HRK SM2558 - Mixer - Excellent

Why This One

• Excellent condition — light signs of use, no obvious issues
• Fully tested — all applicable functions verified working
• Discrete Class A, transformer-output British summing with NOS transistors and +18dBu headroom.
• A boutique UK-built 500-series summing module sold direct, keeping cost well below comparable alternatives.

Condition: Excellent

This HRK SM2558 is an excellent-condition mixer. It has passed our 8-point functional test, with 4 item(s) not applicable to this unit. Please review all photos carefully, as they provide an accurate representation of the cosmetic condition of the product.

What's Included

• HRK SM2558
• No additional accessories included

About This Model

The HRK SM2558 is a British-made, single 500-series module designed for analog summing outside the box. It accepts 10 inputs in total — 8 via a front-panel DB25 connector and 2 via front-panel TRS jacks — with all inputs electronically balanced at 20kΩ impedance. The output stage uses custom HRK audio transformers driven by discrete Class A circuitry built around NOS transistors, delivering a +18dBu headroom ceiling on the summed output via rear-panel XLR. A front-panel switch engages Vintage Console Mode, which introduces harmonic saturation through the output transformers, while a MON switch routes the main outputs to the TRS jacks for latency-free direct monitoring. The first 8 inputs can be routed to the left bus, right bus, or both via PCB jumpers, giving flexible stereo placement. Drawing less than 100mA, it runs comfortably in any standard 500-series rack.

A great opportunity to own a HRK SM2558 at this price point.