| Specification | Value |
|---|---|
| Active or Passive | Passive |
| System Type | Subwoofer |
| System Continuous Power | 400 W |
| System Programme Power | 800 W |
| System Peak Power | 1600 W |
| Max SPL @ 1m | 135 dB (Half Space) |
| Freq Range (-10 dB) | 48 Hz - 150 Hz |
| Bluetooth | No |
| IP Certification | None |
| Driver Brand | Wharfedale Pro |
| LF Driver Size | 2 x 8" |
| LF Voice Coil Size | 2.5" |
| LF Rated Impedance | Parallel:4Ω Discrete:8Ω x 2 |
| LF Power (RE:AES2-2012) | 400 W Parallel / 200 W x 2 Discrete W |
| Preset Library | Yes |
| Input Connector | 2 x 4 Pole Speaker Connector, 1 x Barrier Strip |
| Enclosure Material | Birch Plywood |
| Grille Material and Finish | Steel Black or White |
| Finish | Black or White Tough-Tone paint |
| Handles | 2 |
| Deployment | Ground, Flying |
| Pole Mount | None |
| Brackets Included | No |
| Rigging | Yes |
| M10 | 16 |
| Sensitivity 2.83 V / 1 m | Half space 103 dB |
| System Rated Impedance | Parallel: 4 Ω Discrete: 8 Ω x 2 |
| Recommended HPF = BW 18 dB/OCT. | 48 Hz |
| Transformer (T) | No |
| Included Accessory | Quick Start Guide |
| Unpacked - Height (mm) | 300 |
| Unpacked - Width Front (mm) | 740 |
| Unpacked - Width Rear (mm) | 740 |
| Unpacked - Depth (mm) | 450 |
| Packed - Height (mm) | 820 |
| Packed - Width Front (mm) | 380 |
| Packed - Width Rear (mm) | 380 |
| Packed - Depth (mm) | 530 |
| Weight - Nett (kg) | 24.4 |
| Weight - Gross (kg) | 26.5 |
GPL-28B
Dual 8" band-pass subwoofer
GPL-28B
Dual 8" band-pass subwoofer
GPL-28B is a dual 8″ band-pass subwoofer from our GPL Series, engineered to deliver tight, controlled low-frequency reinforcement for compact full-range systems in fixed installations.
Featuring dual 2.5″ LF voice coil drivers in a precisely tuned band-pass enclosure, GPL-28B offers deep, musical bass response while maintaining a discreet footprint ideal for bars, clubs, and performance venues. The cabinet supports both Discrete and Parallel operating modes, providing installation flexibility depending on amplifier configuration and desired output.
Constructed from birch plywood and finished in durable black or white paint, GPL-28B is built for long-term reliability in demanding environments. 4 pole speaker connectors and barrier strip connections ensure secure and simple integration into professional audio systems.
Handling 400 W continuous (1600 W peak) power and achieving 135 dB max SPL at 1 m, GPL-28B delivers powerful, accurate low-end performance. FIR preset libraries and EASE .gll files are available to optimise system alignment with GPL full-range models.
OVERVIEW
No accessories found.
| Name | Type | File |
|---|---|---|
| EASE Library V7.5 | Software | Download |
| GPL Series Mounting Hardware | User Guide | Download |
| GPL Series Quick Start Guide | Quick Start Guide | Download |
| GPL Series User Manual | User Manual | Download |
| GPL-12HQ / GPL-15HQ Quick Start Guide | Quick Start Guide | Download |
| GPL-28B / GPL-115B / GPL-118B / GPL-218B Quick Start Guide | Quick Start Guide | Download |
| Wharfedale Pro Preset Library | Software | Download |
| Specification | GPL-115B | GPL-118B | GPL-12 | GPL-12HQ | GPL-15 | GPL-15HQ | GPL-218B | GPL-28B | GPL-5 | GPL-5T | GPL-8 | GPL-8T |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Catch Line | 15" Single Bass-Reflex Installation subwoofer | 18" Single Bass-Reflex Installation subwoofer | 12" coaxial with spherical waveguide | 12" coaxial with Constant Directivity waveguide | 15" coaxial with spherical waveguide | 15" coaxial with Constant Directivity waveguide | Dual 18" Bass-Reflex subwoofer | Dual 8" band-pass subwoofer | 5" compact coaxial | 5" compact coaxial with transformer | 8" compact coaxial | 8" compact coaxial with transformer |
