ACTIVE SUBWOOFER

PSI Audio Sub A125-M

Name: PSI Audio Sub A125-M
Brand: PSI Audio

Sub A125-M in Studio Red. Official PSI Audio photograph.

A compact active subwoofer for adding deeper bass to a music system. It takes up less room than Sub A225-M and pairs naturally in size with PSI’s smaller speakers.

FromA$5,699 each

Studio Red. Including GST.View black and white pricing

Enquire about this model

IS IT RIGHT FOR YOUR SYSTEM?

Why consider Sub A125-M?

A125-M is the smaller option for adding low bass to a two-channel system. It is worth comparing with A225-M when you want more extension but have limited room beside the main speakers.

Amplification matched to the drivers

The crossover and amplifiers are designed for the drivers in each cabinet. The signal path is analogue, without DSP, and the built-in amplification removes the need for a separate power amplifier.

Measured individually in Switzerland

PSI Audio builds, measures and calibrates each speaker in Switzerland against its reference response. This sets up the speaker before it leaves the factory; placement and the room shape what you hear at home.

How does it compare?

Sub A125-M has one bass driver and a smaller cabinet than the dual-driver A225-M. Its −6 dB bass limit is 28 Hz; A225-M reaches 24 Hz and offers more output capacity.

Prices shown are for Studio Red and include GST.
Compare	Sub A125-M	Sub A225-M
Studio Red price	A$5,699 each	A$8,399 each
Design	Active subwoofer; single driver	Active subwoofer; dual drivers
Bandwidth at −6 dB	28 to 90 Hz	24 to 100 Hz
Each cabinet: W × H × D	320 × 480 × 385 mm	320 × 700 × 500 mm
Weight per cabinet	20.5 kg	35.6 kg
Manufacturer distance guide	From 1 m	From 1.5 m

Allow extra space for cables, ventilation and stands. Listening distances are PSI’s setup guide.

Connections and placement

Preamplifier / bass processorAnalogue output · volume controlled

Line output → XLR inputsPSI subwooferMains power to each cabinet

XLR Link → main speakersSignal pass-through, no high-passMains power to each cabinet

Basic signal path. Volume is controlled before the signal reaches the speakers.

Connect a volume-controlled line output to the balanced XLR inputs. In a stereo system, use the left and right inputs and Link outputs; in a cinema system, use the processor’s subwoofer output and bass-management settings.
The XLR input takes a line-level signal. Never connect a power amplifier’s speaker output to it. Start playback at low volume after connecting the system.
The two XLR Link outputs pass the signal to the main speakers without a high-pass filter. Use the PSI manual to set the main speakers’ Roll-Off and subwoofer controls together, or manage the crossover in an external processor.

Where to place it

Leave space for the rear connections and ventilation. Try the subwoofer in a few positions, listening for an even transition from the main speakers, then refine its level and crossover settings.

Each cabinet needs mains power and ventilation around its amplifier panel. The manual covers voltage selection and installation clearances. Use the distance guide above as a starting point for your listening setup.

Sub A125-M: front and rear, showing the signal connections and mains inlet.

See the three common home-system connections →

COLOURS & PRICES

Choose your finish.

The starting price is for Studio Red. Compare all three finishes below.

Australian retail prices. GST Included.
Finish	Each
Studio Red Product code A125MSUBR	A$5,699
Metal Black Product code A125MSUBB	A$5,999
Pure White Product code A125MSUBW	A$5,999

Prices are per unit.

Enquire about this model

Sub A125-M in Metal Black. Official PSI Audio photograph.

Sub A125-M in Pure White. Official PSI Audio photograph.

Specifications

System: Active subwoofer; single driver
Bandwidth at −6 dB: 28 to 90 Hz
Typical listening distance: From 1 m
Peak maximum SPL at 1 m: 111 dB, manufacturer product page
Amplifier peak power (manufacturer): 340 W
Dimensions (W × H × D): 320 × 480 × 385 mm
Net weight: 20.5 kg
Inputs: 2 × balanced XLR; 2 × XLR link outputs

SPL is the manufacturer’s peak figure at 1 m. Amplifier power is also a peak rating; neither figure describes continuous output.

Technical documents

Common questions

Can I keep my current amplifier or source?

Yes, if it provides an analogue output with volume control. A DAC with variable XLR outputs can connect directly; a fixed-output DAC needs a preamplifier. An integrated amplifier with a variable pre-out can also serve as the front end. For RCA outputs, use a cable wired for the PSI input.

Will adding a subwoofer remove boomy bass?

A subwoofer adds bass extension and output; it is not a treatment for room resonance. If particular notes boom or linger, start with placement and level. Measurements can show whether the next step is integration, EQ or room absorption.

What warranty does PSI Audio provide?

PSI Audio provides a five-year warranty, with an extra year when you register your product.

Compare similar models

Sub A225-M →
Choose the larger A225-M when bass extension and output take priority over a compact cabinet. At 700 mm high and 35.6 kg, it needs a more substantial position than A125-M.

Explore system expansion

A215-M →
Find active speakers to use with your subwoofer.
A17-M →
Find active speakers to use with your subwoofer.

AUSTRALIAN ENQUIRY & SUPPORT

Enquire about Sub A125-M

Tell us about your source, listening distance and the model you are considering. We can help you work out how it would fit your system. You can also ask about ordering, lead times and audition options.

PSI AudioSub A125-M

Prefer to text us?Text MSN Audio

How to connect active speakers at home Speakers, subwoofers and AVAA explained