Heritage Audio O.H.M. Headphone Matching Amplifier.

The Heritage Audio O.H.M. Amp is a premium headphone amplifier designed to deliver unmatched performance and versatility. With three independently selectable input sources — balanced input, gold-plated RCA input, and a pro-quality Bluetooth receiver with Burr Brown DAC — the O.H.M. Amp brings your headphones to life. Whether you’re using low-impedance earbuds or high-end audiophile headphones, its impedance matching selector ensures optimal signal performance tailored to your headphones’ specific impedance.

Forget noisy adapters! The O.H.M. Amp includes both 6.35 mm and 3.5 mm headphone jacks on the front panel, so you can connect your headphones directly with no hassle. Its discrete diamond buffers, borrowed from Heritage Audio’s acclaimed R.A.M System 2000 and 5000 models, combined with Burr Brown op-amps, deliver extreme fidelity and ultra-low noise, ensuring audiophile-grade sound quality across the board.

Take full control of your audio with the Alps “Blue Velvet” output level potentiometer and enjoy the flexibility of chaining multiple units together via the built-in pass-through outputs. The external 30V high-voltage, low-noise power supply guarantees exceptional power delivery, an expansive dynamic range, and ultra-low harmonic distortion.

Designed for versatility, the O.H.M. Amp can be used as an elegant tabletop device or mounted on a microphone stand using its 5/8″ mounting hole. Whether in the studio, at home, or on the go, the O.H.M. Amp is the ultimate tool for headphone enthusiasts.

---

Specifications

• Inputs: Balanced (TRS/XLR Combo), Gold-Plated RCA, Bluetooth Receiver with Burr Brown DAC (APTX, APTX LL, AAC, APTX HD, SBC)
• Outputs: Independent 6.35 mm and 3.5 mm headphone jacks, Thru output for chaining units or Bluetooth receiver functionality
• Amplifier Design: Discrete diamond buffers, Burr Brown op-amps
• Output Control: Alps “Blue Velvet” potentiometer for audiophile-grade output level adjustment
• Power Supply: External low-noise, high-voltage 30V power supply
• Chassis: Desktop with rubber feet; 5/8” drilled hole for microphone stand mounting

---

Features

• Impedance-matching selector for optimal headphone performance
• Full connectivity: balanced, gold-plated unbalanced, and Bluetooth inputs
• Audiophile-grade Alps “Blue Velvet” output level potentiometer
• Burr Brown Op-Amps for ultra-low noise and high-fidelity response
• Dual headphone jacks (6.35 mm and 3.5 mm) for convenience
• High-quality Bluetooth receiver with advanced codec support
• Chain multiple units or use as a premium Bluetooth receiver with the Thru output
• External 30V power supply for exceptional power delivery, dynamic range, and low distortion
• Compact desktop chassis with versatile mounting options