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Dynaudio Sub 3 Active Subwoofer at Vinyl Sound Buffalo, NY USA

The Sub 3 is a 300W active sealed subwoofer from Dynaudio (Skanderborg, Denmark), available at Vinyl Sound in Buffalo, NY, USA. Designed to work equally well in stereo music and multichannel home cinema systems, it uses a single 23cm MSP woofer in a compact sealed enclosure with a 37mm double-thickness curved front baffle derived from Contour series cabinet engineering. Frequency response extends from 22 Hz to 175 Hz at +/-3 dB, with an adjustable low pass filter from 50 to 150 Hz and a high pass filter at flat, 60 Hz, or 80 Hz for satellite speaker integration. The Sub 3 carries the full DSP feature set of the larger Sub 6 in a cabinet footprint matching the previous Sub 250, including 0/180 degree phase adjustment and a slave output for daisy-chaining a second unit.

23cm MSP Woofer, 300W Amplification, and Contour-Quality Cabinet Construction

The Sub 3's 23cm MSP (Magnesium Silicate Polymer) driver is a new design built specifically for this subwoofer, using Dynaudio's proprietary cone material developed in-house and refined across decades of use in the company's full loudspeaker range from Emit to Confidence. MSP provides the precise combination of low mass, controlled stiffness, and inherent self-damping needed to reproduce bass frequencies with accuracy and transient speed rather than the boom and overhang that insufficiently damped subwoofer drivers can produce. The 300W amplifier module is the same power class as the larger Sub 600 predecessor, giving the Sub 3 the dynamic headroom to keep pace with demanding Contour and Confidence speaker systems at high listening levels. The cabinet borrows the 37mm double-thickness front baffle from Dynaudio's Contour series cabinet engineering, a significantly more rigid construction than the standard 18mm MDF used in most subwoofers at this size and price point. The additional mass and thickness of the front baffle reduces mechanical energy from the driver from coupling into the cabinet panels, lowering cabinet colouration and keeping bass reproduction clean and defined. The sealed enclosure design provides tighter transient bass response and more natural decay compared to ported alternatives, optimising the Sub 3 for music listening as well as cinema use. At 266mm wide, the Sub 3's footprint matches the previous Sub 250, making it a direct upgrade path for existing Dynaudio system owners without requiring repositioning or furniture changes.

Signal Routing, Crossover Controls, and Stereo System Integration

The Sub 3 addresses one of the most common challenges in subwoofer integration: how to add a subwoofer to a stereo amplifier without a dedicated subwoofer output. Its dual RCA stereo inputs and satellite RCA outputs allow the signal to pass through the Sub 3 from source to amplifier while the sub takes a parallel feed, creating a complete low-frequency extension path with no requirement for a dedicated LFE output on the amplifier. An LFE RCA input is also provided for AV processor integration. The high pass filter at flat, 60 Hz, or 80 Hz lets satellite speakers hand off their low-frequency load to the Sub 3 at the selected crossover point, improving the midrange clarity of smaller speakers by reducing their excursion demands below the crossover frequency. The low pass filter is adjustable from 50 to 150 Hz for integration with a wide range of main speaker sizes and crossover preferences. Phase adjustment at 0 and 180 degrees addresses polarity alignment between the sub and main speakers. A slave RCA output allows a second Sub 3 to be connected and driven in sync, doubling bass output and improving low-frequency coverage in larger rooms or dedicated home cinema installations.

Key Features

• 23cm MSP Woofer: A new-design Dynaudio MSP cone driver purpose-built for the Sub 3, using Dynaudio's proprietary Magnesium Silicate Polymer diaphragm material for controlled stiffness and self-damping across the full bass operating range.
• 300W Amplifier: The same power class as the Sub 600 predecessor, providing dynamic headroom for demanding music and cinema listening levels in medium to large rooms.
• 37mm Double-Thickness Curved Front Baffle: A Contour series-derived double-thickness front panel that significantly increases cabinet rigidity and reduces driver-to-cabinet energy coupling compared to standard 18mm MDF construction.
• Sealed Enclosure Design: Closed-box architecture for tighter transient bass response, more controlled decay, and optimised performance for music and cinema use in the Sub 3's compact footprint.
• Adjustable Low Pass Filter (50-150 Hz): Continuously variable low pass crossover for integration with main speakers ranging from compact standmounts to full-size floorstanders.
• High Pass Filter (Flat / 60 Hz / 80 Hz): Three-position high pass filter for satellite speaker integration, reducing low-frequency excursion demands on main speakers and improving their midrange clarity.
• Stereo Pass-Through for Amplifier Integration: Dual RCA stereo inputs and satellite outputs allow in-line connection between source and amplifier in systems without a dedicated subwoofer output, enabling full bass extension in stereo setups.
• Slave Output for Dual Sub Configurations: An RCA slave output drives a second Sub 3 in synchronised operation for larger rooms or home cinema installations requiring additional low-frequency coverage.
• Compact Sub 250 Footprint: Identical external dimensions to the previous Sub 250, allowing direct upgrade placement without repositioning.

