BRICASTI DESIGN M25 Pro

Product overview

The BRICASTI DESIGN M25 Pro is the Model 25 Professional Series stereo power amplifier: a dual mono transformer design rated at 150 W into 8 Ω, 300 W into 4 Ω and 600 W into 2 Ω per channel, with a fully differential balanced design.

The M25 Pro finds a special place in the BRICASTI DESIGN family of amplifiers through its dual mono transformer design, essentially a hybrid of the single-transformer M15 stereo amplifier and the larger M28 mono blocks. It delivers superb current in a smaller footprint for those who want additional power but lack the space for amplifier pairs, and its dual transformers render a beautiful sense of depth and dimension. Like every BRICASTI DESIGN amplifier, its fully differential balanced design gives a fast, low distortion, open and harmonically accurate musical presentation.

Key features

• 150 W / 300 W / 600 W per channel into 8, 4 and 2 Ω
• Dual mono transformer design: a hybrid of the M15 stereo amplifier and the M28 mono blocks
• Fully differential balanced design
• THD below 0.005 %, 20 Hz - 20 kHz at full rated power
• Frequency response 10 Hz - 150 kHz within 0.5 dB; gain 27 dB
• Input trim control in 6 dB steps, up to 18 dB, for gain staging with digital sources
• Balanced XLR and unbalanced RCA inputs
• All-aluminium chassis engineered to maintain thermal stability under challenging conditions
• Idle, standby and on modes; 5 or 12 V DC trigger in and out
• Handcrafted in the USA

Dual mono power in a smaller footprint

Two transformers, one per channel, give the M25 Pro its depth and dimension and superb current delivery, in one chassis instead of a pair of mono blocks.

A truly balanced system

The fully differential balanced design delivers a fast, low distortion, open and harmonically accurate presentation. Paired with any BRICASTI DESIGN fully differential D/A converter, a truly balanced system from converter to loudspeaker is achieved.

The perfect match

Trim control allows effective gain staging, which is critical when today's digital sources drive amplifiers directly, and the all-aluminium chassis is carefully engineered to maintain thermal stability under challenging conditions.

Ship kit and speaker cables

Every amplifier is supplied with a pair of 1 MHz HF filters for speaker cable capacitance compensation, fitted across the speaker terminals if a cable's capacitive load makes the amplifier fault at higher levels, and an XLR shorting plug to terminate the balanced input when the RCA inputs are used.

In the box

• M25 Pro dual mono power amplifier
• AC power cord with 15 A IEC connector
• Pair of 1 MHz HF filters for speaker cable capacitance compensation
• XLR shorting plug

BRICASTI DESIGN M25 Pro: frequently asked questions

How powerful is the M25 Pro?

150 W per channel into 8 Ω, 300 W into 4 Ω and 600 W into 2 Ω.

Can it be driven directly from a D/A converter?

Yes. The rear-panel input trim lowers the input sensitivity in four 6 dB steps, up to 18 dB, so a D/A converter with a digital level control can drive it directly.

Does it have balanced and unbalanced inputs?

Yes: balanced XLR inputs (200 kΩ) and unbalanced RCA inputs (100 kΩ). When the RCA inputs are used, an XLR shorting plug terminates the balanced input.

Can it be switched on remotely?

Yes: a 5 or 12 V DC trigger on the rear TRS jack switches it in and out of standby.

Where can I buy the BRICASTI DESIGN M25 Pro in India?

The BRICASTI DESIGN M25 Pro is available from Shivansh Electronics, Kolkata, West Bengal, India, with delivery across India.

Workflow 1: Studio monitoring from a fully differential D/A

Studios driving passive monitors from a BRICASTI DESIGN converter.

Connections

Setup

1. Connect the speaker cables first, with spade, ring or banana connectors.
2. Connect balanced XLR interconnects.
3. Press Power (idle), then Standby twice to reach On.
4. Set the rear trim so the source attenuates only a few dB digitally.

Tip: The trim gives 4 steps of 6 dB, up to 18 dB of attenuation.

Workflow 2: Direct drive from a source with digital volume control

Systems with no preamplifier.

Connections

Setup

1. Leave the trim at no attenuation to start.
2. Play the most dynamic material at the loudest listening level.
3. Turn the trim counter-clockwise in 6 dB steps until the source uses only a few dB of digital attenuation.
4. Keep large attenuation in the analog domain.

Tip: This keeps low-level resolution in the digital attenuator.

Workflow 3: Trigger-controlled system

Installations where a controller or preamplifier switches the amplifier.

Connections

Setup

1. Wire tip and ring as the trigger input; sleeve is chassis ground.
2. Apply 5 or 12 V DC to switch standby.
3. Leave the front Power switch on (idle draws about 2 W).
4. Use standby to pre-heat before a session.

Tip: In standby the amplifier is fully powered with muted inputs, about 60 W.

Workflow 4: Unbalanced source

Sources with RCA outputs only.

Connections

Setup

1. Connect the RCA cables.
2. Fit shorting plugs on the unused XLR inputs.
3. Power up through idle, standby and on.
4. Set the trim as needed.

Tip: The shorting plug terminates the balanced input correctly for best performance.

Workflow 5: Surround or multi-room listening rooms

Studios equipping listening rooms with several amplifiers.

Connections

Setup

1. Set each amplifier's trim to match.
2. Link trigger out to trigger in to switch them together.
3. Bring the system to standby before use.
4. Put each amplifier back to standby before switching off.

Tip: Standby first, then power off, for a clean, safe shutdown.

Workflow 6: Safe power-up and power-down

Every user, every day.

Connections

Setup

1. Press Power: the LED flashes about once a second (idle).
2. Press Standby: the LED blinks faster (standby, muted).
3. Press Standby again: the LED is solid and audio passes.
4. Hold Standby for about 2 s to return to idle.

Tip: The supply checks the mains voltage before allowing power up.