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Sub Bass Driver
  • High performance sub bass driver
  • Heavy-duty cast aluminium chassis for increased rigidity
  • Double suspension system
  • B/L in excess of 29 T/m
  • Effective and versatile transducer in a variety of applications
  • Suitable for horn loaded or reflex designs
  • Well suited for use with PD 1″ and 2″ compression drivers


18" / 457.2 mm

Coil Diameter

4.0" / 101.6 mm

Power Rating

600 w (A.E.S.)

Frequency Range

40 Hz - 3.5 kHz


97.5 dB


6 mm

In addition to research and development of new products, Precision Devices are constantly using the latest technology to investigate ways of further optimising and enhancing existing products to extract the best possible performance. Further to that end, it is with great pleasure that we present the PD.188/2 Sub Bass driver.

An Upgrade of the popular PD.188, the new MkII model is constructed on our latest high-strength, 18-inch chassis design and also offers visual refinements to the high-efficiency motor system.
Optimised during the design stage using the Klippel® KA3 analyser system and verified by further listening tests ensuresTSP parameters and acoustic performance remain faithful to that of the original PD.188. Careful consideration has also been given to the PD.188/2 recone kit so that it may be used as a like-for-like replacement in both MkII and any existing MkI models.

Designed to provide superlative performance when used in either a horn-loaded or reflex enclosure where fast accurate lows are demanded. A prefect choice for upgrade or replacement situations where the capability of the PD.188/2 to drop-in and provide outstanding bass response makes it a versatile, popular and highly effective unit. Well suited for use with Precision Devices mid-range and compression drivers to produce the ultimate PD sound experience.

SKU: PD.188/2.8 Category:

Sorry, this product is out of manufacture and no longer available.

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General Specifications
TypeSub Bass Driver
Nominal Diameter18" / 457.2 mm
Voice Coil Diameter4.0" / 101.6 mm
Power Rating 1 2 *600 w (A.E.S.)
Available Impedance4 Ω/ 8 Ω/ 16 Ω
Sensitivity (1W/ 1m)*97.5 dB
Frequency Range40 Hz - 3.5 kHz
Peak Power (6 dB Crest Factor)2400 w (A.E.S.)
Resonance36.22 Hz
Voice Coil Winding Depth19 mm / 0.75"
Recommended Enclosure Volume100 - 350 Litres
Flux Density1.1 Tesla
Magnet MaterialCeramic
Magnet Gap Depth11 mm / 0.43"
Former MaterialGlass Fibre
Dust Dome MaterialPaper
Voice Coil MaterialCopper
Cone MaterialPaper
Suspension MaterialDual Fabric
Surround MaterialFabric
Thiele Small Parameters
Fs36.22 Hz
Re5.86 Ω
Le (@ 1 kHz)1.55 mh
Vas201.69 litres
Mms173.02 g
Sd1134.11 cm2
Cms111.5 µm/N
BL29.28 T/m
Xmax6 mm
Vd0.68 litres
Ref. Efficiency3.92%
EBP134.14 Hz
Dimensions & Mounting
Overall Diameter474 mm
Width Across Flats459 mm
Flange Height14.5 mm
Depth (Excl. Flange)174 mm
Magnet Diameter220 mm
Chassis Shoulder Diameter415.5 mm
Outer Bolt Circle6x M8 on 455 mm PCD
Inner Bolt CircleN/A
Shipping Information
Nett Weight15 Kg / 33.07 lb
Shipping Weight16.25 Kg / 35.82 lb
* Power compression is the reduction of sensitivity at the specified power. Higher power ratings do not necessarily give a proportionate increase in SPL therefore the maximum SPL of the driver may significantly exceed that of other manufacturers with high power ratings.

1. A.E.S. Standard (40 to 400 Hz). Program 1200 Watts.
2. A.E.S. Recommended Practice.
3. Thiele - Small Parameters follow a 600 Watt A.E.S. preconditioning period.
4. 2.83 V. Half space response measured in a 208 Litre vented enclosure.

Please note that frequency response measurements are supplied for comparison purposes only and are not a measure of the low frequency performance which may be achievable in a fully optimised system.
Frequency Response & Impedance
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