MB Quart MBQ-QA1-1500.1D Q-Series 1500 Watt Monoblock Class-D Subwoofer Amplifier in Grey

A 1500W monoblock Class-D subwoofer amplifier delivering 1500W x 1 at 1-ohm, 1100W x 1 at 2-ohm, and 750W x 1 at 4-ohm, with a signal-to-noise ratio exceeding 106dB. Features a variable electronic low-pass filter from 40Hz to 150Hz, 0-12dB bass boost, switchable 27Hz subsonic filter, Q-Stasis low-noise pre-amplifier stage, FLUID-FETS output devices, and wired bass remote. Optimised for seamless integration with the QA1-900.6DSP 6-channel amplifier. Through-glass top design with red LED accent lighting. Backed by a 2 year warranty.

Product Overview

The MB Quart MBQ-QA1-1500.1D is a 1500W monoblock Class-D subwoofer amplifier from the Q-Series range, designed to deliver high-output, low-distortion bass performance for single subwoofer or subwoofer system installations. Operating across a frequency response of 10Hz-178Hz, it is purpose-built for subwoofer duty with a variable electronic low-pass filter (40Hz-150Hz at 12dB/octave), 0-12dB bass boost, and a switchable 27Hz subsonic filter for driver protection.

The Q-Stasis pre-amplifier stage reduces incoming noise from the source unit before amplification, contributing to the amplifier's signal-to-noise ratio of greater than 106dB - one of the highest in the MB Quart Q-Series range. MB Quart's proprietary FLUID-FETS output transistors are individually selected for efficient power production and high sound quality. A MOSFET Pulse Width Modulation power supply enables efficient output without placing excessive demand on the vehicle's electrical system. Nickel-plated RCA inputs with hex screw terminals provide secure, corrosion-resistant connections. The input circuit is optimised for seamless integration with the QA1-900.6DSP 6-channel DSP amplifier via its RCA pass-through output.

An included wired bass remote allows subwoofer gain adjustment from anywhere in the vehicle without accessing the amplifier. Three-stage protection circuits monitor thermal, overload, DC, and speaker short conditions with LED indicators on the amplifier end panel. The through-glass top design with red LED accent lighting matches the visual style of the QA1-900.6DSP for a cohesive installed appearance.

Features & Benefits

1500W at 1-Ohm - High Output Monoblock Performance: The MBQ-QA1-1500.1D delivers 1500W at 1-ohm, 1100W at 2-ohm, and 750W at 4-ohm, providing flexibility to match a wide range of subwoofer impedance configurations without compromising output capability.

106dB Signal-to-Noise Ratio - Exceptionally Clean Signal Path: A signal-to-noise ratio exceeding 106dB is among the highest in the Q-Series range and reflects the effectiveness of the Q-Stasis pre-amplifier stage in reducing incoming noise before amplification. This translates to a substantially quieter background and cleaner bass reproduction.

Variable Electronic Low-Pass Filter - 40Hz to 150Hz: The variable LPF is adjustable from 40Hz to 150Hz at 12dB/octave via dial control, allowing precise roll-off tuning to suit the subwoofer driver, enclosure type, and listening preference without requiring a separate signal processor.

Switchable 27Hz Subsonic Filter: The switchable subsonic filter removes frequencies below 27Hz that cannot be reproduced by the subwoofer but can cause excessive cone excursion and driver damage at high volume levels. It can be switched on or off depending on the music source and installation requirements.

0-12dB Bass Boost - Built-In Bass Control: The built-in 0-12dB bass boost allows additional low-frequency emphasis to be applied at the amplifier without an external EQ, useful for compensating for acoustic deficiencies in the installation environment.

Q-Stasis Pre-Amplifier Stage and FLUID-FETS Output Devices: The Q-Stasis pre-amplifier stage reduces incoming noise from the source unit at the input stage. MB Quart's proprietary FLUID-FETS output transistors are individually selected for efficient power delivery and high sound quality throughout the amplification chain.

Wired Bass Remote Included: The included wired bass remote allows subwoofer gain level adjustments to be made from the driver's position or any other convenient location in the vehicle, without returning to the amplifier.

Designed for QA1-900.6DSP Integration: The MBQ-QA1-1500.1D's input circuit is optimised to work with the QA1-900.6DSP 6-channel DSP amplifier. When connected via the QA1-900.6DSP's RCA pass-through output and REM OUT function, the two amplifiers form a complete, seamlessly integrated speaker and subwoofer system.

Technical Specs

Compatible With / Goes Well With

The MBQ-QA1-1500.1D is suited to a wide range of vehicle audio installations requiring a high-output dedicated subwoofer amplifier. Its input circuit is specifically optimised for connection to the QA1-900.6DSP via that amplifier's RCA pass-through and REM OUT outputs, forming a complete matched Q-Series speaker and subwoofer system. It is compatible with single or dual subwoofer configurations at 1-ohm, 2-ohm, or 4-ohm impedance.

Goes Well With:

• MBQ-QA1-900.6DSP - MB Quart Q-Series 6-channel DSP amplifier, the primary companion amplifier for a complete matched Q-Series system. The MBQ-QA1-1500.1D connects via the QA1-900.6DSP's RCA pass-through and REM OUT for seamless integration
• Subwoofers rated at 750W-1500W RMS - contact us for a compatible subwoofer recommendation based on your impedance and enclosure configuration

Frequently Asked Questions

How does the MBQ-QA1-1500.1D integrate with the QA1-900.6DSP?

The MBQ-QA1-1500.1D's input circuit is specifically optimised for connection to the QA1-900.6DSP 6-channel DSP amplifier. The QA1-900.6DSP's full-range RCA pass-through outputs (Ch1a and Ch1b) feed a distortion-free signal to the MBQ-QA1-1500.1D's RCA input, while the QA1-900.6DSP's REM OUT function passes the remote turn-on signal so both amplifiers power on together from a single source. This allows the entire system to be tuned and managed through the QA1-900.6DSP's DSP app.

What impedance delivers the most power from the MBQ-QA1-1500.1D?

The MBQ-QA1-1500.1D delivers its maximum rated output of 1500W at 1-ohm. At 2-ohm the output is 1100W, and at 4-ohm it is 750W. For the highest output, a subwoofer or dual subwoofer configuration wired to a 1-ohm or 2-ohm load is recommended. Contact us for advice on matching your subwoofer configuration to the correct impedance setting.

Does the MBQ-QA1-1500.1D have auto turn-on?

No. The MBQ-QA1-1500.1D does not feature auto turn-on via DC Signal Sense or high-level inputs. It requires a dedicated remote turn-on wire from the source unit or, when used with the QA1-900.6DSP, the remote signal is supplied via the QA1-900.6DSP's REM OUT function.

What does the subsonic filter do and when should I enable it?

The subsonic filter removes frequencies below 27Hz that a subwoofer cannot reproduce but that can cause excessive cone movement and potential driver damage at high volume. Enable the subsonic filter for most sealed and ported enclosure installations, particularly when playing music with significant low-frequency content such as electronic or bass-heavy genres. It can be switched off for applications where extended subsonic response is desired.

What is the signal-to-noise ratio of the MBQ-QA1-1500.1D and why does it matter?

The MBQ-QA1-1500.1D achieves a signal-to-noise ratio of greater than 106dB, meaning the audio signal is more than 106dB louder than the amplifier's own internal noise floor. In practice, this results in a very quiet background hiss level, which is particularly important for subwoofer amplifiers where any low-frequency noise can be audible through the woofer cone. The Q-Stasis pre-amplifier stage is central to achieving this figure.