Technical Specifications

Connections at a Glance

• 1 x RCA LFE input (for AV processor subwoofer output)
• 2 x RCA stereo inputs (for in-line stereo amplifier integration)
• 2 x RCA satellite outputs (high pass filtered, to main amplifier)
• 1 x RCA slave output (to drive a second Sub 3)

Frequently Asked Questions

What is the Dynaudio Sub 3?

The Dynaudio Sub 3 is a 300W active sealed subwoofer built in Denmark, using a 23cm MSP driver in a compact cabinet with a 37mm double-thickness curved front baffle. Frequency response extends from 22 Hz to 175 Hz at +/-3 dB, with an adjustable low pass filter from 50 to 150 Hz, a three-position high pass filter at flat, 60 Hz, or 80 Hz, 0/180 degree phase adjustment, and signal pass-through connections for stereo system integration without a dedicated subwoofer output. It is sold as a single unit.

How does the Dynaudio Sub 3 compare to the Sub 6?

The Dynaudio Sub 6 is the flagship model, using two 24cm MSP+ Hybrid Drive woofers in a twin opposing sealed enclosure with 500W amplification, frequency response from 16 Hz to 230 Hz, dual balanced XLR and unbalanced RCA connections, three-band fully parametric EQ, automatic DSP time delay alignment, and built-in speaker preset performance maps for specific Dynaudio models. The Sub 3 uses a single 23cm MSP driver with 300W amplification, frequency response from 22 Hz to 175 Hz, RCA-only connections, and manual crossover controls without parametric EQ or speaker presets. The Sub 3 is the appropriate choice for small to medium rooms and systems up to Contour level, while the Sub 6's twin opposing driver design, deeper bass extension, balanced connections, parametric EQ, and Dynaudio speaker presets make it the preferred choice for Contour, Confidence, and Evidence systems in larger rooms.

Can the Dynaudio Sub 3 be used in a stereo system without a subwoofer output?

Yes, this is a key design priority of the Sub 3. Its dual RCA stereo inputs and satellite RCA outputs allow it to be inserted in-line between a source or preamplifier and a stereo power amplifier or integrated amplifier's power input. The sub takes a parallel feed from the stereo signal, and the high pass filtered satellite outputs pass the signal minus the low frequencies to the main speakers, reducing the excursion demands on them below the crossover point. An LFE RCA input is also provided for AV processor integration in multichannel systems.

What is the high pass filter on the Sub 3 and when should it be used?

The high pass filter on the Sub 3's satellite outputs applies a 60 Hz or 80 Hz cutoff to the signal sent to the main speakers, preventing them from receiving bass frequencies below the selected point. This reduces the excursion demands on the main speakers in the bass region, improving their midrange clarity and reducing distortion at higher listening levels. The flat setting bypasses the high pass filter and sends a full-range signal to the satellite outputs, appropriate for systems where the main speakers handle low frequencies independently. The 80 Hz setting is generally recommended for compact standmount speakers, while 60 Hz suits larger standmounts and floorstanders with usable bass below that frequency.

Can two Dynaudio Sub 3 units be run together?

Yes, the Sub 3's RCA slave output allows a second Sub 3 to be connected and driven in synchronised operation from the first unit. This doubles low-frequency output and improves bass coverage uniformity across the listening room by placing drivers at two positions, reducing the room mode standing wave concentration that a single subwoofer can create. Dual sub configurations are particularly effective in larger rooms or dedicated home cinema installations where even bass distribution across multiple seating positions is a priority.

Where can I buy the Dynaudio Sub 3 in Buffalo, NY or the USA?

The Dynaudio Sub 3 is available at Vinyl Sound in Buffalo, NY, USA. Vinyl Sound is an authorized Dynaudio dealer serving customers in Buffalo, Western New York, and across the United States. Contact Vinyl Sound Buffalo to discuss system integration options or to pair the Sub 3 with matching Dynaudio speakers.