Stereo Balanced Headphone Dual Amp
Twin channel Stereo balanced headphone amplification system.
Custom made for one of our clients, it features twin stereo units in a single 2-unit rackmount chassis, a stereo
input and a stereo 'feed-thru' output for future expansion.
Features
- Two identical stereo units for balanced headphones
- Extremely low noise and harmonic distortion
- Ultra-transparent sound and flat frequency response for reference listening sessions
- Real constant current source working mode for improved headphone driving
- Minimum signal path
- Two 4-deck 23-step balanced stereo attenuator with 1% precision SMD metal film resistors
- Optimal channel tracking (0.2 dB)
- Custom four dual-rail PSU (8 outputs) for minimum channel crosstalk
- Neutrik gold contact connectors for improved longevity of connection
- Minimum load impedance: 200 ohms or higher
- Recommended load impedance: 600 ohms
- High output impedance
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| 1-front |
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| 2-front |
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| 3-retro |
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| 4-main 4-ch amp board |
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| 5-Viewed from above |
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| 6 - The big regulated PSU section |
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| 7 - Amp board - note the big ground plane for screening purposes |
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| 8 - stepped attenuator close-up. Note the small SMD resistors soldered along the path |
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| 9 - A labour of love |
HPBA-2-S |
Stereo Balanced Compact custom unit
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| 1 - Front panel |
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| 2 - Rear panel |
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| 3 - Pure silver internal wiring |
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| 4 - Precision stepped stereo volume control |