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Precision Devices

Precision Devices PD.154NR1

15″ bass/mid-bass driver from Precision Devices with radial neodymium motor and 4″ voice coil, intended for two-way cabinets as well as bass reflex and horn subs.

Current · Last checked: 2026-11-13

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Schematic cross-section: 15″ driver with neodymium motor Side section: on the left the motor with a compact neodymium magnet, pole piece and top plate with the air gap. The voice coil sits in the gap on its former, held by the spider. To the right the cone opens out with its dust cap, with the surround at the edge of the basket. The drawing shows the construction, not the dimensions of a particular model.
Schematic cross-section of a driver with a neodymium motor. The drawing shows the construction, not the dimensions of this model; the manufacturer has a product photo.

General data

Link to section “General data”
Type
Woofer
Nominal size
15″
Nominal impedance
8 Ω All values apply to the 8 Ω version; 4 Ω and 16 Ω are also available. Manufacturer
Minimum impedance
not available
Sensitivity
99 dB 1 W / 1 m Manufacturer
Frequency range
45 Hz – 4,000 Hz Manufacturer
Voice coil Ø
101.6 mm Manufacturer
Winding height
22 mm Manufacturer
Gap depth
11 mm Manufacturer
Flux density
1.25 T Manufacturer
Magnet
neodymium
Weight
8 kg Manufacturer
Baffle cut-out Ø
355 mm Cutout according to the baffle drawing of the manufacturer's build plan. The datasheet gives a basket shoulder diameter of 356 mm and 6 × M6 on a 395 mm bolt circle (build plan: 394 mm) – measure on the driver before routing. Manufacturer
Overall diameter
408 mm Manufacturer
Mounting depth
191 mm Sum of the depth without flange (180 mm) and the flange height (11 mm), both according to the datasheet. Manufacturer
Displacement
not available
Recommended enclosure volume
75 – 200 L Manufacturer

Frequency response according to the datasheet measured in half space in a sealed 950 L enclosure. According to the manufacturer, the Thiele-Small parameters were taken after a break-in period at 900 W and confirmed with Klippel LSI.

The datasheet additionally gives Le at 10 kHz = 0.700 mH. According to the manufacturer, the driver reaches 127.5 dB in an 85 L bass reflex enclosure with 50 Hz tuning. In the body text the product page gives an average sensitivity of 97 dB, and in the footnotes, differing from this, an 800 W break-in period and “Program 700 Watts”; we follow the newer datasheet.

What can this driver do?

Link to section “What can this driver do?”

Simulation from the datasheet values above. The suggestions are calculated, not stated by the manufacturer.

Bass reflex Calculated

The EBP is above 100 – by the rule of thumb, this points to a vented enclosure (bass reflex). This is based on an EBP of 107.

Net volume
219 L
Tuning frequency
43.5 Hz
F3 (−3 dB)
40.2 Hz
F6 (−6 dB)
36.4 Hz
F10 (−10 dB)
32.5 Hz
Sensitivity (2.83 V / 1 m)
98.8 dB
Max. SPL at 40.2 Hz
123.2 dB
Max. SPL at 80.4 Hz
125.4 dB
Xmax limits below
103 Hz
Ports
1 × 315 mm
Port area for 17 m/s
729 cm²
Max. port velocity
15.9 m/s
Port length
33.1 cm
1020501002005001k708090100110120130140Frequency (Hz)Level (dB SPL)
  • at 900 W
  • Maximum SPL (limited by Xmax)
  • Power into 8 Ω (nominal impedance of the wiring).
  • Flattest alignment: lowest F3 without the response rising more than 0.25 dB above the passband level or dropping more than 0.5 dB at 2 × F3.
  • The 17 m/s limit (about 5 % of the speed of sound) is a common rule of thumb against port noise, not a standard. Rounded port ends allow higher values.
  • Lumped-element Thiele/Small model, Half space, 1 m, chamber losses QL 7, Le as a plain inductance, no room influence. At high levels (heating, non-linear Bl and Cms) real results are lower.

Open in the designer

Thiele-Small parameters

Link to section “Thiele-Small parameters”

Small-signal parameters as stated by the manufacturer. They change with temperature and level.

Fs
46 Hz
Re
6.1 Ω
Le
1.73 mH (at 1,000 Hz)
Qts
0.4
Qes
0.43
Qms
7
Vas
158 L
BL
18.5 T·m
Mms
84 g
Cms
0.138 mm/N
Sd
897 cm²
Xmax
8.5 mm
Xdamage
not available
Vd
0.76 L
EBP
107 Hz
Efficiency η₀
3.5 %

Plausibility check

Link to section “Plausibility check”

We recalculate dependent values from the datasheet. We flag deviations above 3 %.

Recalculated parameters
CheckFormula DatasheetCalculatedResult
Qts from Qes and Qms Qts = Qes · Qms / (Qes + Qms) 0.4 0.405 consistent
EBP from Fs and Qes EBP = Fs / Qes 106.98 106.977 consistent
Vd from Sd and Xmax Vd = Sd · Xmax 0.76 0.762 consistent
Xmax, geometric Xmax = (winding height − gap depth) / 2 8.5 5.5 different definition

Manufacturers define Xmax differently. A deviation from the purely geometric formula is not an error, but shows that a different definition was used.

Power handling

Link to section “Power handling”
  • AES900 W
  • Peak power3,600 W

Notes

Link to section “Notes”

Sources disagree

  • 46 – PDF p. 2, Thiele Small Parameters and General Specifications Adopted
  • 58 – PDF p. 3, Specifications PD.154NR1 (“Resonance 58 Hz”)

The 2017 build plan states 58 Hz in the specification table but 46 Hz in its own Thiele-Small table. The current datasheet and the product page consistently state 46 Hz; we adopt this value.

Build plans with this driver

Link to section “Build plans with this driver”

Sources

Link to section “Sources”
  1. Tier A · primary source

    Precision Devices PD.154NR1 – Technical Specifications (PDF, 2 pages)

    Precision Devices International Ltd. · 2025 · accessed on 13 November 2026

    Printed © 2025, footer 241125. Found via the media library of the manufacturer’s website; the product page links the datasheet only via a button.

  2. Tier A · primary source

    Precision Devices PD.154NR1 – Product page

    Precision Devices International Ltd. · accessed on 13 November 2026

  3. Tier A · primary source

    PD-2W15-1 – 15” Bass Reflex, 2-Way Loudspeaker – 77 Ltr (build plan PDF)

    Precision Devices International Ltd. · 2017 · accessed on 13 September 2026

    Printed © 2017, drawings revision 1.0. Free for non-commercial use.