HiFi-Woofer With Twi by Number One


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Item Information

Top HiFi subwoofer, 2 x 150WMAX, 2 x 8Ω High-end speaker with aluminium diecast basket, dual voice coil and carbon fibre cone. A preferred size for HiFi subwoofers of highest quality in medium-sized bass-reflex cabinets or also for 3-way speakers!
Packed Quantity
1 per pack
Manufacturer Number

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Delivery Information

For UK orders we offer a Free Delivery, Standard or Next Working Day delivery service.

We have separate delivery charges for Europe, North America, Japan and the Rest of the World based on the size, weight and destination of your order.

Please view our About Delivery page for full details.

Returns & Refunds

If an item is faulty or damaged on delivery and we are notified within 24 hours we will arrange for a replacement or a refund of the item - it needs to be within this time period for us to make claims with our couriers.

If you have simply changed your mind or no longer require the item(s), you must notify us within 7 days from receiving your order. The item(s) must be in their original unused and unopened packaging and be in a resalable condition for a full refund. You will need to pay for the cost of returning the item(s) and the item(s) remain your responsibility until we receive them.

Please view our Returns & Refunds page for full details.

Full Details

Impedance (Z) 2 x 8Ω
Resonant frequency (fs)20Hz
Max. frequency range f3-3,500Hz
Rec. crossover freq. (fmax.)2,000Hz
Music power 2 x 150WMAX
Power rating (P) 2 x 100WRMS
SPL (1W/1m)91dB
Suspension compl. (Cms)0.98mm/N
Moving mass (Mms)70g
Mech. resistance (Rms)1.7kg/s
Mech. Q factor (Qms)5.12
Electr. Q factor (Qes)0.26
Total Q factor (Qts)0.25
Equivalent volume (Vas)220 l
DC resistance (Re)2 x 6.8Ω/3.4Ω
Voice coil induct. (Le)2 x 1.0mH/1.0mH
Voice coil diameter50mm
Voice coil formerKapton
Voice coil winding height17mm
Air gap height8mm
Linear excursion (XMAX)±4.5mm
Eff. cone area (Sd)343cm2
Volume displacement (Vd)155.7cm3
Force factor (BxL)9.6Tm
Reference efficiency (No)0.8%
Magnet diameter145mm
Magnet weight 42.7oz.
Mounting cutout Ø 229mm
Mounting depth 120mm
DimensionsØ 256mm
Weight 3.8kg
Rec. net cabinet volume 
  Closed35 l
  Bass-reflex60 l