REL No.31 subwoofer
Best reference subwoofer for discerning audiophiles seeking precise, high-end bass performance.
Experience profound power and incredible speed with the REL No. 31 subwoofer. This reference model delivers devastatingly deep yet agile bass, thanks to its 12-inch pure carbon fiber driver and a potent 900-watt Class D amplifier. Housed in an acoustically inert, curved cabinet, it seamlessly integrates with high-end loudspeakers. Designed for discerning audiophiles, the No. 31 offers a truly three-dimensional, full-range listening experience, balancing immense power with refined nuance for ultimate low-frequency reproduction.
$7000.00
Owner Satisfaction
4.8
/ 5
Category Rank
20
/ 6561
#20 in Speakers
Price vs Category Average
+378%
Above average
Type
Closed box, front-firing driver
/ Closed box, front-firing driver
Who it's for
- Design-conscious homeowners prioritizing luxury aesthetics and build quality
- Audiophiles seeking seamless sonic cohesion with premium main speakers
- Listeners demanding authoritative, reference-grade low-frequency performance
Who should skip it
- Casual users wanting a simple, plug-and-play audio solution
- Budget-conscious buyers seeking high-end performance at accessible price points
- Apartment dwellers or those with limited floor space
Performance breakdown
Low Frequency Extension
Reaches down to 17Hz for visceral, room-shaking sub-bass performance.
Transient Response
Carbon fiber driver delivers lightning-fast speed and precise musical articulation.
Build Integrity
Massive, inert cabinet construction eliminates unwanted resonance and coloration.
System Integration
High-level Neutrik connection ensures perfect sonic blending with main speakers.
Dynamic Headroom
The 900-watt amplifier handles complex transients without breaking a sweat.
Room Tuning Precision
Dual parametric filters allow for surgical adjustment in difficult acoustic spaces.
Key Specs
Type
Closed box, front-firing driver
Active Driver Size & Material
12 in. (300mm) long throw, carbon fiber cone with inverted carbon fibre centre cap, die cast alloy chassis
Low Frequency Extension
-17Hz at -6 dB
Input Connectors
High Level Neutrik Speakon, Low Level (2) RCA, (1) LFE RCA, (1) LFE XLR
Output Connectors
High Level Neutrik Speakon, (1) Low Level RCA, (1) LFE XLR, (1) Line XLR
Power Output
900 watts (RMS)
Amplifier Type
NextGen 7 Class D
Dimensions
W x H x D 25 1/8 x 17 x 28 1/2 in (638 x 435 x 720 mm)
Features
- 12" pure carbon fiber driver for exceptional performance.
- 900W NextGen 7 Class D amplifier for dynamic power.
- Dual parametric filters for precise room tuning.
- Compact design for space-constrained environments.
- Vertically stackable for line array configurations.
- Seamless integration with main speakers.
- LimitLess Limiter™ for smooth amplification.
- Includes premium Reference Remote Control.
What customers say
The REL No.31 subwoofer achieves elite status due to its exceptional speed and articulation. Customers praise its ability to integrate seamlessly, providing immense depth without sounding boomy or slow. The powerful 2000-watt amplifier delivers outstanding dynamic headroom, perfect for demanding music and home theater use. Build quality is universally recognized as reference grade. The primary considerations tempering enthusiasm are the high price point, restricting it to serious audiophiles, and its substantial physical size. Despite these practical factors, the consensus is that the No.31 delivers the ultimate in low frequency performance and system integration for those seeking the pinnacle of subwoofer design.
Know before you buy
The No.31 is designed to connect directly to your amplifier's speaker terminals via the included Neutrik Speakon cable. This allows the subwoofer to receive the exact same signal as your main speakers, ensuring the bass timing and character perfectly match your system.
Yes, the No.31 is specifically engineered to be vertically stackable. This allows you to create a line array configuration, which increases output and improves the dispersion of low frequencies in larger rooms.
The 12-inch pure carbon fiber driver is exceptionally stiff and lightweight. This allows the subwoofer to move with extreme speed and precision, ensuring that bass notes are tight and detailed rather than muddy or bloated.
Yes, it features dual parametric filters that allow for precise room tuning. These controls help you smooth out peaks and dips in your room's response, ensuring a more balanced and accurate low-end performance.
Absolutely. While it excels at musical reproduction, it includes dedicated LFE inputs via RCA and XLR, allowing it to handle the discrete low-frequency effects channel in movie soundtracks with its powerful 900-watt amplifier.
The No.31 reaches down to -17Hz at -6 dB. This provides a deep, visceral foundation for both music and film, capturing the lowest octaves that many standard subwoofers cannot reproduce.
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