SONODYNE SLF 312

Product overview

The SONODYNE SLF 312 is a 12 inch powered subwoofer of the SLF Series: a front firing, vented subwoofer with a 12 inch high-excursion transducer, a class D amplifier and 2.1 channel bass management.

The SLF 312 is a no nonsense 12 inch powered subwoofer that can be used singly or in sets for large multichannel systems. It reaches a maximum SPL of 116 dB, with a frequency response from 30 Hz to the crossover frequency (-6 dB) and a usable response down to 25 Hz (-10 dB). Left, right and LFE signals enter through fully balanced XLR sockets; the left and right outputs feed the main monitors through a fixed 80 Hz high-pass, while the crossover (LPF) is adjustable from 50 Hz to 150 Hz.

Key features

• 12 inch high-excursion transducer powered by a class D amplifier
• 2.1 channel bass management: left, right and LFE inputs; left and right outputs high-passed at 80 Hz
• Discrete phase control from 0° to 180°
• Polarity switch and ground lift switch
• External (foot switch controlled) bass management
• Front firing, vented 18 mm MDF enclosure, black painted

12 inch transducer and class D amplifier

A single 12 inch high-excursion subwoofer transducer is driven by a class D amplifier (300 w amplifier power, 0.1 % THD at rated power), with a signal to noise ratio of 98 dB (A-weighted) and thermal, overload, short-circuit and DC-at-output protection. SONODYNE powered subwoofers are designed to deliver for monitoring needs, with high quality transducers and power amplifiers with adequate headroom to handle dynamics.

2.1 channel bass management

The SLF 312 sits between the source and the main monitors. It takes the left, right and LFE signals, reproduces the low frequencies below its crossover (50 Hz - 150 Hz) and passes the left and right signals on to the monitors through a fixed 80 Hz high-pass. Bass management can also be controlled externally with a foot switch.

Controls for the room

Gain (-60 dB to +6 dB), discrete phase control from 0° to 180° and a polarity switch help the SLF 312 blend with the main monitors at the listening position; a ground lift switch helps where a ground loop causes hum; a limiter can be switched on or off.

Front firing, vented enclosure

The vented enclosure is made of 18 mm MDF, finished in black paint, with black grill cloth stretched over a wooden frame. It measures 398 x 402 x 555 mm (W x H x D) and weighs 29 kg.

In the box

• SLF 312 powered subwoofer

SONODYNE SLF 312: frequently asked questions

Is the SLF 312 active or passive?

Active: the SLF 312 is a powered subwoofer with a built-in class D amplifier.

How does the SLF 312 connect to my monitors?

Connect the source to the left and right (and LFE) XLR inputs, then connect the left and right XLR outputs to the main monitors: they receive the signal high-passed at a fixed 80 Hz.

What crossover range does it offer?

The crossover frequency is adjustable from 50 Hz to 150 Hz; phase is adjustable from 0° to 180°.

What are its size and weight?

398 x 402 x 555 mm (W x H x D) and 29 kg net.

Where can I buy the SONODYNE SLF 312 in India?

The SONODYNE SLF 312 is available from Shivansh Electronics, Kolkata, West Bengal, India, with delivery across India.

Workflow 1: Stereo 2.1 studio monitoring

Producers adding low end to a pair of studio monitors.

Connections

Setup

1. Place the subwoofer near the front of the room.
2. Connect the source to the left and right inputs.
3. Connect the outputs to the monitors.
4. Set the crossover, then the gain, by ear at the listening position.

Tip: The monitors receive the signal high-passed at a fixed 80 Hz.

Workflow 2: Multichannel monitoring with LFE

Engineers working on multichannel mixes.

Connections

Setup

1. Connect the LFE feed to the LFE input.
2. Set the gain to match the main monitors.
3. Check the phase setting at the listening position.

Tip: 2.1 channel bass management with left, right and LFE inputs.

Workflow 3: Phase alignment at the listening position

Anyone setting up a subwoofer with monitors.

Connections

Setup

1. Play a low frequency signal near the crossover.
2. Sweep the phase control from 0° to 180°.
3. Leave it where the bass sounds fullest; try the polarity switch too.

Tip: Discrete phase control from 0° to 180°.

Workflow 4: Checking mixes with and without the subwoofer

Mix engineers checking the low end of a mix.

Connections

Setup

1. Connect a foot switch to the rear jack.
2. Play the mix.
3. Use the foot switch to control the bass management while listening.

Tip: External (foot switch controlled) bass management.

Workflow 5: Quiet, hum-free installation

Studios with mixed equipment and long cable runs.

Connections

Setup

1. Use balanced XLR cables throughout.
2. If hum appears, use the ground lift switch.
3. Keep the mains and signal cables apart.

Tip: Fully balanced XLR inputs and outputs.

Workflow 6: Larger systems

Large multichannel rooms needing more low-frequency output.

Connections

Setup

1. Plan the subwoofer positions in the room.
2. Feed each subwoofer from the controller.
3. Level-match the subwoofers and set the phase of each.

Tip: The SLF 312 can be used singly or in sets for large multichannel systems.