| Active or Passive | Passive | Passive | Passive | Passive | Passive | Passive | Passive | Passive | Passive | Passive | Passive | Passive |
| System Type | Subwoofer | Subwoofer | Full-Range | Full-Range | Full-Range | Full-Range | Subwoofer | Subwoofer | Full-Range | Full-Range | Full-Range | Full-Range |
| Configuration | Bass-reflex | Bass-reflex | Coaxial 2-way | Coaxial 2-way | Coaxial 2-way | Coaxial 2-way | Bass-reflex | Coaxial 2-way | Coaxial 2-way | Coaxial 2-way | Coaxial 2-way | |
| System Continuous Power | 700 W | 1000 W | 450 W | 450 W | 500 W | 500 W | 2000 W | 400 W | 200 W | 200 W | 350 W | 350 W |
| System Programme Power | 1400 W | 2000 W | 900 W | 900 W | 1000 W | 1000 W | 4000 W | 800 W | 400 W | 400 W | 700 W | 700 W |
| System Peak Power | 2800 W | 4000 W | 1800 W | 1800 W | 2000 W | 2000 W | 8000 W | 1600 W | 800 W | 800 W | 1400 W | 1400 W |
| Max SPL @ 1m | 139 dB | 140 dB | 131 dB | 131 dB | 132 dB | 132 dB | 148 dB | 135 dB | 125 dB | 125 dB | 128 dB | 128 dB |
| Freq Response (+/-3 dB) | 55 Hz - 20 kHz | 55 Hz - 20 kHz | 42 Hz - 20 kHz | 42 Hz - 20 kHz | 80 Hz - 20 kHz | 80 Hz - 20 kHz | 65 Hz - 20 kHz | 65 Hz - 20 kHz | ||||
| Freq Range (-10 dB) | 32 Hz - 125Hz | 28 Hz - 100 Hz | 35 Hz - 25 kHz | 35 Hz - 25 kHz | 25 Hz - 25 kHz | 25 Hz - 25 kHz | 25 Hz - 100 Hz | 48 Hz - 150 Hz | 68 Hz - 25 kHz | 68 Hz - 25 kHz | 53 Hz - 25 kHz | 53 Hz - 25 kHz |
| Driver Brand | Wharfedale Pro | Wharfedale Pro | Beyma | Beyma | Beyma | Beyma | Wharfedale Pro | Wharfedale Pro | Beyma | Beyma | Beyma | Beyma |
| LF Driver Size | 15" | 18" | 12" | 12" | 15" | 15" | 2 x 18" | 2 x 8" | 5" | 5" | 8" | 8" |
| LF Voice Coil Size | 4" | 4" | 4" | 4" | 4" | 4" | 4" | 2.5" | 1.5" | 1.5" | 2.5" | 2.5" |
| LF Rated Impedance | 8 Ω | 8 Ω | 8 Ω | 8 Ω | 8 Ω | 8 Ω | 4 Ω | Parallel:4Ω Discrete:8Ω x 2 | 8 Ω | 8 Ω | 8 Ω | 8 Ω |
| LF Power (RE:AES2-2012) | 700 W | 1000 W | 2000 W | 400 W Parallel / 200 W x 2 Discrete W | 150 W | 150 W | 200 W | 200 W | ||||
| HF Driver Type | Compression Driver | Compression Driver | Compression Driver | Compression Driver | Compression Driver | Compression Driver | Compression Driver | Compression Driver | ||||
| HF Voice Coil Size | 2.87" | 2.87" | 2.87" | 2.87" | 1.5" | 1.5" | 1.75" | 1.75" | ||||
| HF Diaphragm Material | Composite Titanium / Polyester | Composite Titanium / Polyester | Composite Titanium / Polyester | Composite Titanium / Polyester | PM4 | PM4 | PM4 | PM4 | ||||
| HF Exit Size | 1.5" | 1.5" | 1.5" | 1.5" | 1" | 1" | 1" | 1" | ||||
| HF Power (RE:AES2-2012) | 80 W | 80 W | 80 W | 80 W | 25 W | 25 W | 50 W | 50 W | ||||
| Preset Library | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ||
| Input Connector | 2 x 4 Pole Speaker Connector, 1 x Barrier Strip | 2 x 4 Pole Speaker Connector, 1 x Barrier Strip | 2 x 4 Pole Speaker Connector | 2 x 4 Pole Speaker Connector | 2 x 4 Pole Speaker Connector | 2 x 4 Pole Speaker Connector | 2 x 4 Pole Speaker Connector, 1 x Barrier Strip | 2 x 4 Pole Speaker Connector, 1 x Barrier Strip | 2 x 4 Pole Speaker Connector | 2 x 4 Pole Speaker Connector, 1 x Barrier Strip | 2 x 4 Pole Speaker Connector | 2 x 4 Pole Speaker Connector, 1 x Barrier Strip |
| Waveguide Type | Spherical | Constant Directivity | Spherical | Constant Directivity | Spherical | Spherical | Spherical | Spherical | ||||
| Enclosure Material | Birch Plywood | Birch Plywood | Birch Plywood | Birch Plywood | Birch Plywood | Birch Plywood | Birch Plywood | Birch Plywood | Birch Plywood | Birch Plywood | Birch Plywood | Birch Plywood |
