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NEW Beyma 21QLEX1600Fe QLEX Series 21" Subwoofer 8 Ohm

BeymaPart # 253-057
Model: 21QLEX1600FE

The Beyma 21QLEX1600Fe is a 21″ low‑frequency transducer engineered for demanding subwoofer systems where high output, deep extension, and low distortion are required. With its robust motor structure and advanced cooling, it is built to deliver professional‑grade performance.

Key Features

  • 4″ QUATTRO in/out copper voice coil for high motor force and thermal management
  • Maltcross® cooling system to reduce power compression under load
  • ±13 mm Xmax linear excursion and 60 mm peak‑to‑peak travel before damage
  • Weather‑treated cone with dual‑side treatment and double silicone spider for durability
  • FEA‑optimized ceramic magnetic circuit with aluminium demodulating ring to improve linearity and reduce distortion
  • Rrecommended enclosure volume of 170 liters (bass‑reflex tuned to 38 Hz)
NEW $657.00
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MSRP: $876.00
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Overview

Beyma 21QLEX1600Fe QLEX Series 21" Subwoofer 8 Ohm

21QLEX1600Fe QLEX Series 21" Subwoofer 8 Ohm

With its powerful 1,600 W AES rating and high 98 dB sensitivity, the 21QLEX1600Fe achieves substantial output while maintaining efficiency. The 4″ QUATTRO in/out copper voice coil contributes to strong motor force and effective heat dissipation, and the Maltcross® cooling system further supports extended high‑power performance. The ±13 mm Xmax and 60 mm peak‑to‑peak travel provide the physical capability for deep, controlled bass motions without distortion. The weather‑treated cone and double silicone spider add durable reliability for both indoor and outdoor systems. Featuring an FEA‑optimized ceramic magnet with aluminum demodulating ring, the driver maintains linearity and reduces harmonic distortion. Designed for subwoofer use across a 30–1000 Hz band and optimized for a 170‑liter bass‑reflex enclosure tuned around 38 Hz, the 21QLEX1600Fe is a solid choice for professional bass‑heavy sound systems.

Solid Line: On Axis
Dotted Line: 45° Off Axis

At Beyma, the challenge of heat dissipation is met with a clear objective: ensuring our speakers consistently deliver optimal performance within the system, maximizing total sound pressure level (SPL) and maintaining stability.

It's widely recognized that a system's overall SPL decreases over time due to power compression effects in the speakers. Typically, larger voice coil diameters correlate with higher power capacity; however, this also necessitates bigger motor structures to achieve high total output from the transducer.

Beyma's Maltcross cooling technology presents multiple solutions to achieve this goal. It enables the woofer to handle higher power levels with a given coil diameter, allowing for designs with smaller coils and motor structures. This reduction in size decreases weight, increases sensitivity, and maintains adequate power handling for specific applications, resulting in a total SPL comparable to that of drivers with larger motor structures.

Maltcross technology incorporates a forced convection circuit within the driver's core, effectively lowering the coil's operating temperature. Additionally, it functions as a demodulation ring, linearizing the transducer's inductance.

Product Details

BrandBeyma
Model21QLEX1600FE
Part Number253-057
UPC8435469044388
Unit of MeasureEach
Weight42.7

Product Specifications

Nominal Diameter21"
Bolt Circle Diameter20.6
Power Handling (RMS)1600 Watts
Power Handling (MAX)3200 Watts
Impedance8Ω
Frequency Response30 to 1000Hz
Sensitivity98dB 2.83V/1m
Voice Coil Diameter4"

Thiele-Small Parameters

Resonant Frequency (Fs)30Hz
DC Resistance (Re)5.4Ω
Voice Coil Inductance (Le)4mH
Mechanical Q (Qms)4.5
Electromagnetic Q (Qes)0.3
Total Q (Qts)0.28
Compliance Equivalent Volume (Vas)10.91ft³
Mechanical Compliance of Suspension (Cms)72mm/N
BL Product (BL)36.4T·m
Diaphragm Mass Inc. Airload (Mms)0.388g
Maximum Linear Excursion (Xmax)13mm
Surface Area of Cone (Sd)0.1734cm²

Materials of Construction

Cone MaterialTreated Paper
Voice Coil Wire MaterialCopper
Basket / Frame MaterialCast Aluminum

Mounting Information

Overall Outside Diameter21.5"
Baffle Cutout Diameter19.4"
Depth10.5"
# Mounting Holes8

Parts Express Staff Recommended Enclosure Volume

Sealed Volume1.228ft³
Sealed F390.81Hz
Vented Volume2.816ft³
Vented F355.64Hz

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