Ravemaster BSW 154-II

[yougo]

I would like to build a subwoofer (to support my coming column speakers) that dan reproduce the freq. band between 30 - 100 Hz with about 105 dB Max. I thought about the Ravemaster BSW 154-II, it is for sale for € 60,- at www.boxen-baustelle.de With electronic correction, it simulates very well in WinISD

Parameters:

Nom. Impedanz 4
Re (Ohm) 3,3
Fs (Hz) 20
Qms 3,11
Qes 0,2
Qts 0,19
VAS (l) 394,1
SD (qcm) 855
Mms (g) 160
BxL (Tm) 18,4
SPL (dB) 1W/1M 97
Frequenzbereich (Hz) -
linearer Xmax (mm) +/- 5,0
Induktion Le (mH) 1,85
Belastbarkeit (Watt R.M.S.) 250
Belastbarkeit (Watt max.) 650
Schwingspule
Durchmesser (mm) 63
Höhe (mm) 20
Größe
Aussendurchmesser (mm) 390
Einbaudurchmesser (mm) 358
Einbauhöhe (mm) 155
Gewicht (kg) 8,5
Plaatje:

• How will this woofer perform in comparison with other (more expensive) woofers, looking at distortion etc.
• Does anyone have experience with this brand / this kind of speakers (cheap, paper cone, small Qts)
• Is there anyone who can tell me something about the trustworthiness of these parameters? (Some company's seem to cheat with their numbers)

[simon5]

Low Fs, low Qts, very high efficiency...

If the parameters are right, this is a nice buy for sure.

I just checked in WinISD, efficiency is 94 dB/W/m, or 97 dB/2.83V/m.

I'd build a ported box, 125 liters, tuned to 25 Hz, with a 24 cm long 10 cm diameter pipe.

You could even lower the vent velocity with multiple longer pipes if box size permits it.