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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
Type Sub Bass Driver
Available Impedance 4 Ω/ 8 Ω/ 16 Ω
Nominal Diameter 18" / 457.2 mm
Voice Coil Diameter 4.0" / 101.6 mm
Peak Power (6 dB Crest Factor) * 2400 w (A.E.S.)
Power Rating 1 2 * 600 w (A.E.S.)
Sensitivity (1W/ 1m) * 97.5 dB
Frequency Range 40 Hz - 3.5 kHz
Resonance 36.22 Hz
Voice Coil Winding Depth 19 mm / 0.75"
Recommended Enclosure Volume 100 - 350 Litres
Flux Density 1.1 Tesla
Magnet Material Ceramic
Magnet Gap Depth 11 mm / 0.43"
Former Material Glass Fibre
Dust Dome Material Paper
Voice Coil Material Copper
Cone Material Paper
Suspension Material Dual Fabric
Surround Material Fabric
Thiele Small Parameters
Fs 36.22 Hz
Re 5.86 Ω
Qms 13.04
Qes 0.27
Qts 0.26
Le (@ 1 kHz) 1.55 mh
Vas 201.69 litres
Mms 173.02 g
Sd 1134.11 cm2
Cms 111.5 µm/N
BL 29.28 T/m
Xmax 6 mm
Vd 0.68 litres
Ref. Efficiency 3.92%
EBP 134.14 Hz
Dimensions & Mounting
Overall Diameter 474 mm
Width Across Flats 459 mm
Flange Height 14.5 mm
Depth (Excl. Flange) 174 mm
Magnet Diameter 220 mm
Chassis Shoulder Diameter 415.5 mm
Outer Bolt Circle 6x M8 on 455 mm PCD
Inner Bolt Circle N/A
Shipping Information
Nett Weight 15 Kg / 33.07 lb
Shipping Weight 16.25 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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