| Grille Material and Finish | Steel Black or White | Steel Black or White | Steel Black or White | Steel Black or White | Steel Black or White | Steel Black or White | Steel Black or White | Steel Black or White | Steel Black or White | Steel Black or White | Steel Black or White | Steel Black or White |
| Finish | Black or White Tough-Tone paint | Black or White Tough-Tone paint | Black or White Tough-Tone paint | Black or White Tough-Tone paint | Black or White Tough-Tone paint | Black or White Tough-Tone paint | Black or White Tough-Tone paint | Black or White Tough-Tone paint | Black or White Tough-Tone paint | Black or White Tough-Tone paint | Black or White Tough-Tone paint | Black or White Tough-Tone paint |
| Handles | 4 | 4 | 1 | 1 | 1 | 1 | 4 | 2 | 1 | 1 | ||
| Deployment | Ground | Ground | Flying, Wall Mount | Flying, Wall Mount | Flying, Wall Mount | Flying, Wall Mount | Ground | Ground, Flying | Flying, Wall Mount | Flying, Wall Mount | Flying, Wall Mount | Flying, Wall Mount |
| Brackets Included | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ||||
| Rigging | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | |
| M8 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | ||||
| M10 | 12 | 12 | 4 | 4 | 4 | 4 | 16 | 2 | 2 | 2 | 2 | |
| Nominal Coverage (H x V) | 60° conical | 80° x 40° | 60° conical | 80° x 40° | 70° conical | 70° conical | 70° conical | 70° conical | ||||
| Sensitivity 2.83 V / 1 m | Half space 104 dB | Half space 105 dB | 98 dB | 98 dB | 99 dB | 99 dB | Half space 109 dB | Half space 103 dB | 96 dB | 96 dB | 97 dB | 97 dB |
| System Rated Impedance | 8 Ω | 8 Ω | 8 Ω | 8 Ω | 8 Ω | 8 Ω | 4 Ω | Parallel: 4 Ω Discrete: 8 Ω x 2 | 8 Ω | 8 Ω | 8 Ω | 8 Ω |
| Crossover Frequency | 1.2 kHz | 1.2 kHz | 1.2 kHz | 1.2 kHz | 2.5 kHz | 2.5 kHz | 1.6 kHz | 1.6 kHz | ||||
| Recommended HPF = BW 18 dB/OCT. | 32 Hz | 28 Hz | 35 Hz | 35 Hz | 25 Hz | 25 Hz | 25 Hz | 48 Hz | 68 Hz | 68 Hz | 53 Hz | 53 Hz |
| Transformer (T) | Yes | Yes | ||||||||||
| Transformer Taps (70 V) | 120 / 60 / 30 / 15 W | 200 / 100 / 50 / 25 W | ||||||||||
| Transformer Taps (100 V) | 120 / 60 / 30 W | 200 / 100 / 50 W | ||||||||||
| Input Connectors (T) | Barrier Strip | Barrier Strip | ||||||||||
| Included Accessory | Quick Start Guide | Quick Start Guide | Quick Start Guide, Flying Yoke | Quick Start Guide, Flying Yoke | Quick Start Guide, Flying Yoke | Quick Start Guide, Flying Yoke | Quick Start Guide | Quick Start Guide | Quick Start Guide, Flying Yoke | Quick Start Guide, Flying Yoke | Quick Start Guide, Flying Yoke | Quick Start Guide, Flying Yoke |
| Unpacked - Height (mm) | 530 | 600 | 486 | 486 | 590 | 590 | 560 | 300 | 235 | 235 | 388 | 388 |
| Unpacked - Width Front (mm) | 470 | 560 | 370 | 370 | 450 | 450 | 1065 | 740 | 190 | 190 | 280 | 280 |
| Unpacked - Width Rear (mm) | 470 | 560 | 182 | 182 | 180 | 180 | 1065 | 740 | 145 | 145 | 180 | 180 |
| Unpacked - Depth (mm) | 630 | 756 | 360 | 360 | 420 | 420 | 756 | 450 | 205 | 205 | 275 | 275 |
| Packed - Height (mm) | 620 | 690 | 576 | 576 | 680 | 680 | 650 | 820 | 305 | 305 | 480 | 480 |
| Packed - Width Front (mm) | 550 | 635 | 435 | 435 | 495 | 495 | 830 | 380 | 265 | 265 | 350 | 350 |
| Packed - Width Rear (mm) | 550 | 635 | 435 | 435 | 495 | 495 | 830 | 380 | 265 | 265 | 350 | 350 |
| Packed - Depth (mm) | 710 | 830 | 445 | 445 | 525 | 525 | 1140 | 530 | 280 | 280 | 355 | 355 |
| Weight - Nett (kg) | 32.5 | 43.3 | 22.3 | 22.3 | 27.2 | 27.2 | 76 | 24.4 | 5.3 | 6.34 | 9.8 | 12.32 |
| Weight - Gross (kg) | 36.6 | 53 | 25.9 | 25.9 | 31.8 | 31.8 | 89.6 | 26.5 | 6.54 | 7.6 | 11.9 | 14.4 |
