SONODYNE SRP 400

Product overview

The SONODYNE SRP 400 is the most compact active reference monitor in the SRP line: a 4.5 inch CURV cone woofer and a 26 mm silk dome tweeter in a custom waveguide, housed in a pressure die-cast aluminium enclosure.

The SRP 400 is an excellent reference to understand how mixes translate to smaller speakers. A 25 W + 25 W bi-amplifier drives the transducers optimally, for a maximum SPL of 100 dB and a frequency response of 75 Hz - 22 kHz (±2 dB). Room compensation HF and LF tilts are available at the rear, the front level control ranges from mute to +6 dB with a centre detent at 0 dB, and the fully balanced XLR input comes with a linked TRS socket.

Key features

• Pressure die-cast aluminium enclosure, vented through a front-firing aerodynamic port
• 4.5 inch CURV cone woofer, magnetically shielded
• 26 mm silk dome tweeter, magnetically shielded, in a custom waveguide
• Bi-amplifier: LF 25 W, HF 25 W before clipping; THD below 0.1 % at rated power
• Room compensation: bass roll-off 100 Hz, bass tilt and treble tilt switches at the rear
• Front level control from mute to +6 dB with centre detent at 0 dB
• Fully balanced XLR input with linked TRS socket; tapped inserts at the rear and bottom for mounting

Rigid aluminium die-cast enclosure

The enclosure is pressure die-cast aluminium that maximises rigidity and lends it a unique form. SONODYNE explains that this is significantly more rigid than conventional MDF cabinets: it reduces cabinet resonance and colouration for tighter bass, greater clarity and improved overall accuracy, while the non-parallel edges minimise standing wave build-up.

CURV cone woofer and custom waveguide

The 4.5 inch CURV cone woofer produces impressive bass and transient response. The silk dome tweeter is nested in a custom waveguide to produce on and off axis linearity and a wide, detailed soundstage.

Bi-amplifier and room compensation

A 25 W + 25 W bi-amplifier drives the transducers optimally; each driver has its own dedicated amplifier. Two rear switches are labelled bass roll-off 100 Hz / bass tilt -2 dB and bass tilt -4 dB / treble tilt -2 dB; the front level control ranges from mute to +6 dB with a centre detent at 0 dB.

Connections and mounting

The SRP 400 accepts XLR and TRS balanced inputs; -2 dBu at the input gives 90 dB SPL at 1 m. Tapped inserts at the rear and bottom (2 x M6 on the rear, 4 x M6 on the base) and the SRP WB1 wall mount bracket allow for various mounting options.

In the box

• SRP 400 active reference monitor

SONODYNE SRP 400: frequently asked questions

Is the SRP 400 active or passive?

Active. All SRP monitors have built-in bi-amplification: the SRP 400 drives its woofer with 25 W and its tweeter with 25 W (before clipping).

What is the SRP 400 designed for?

SONODYNE describes it as an excellent reference to understand how mixes translate to smaller speakers.

Can I adjust the SRP 400 to my room?

Yes. Room compensation HF and LF tilts are available at the rear, together with a 100 Hz bass roll-off (6 dB/octave).

Do I need a separate amplifier?

No. Every SRP monitor has built-in amplification: connect your audio interface, mixer or monitor controller using balanced cables.

Who is the SRP 400 designed for?

SONODYNE designs the SRP range for music producers, recording and mastering engineers, broadcast professionals, content creators, home studios and audio training centres.

Where can I buy the SONODYNE SRP 400 in India?

The SONODYNE SRP 400 is available from Shivansh Electronics, Kolkata, West Bengal, India, with delivery across India.

Workflow 1: Mixing room near field monitoring

Engineers who mix on near field monitors.

Connections

Setup

1. Place a pair of SRP 400 monitors to form a triangle with the listening position.
2. Connect each monitor's input to a balanced monitor output.
3. Set the gain control on both monitors to the same position.
4. Use the rear tilt switches to suit the room.

Tip: Use the SRP 400 to check how a mix translates to smaller speakers.

Workflow 2: Music production studio

Music producers working on full mixes.

Connections

Setup

1. Connect the audio interface's balanced outputs to the monitors.
2. Set the gain controls.
3. Adjust the bass and treble tilts for the room and placement.

Tip: The 4.5 inch CURV cone woofer reaches 75 Hz (±2 dB).

Workflow 3: Home studio

Home studio enthusiasts and content creators.

Connections

Setup

1. Connect the monitors through an external USB audio interface or mixer.
2. Use balanced XLR or TRS cables.
3. Set the gain control and the tilt switches.

Tip: SONODYNE recommends an external interface or mixer for balanced outputs, better signal quality and lower noise.

Workflow 4: Broadcast and content production

Broadcast professionals and content creators.

Connections

Setup

1. Connect the balanced monitor output to the XLR inputs.
2. Set the level with the gain control.
3. Use the tilt switches where needed.

Tip: Fully balanced inputs with a CMRR above 65 dB.

Workflow 5: Wall-mounted monitoring

Rooms where the monitors are mounted on the wall or a bracket.

Connections

Setup

1. Fit the SRP WB1 wall mount bracket to the M6 inserts.
2. Position the monitor in the horizontal and vertical planes.
3. Route the cables through the recessed inlet.

Tip: Tapped inserts at the rear and bottom allow for various mounting options.

Workflow 6: Audio training centre

Educational institutions and audio training centres.

Connections

Setup

1. Connect the mixer or interface to the monitor inputs.
2. Set the gain controls.
3. Demonstrate the effect of the tilt switches on the room response.

Tip: Protection against over current, overheat, RFI and switch on/off transients.