SWR 308
308 SWR 51 147 NX ALP 4L 4 ohm    -    Order ID: 830515

By introducing the new range of Xtra Long Stroke (XLS) subwoofers, Peerless has pushed the performance limits for subwoofers. The 12" XLS/subwoofer will fulfil every demand for deep clean bass reproduction in sealed cabinets from 22 liters.
In the design the emphasis has been put in achieving extreme deep bass, long time reliability, high power handling, and very low distortion - also under very large sound pressures.
The 12" XLS car subwoofer driver has been designed with a specially compounded strong rubber surround that has the strength to withstand the high pressures inside a small sealed box. The magnet is covered with a rubber cover engraved with the XLS logo. For reliable connection to the amplifier gold plated push terminals are fitted.

 

 

 

 

SWR 308

 

 

 

 

 

 

 

Thiele Small parameters:

 

 

Free air

Common

Baffled

 

 

Nominal impedance

Zn

(ohm)

 

4

 

 

 

Minimum impedance/at freq.

Zmin

(ohm/Hz)

 

2.2/115

 

 

 

Maximum impedance

Zo

(ohm)

 

28.9

 

 

 

DC resistance

Re

(ohm)

 

1.8

 

 

 

Voice coil inductance

Le

(mH)

 

1.9

 

 

 

Capacitor in series with 4 ohm
(for impedance compensation)

Cc

(F)

 

34

 

 

 

Resonance Frequency

fs

(Hz)

28.2

 

28.2

 

 

Mechanical Q factor

Qms

 

4.81

 

4.81

 

 

Electrical Q factor

Qes

 

0.32

 

0.32

 

 

Total Q factor

Qts

 

0.30

 

0.30

 

 

F (Ratio fs/Qts)

F

(Hz)

 

 

94

 

 

Mechanical resistance

Rms

(Kg/s)

 

4.37

 

 

 

Moving mass

Mms

(g)

118.5

 

118.6

 

 

Suspension compliance

Cms

(mm/N)

 

0.27

 

 

 

Effective cone diameter

D

(cm)

 

24.4

 

 

 

Effective piston area

Sd

(cm)

 

466

 

 

 

Equivalent volume

VAS

(ltrs)

 

80.5

 

 

 

Force factor

Bl

(N/A)

 

10.9

 

 

 

Reference voltage sensitivity
Re 2.83V 1m at 115 Hz (Measured)

 

(dB)

 

 

93.5

 

 

 

Magnet and voice coil parameters:

 

 

 

 

 

 

 

Voice coil diameter

d

(mm)

51

 

 

 

 

Voice coil length

h

(mm)

33

 

 

 

 

Voice coil layers

n

 

4

 

 

 

 

Flux density in gap

B

(T)

1.04

 

 

 

 

Total useful flux

 

(mWb)

2.50

 

 

 

 

Height of the gap

hg

(mm)

8

 

 

 

 

Diameter of magnet

dm

(mm)

147

 

 

 

 

Height of magnet

hm

(mm)

35

 

 

 

 

Weight of magnet

 

(kg)

2.42