brands. but like I said I need to be staying in budget so it doesnt even matter.

[Triticum Agricolam]

I used several of those MCM 55-2421 subs. I've only used them in bass horns, but they should work OK for ported boxes. .6 cubes each tuned to 33 Hz should work reasonably well. I know those subs are pretty popular with folks looking to experiment for cheap.

If you wanted to step up a notch in quality I'd go up to an Infinity 860W. I've used several of them as well and I think they are the best you can get in that price range. If you shop around you can probably get them for under $50.

[all4spl]

http://www.ebay.com/itm/Pyle-8-Inch-800-Watt-Dual-4-Ohm-Subwoofer-PLPW8D-Car-Audio-Speaker-System-New-/360984780383?pt=LH_DefaultDomain_0&hash=item540c5e9e5f

After some digging it has an Fs of 46Hz.

http://www.ebay.com/itm/New-Planet-Audio-AC8D-8-1200w-Dual-4-OHM-Car-Subwoofer-Poly-Injection-Cone-Sub-/391093552403?pt=LH_DefaultDomain_0&hash=item5b0efe0513&vxp=mtr

Fs of 39Hz

Im still looking for an SVC 4ohm.

[all4spl]

http://www.ebay.com/itm/Precision-Power-SN-8-Sedona-600-Watts-8-Single-4-ohm-Car-Audio-Subwoofer-New-/151518903333?pt=LH_DefaultDomain_0&hash=item23473afc25&vxp=mtr

SVC 4ohm, Fs of 47Hz

http://www.ebay.com/itm/Kicker-8-Inch-Competition-Subwoofer-Stillwater-05C84-ORIGINAL-/261897877681?pt=LH_DefaultDomain_0&hash=item3cfa5478b1

SVC 4ohm, FS of 40Hz

[Mike Gann]

So what you guys are saying is that my 100w rms limitation isnt an obsticle in this?

[all4spl]

Under powering a sub will not hurt it, as long as you don't crank the gain and clip the amp.