Overview
• The Niles SI-1260 is a 12-channel (6 stereo zones) high-fidelity power amplifier designed for custom audio installations.
• It can operate as 12 independent channels or be bridged into more powerful mono channels.
• Often used in multi-room setups, it provides flexibility, reliability, and clean power delivery.
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Key Specifications
Amplifier Type
• Class AB design
• Discrete output devices
• Fully stable into low-impedance loads
Power Output
• 12 x 60 watts RMS per channel into 8 ohms (20 Hz – 20 kHz, <0.09% THD, all channels driven)
• 12 x 80 watts RMS per channel into 4 ohms
• 6 x 160 watts RMS per channel bridged into 8 ohms
Frequency Response
• 5 Hz – 100 kHz (+0 / –3 dB)
Total Harmonic Distortion (THD)
• < 0.09% (20 Hz – 20 kHz at rated power, all channels driven)
Signal-to-Noise Ratio
• 112 dB A-weighted
Damping Factor
• Greater than 200 (20 Hz – 1 kHz at 8 ohms)
Input Sensitivity / Impedance
• Input sensitivity: 1.0 V for full output
• Input impedance: 22k ohms
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Connections and Controls
• Inputs:
• 6 stereo RCA inputs (one per zone)
• 1 global bus input (can feed all zones)
• Outputs:
• 12 sets of 5-way binding posts for speakers (accept banana plugs, spades, or bare wire)
• Loop outputs (RCA) for daisy-chaining sources
• Controls:
• Independent level trim control for each channel
• Mode switches per zone: Stereo, Bridged, or Bus
• Triggering / Power Options:
• 12V trigger input & output
• Audio signal sensing (auto-on)
• Always-on mode
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Protection Features
• Independent channel protection against short circuits, overheating, and DC offset
• Front panel LED indicators for power and protection status
• Internal cooling fan with quiet operation
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Physical
• Rack Mountable: Yes (3U high, rack ears included)
• Dimensions: 17.25” W x 5.25” H x 16.5” D (43.8 x 13.3 x 41.9 cm)
• Weight: ~42 lbs (19.1 kg)
• Finish: Black, with heavy-duty chassis
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Use Case
• Perfect for whole-house distributed audio (up to 6 zones stereo).
• Flexible bridging allows powering high-demand speakers or home theater zones.
• Integrates easily with multi-room controllers, speaker selectors, or automation systems.