CI-1255e Power Amplifier

  • Delivers 55 watts RMS per channel (100W peak) into 8 Ohms
  • Individual level controls for each of the 12 channels
  • Equipped with Faultsafe to protrect against compromised channels

The Hafler CI-1255e™ is an innovative 12 channel amplifier designed for multi-zone custom homes as well as numerous demanding commercial sound installations such as restaurants and social houses where high performance audio is required and reliability is of utmost concern.

The design begins with gold plated RCA inputs connectors for each channel. A stereo bus input may be used to feed any or all channels simultaneously from a single source. This is paralleled on the front panel via a convenient 3.5mm input for an iPhone®, tablet, or Bluetooth® interface. Speaker outputs also employ detachable Euroblock (Phoenix style) connectors for easy termination.

As with all Hafler amplifiers, sound quality and reliability are paramount. Unlike other multichannel amplifiers that use sonically compromising class-D or H switch-mode designs, the Hafler CI-1255e employs true class AB architecture to deliver 55 watts RMS per channel (100W peak) of pure power at 8 ohms and 70 watts RMS (140W peak) at 4 ohms on each channel. Channels 11 and 12 may be configured in bridged mono mode to deliver 180 watts RMS to power a subwoofer. Individual gain controls on each channel allow for precise adjustments for each of the 12 zones. Front and rear panel signal presence LEDs provide further aid during setup by allowing for visual monitoring of signal flow. Should a fault be encountered, the CI-1255e will automatically shut down the compromised channel and self-reset when the fault is removed. This is augmented with peak LEDs on the front panel to monitor signal levels for each zone.

Housed in a compact 17" x 3.5" x 11.5" (432 x 89 x 292mm) solid steel enclosure, the CI-1255e may be rack-mounted in a standard 19” 2 RU rack using optional rack ears. An ultra-quiet side-mounted HushTone™ fan generates a mere 22dB as it circulates air to cool the unit.

The Hafler CI-1255e delivers legendary reliability and unparalleled sound quality for the most demanding multi-zone installations.


Home Audio Distribution

Easily feed a single source to multiple sets of speakers using the Global Bus inputs, while also using channels 9-12 to power a home theatre system and subwoofer.


Individual channel inputs allow you to send different program material to separate rooms within a venue, feeding classical music to the dining room of a restaurant and rock music to the bar/lounge area.

Dolby Atmos®

The CI-1255e is ideal for home theatres using the Dolby Atmos standard in 5.1 and 7.1 surround sound systems.


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    Individual LEDs on each channel to monitor signal presence and clip for each connected zone.

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    Bus Input

    Conveniently located to connect a cell phone, tablet, or Bluetooth® interface to the CI-1255e.

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    High tensile power switch is rated at over 10,000 actuations for extra durability.

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    Compact 17" x 3.5" x 11.5" (432 x 89 x 292mm) solid steel enclosure.

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    Rack Ears

    Optional rack mounting brackets to fit the amp into a standard 19” 2RU rack enclosure.

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    RCA Inputs

    Used to connect unbalanced source audio signal to the CI-1255e input channels.

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    Bus Inputs

    Input used when you want to feed multiple channels from the same source.

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    Bus Select

    Routes input of each channel to the stereo input Bus.

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    Individual level control for each channel, set using a small screwdriver.

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    Detects signal presence – rear mounted to simplify setup when configuring and testing system.

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    Euroblock (Phoenix® style) detachable screw-down connectors for quick, easy and reliable connectivity to the loudspeaker wires. Handles 18 to 10-gauge wire.

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    Safety Certified

    Safety certified for use in the USA, Canada and Europe.

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    Standard IEC 3-pole connector allows various cables to be used for international markets.

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    Bridge Mode

    Available on channels 11 and 12 for a 120 Watt mono output to feed a subwoofer. Push in to activate.

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    High Current

    Twelve-channel amplifier rated at 55 watts RMS per channel – 100 Watt peak.

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    Side-mounted fan delivers quiet cooling without the need for a dust filter.

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    Toroidal Transformer

    Low noise toroidal transformer with dual taps for 115 and 230-volt operation.

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    Heat Sink

    Internally mounted and mated directly with the output transistors for optimal heat transfer.

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    Automatic individual channel protection against low impedance, overheating, overloading, over-voltage, under-voltage and short circuits.



# of Channels



Gold RCA jacks with adjustable gain,
3.5mm global bus input

Optional Analog Inputs

Euroblock (Phoenix® style) connectors


Euroblock (Phoenix® style) connectors

Input Impedance

22k ohms

Output Power

55 watts RMS per channel (8 ohms)

Peak Output Power

100 watts per channel (8 ohms)

Bridged Output Power

120 watts per channel (8 ohms only)

Ideal Impedance

6 - 8 ohms

Frequency Response

+/-0.5dB from 15Hz - 50kHz

S/N Ratio

> 102dB (A weighted)

THD Distortion

< 0.1% 20Hz to 20kHz

IMD Distortion

< 0.01%@ 60Hz

Common Mode Rejection

-70dB direct coupled
-90dB with Jensen transformer option

HushTone™ Fan Noise

22dB maximum

Power (Maximum)

750 watts at 117VAC or 230VAC

Gain control

-40dB to +20dB for each channel

Voltage Requirements

115V 60 Hz, 230V 50Hz

Damping Factor


Maximum wire gauge

10-gauge (2.59mm)


17" x 12.25" x 3.45" (4.06" with feet) (432 x 311mm x 292mm)

Shipping Dimensions

23.5" x 16" x 7.5" (597 x 406 x 191mm)


27lbs (12.2kg)

Shipping Weight

28lbs (12.7kg)

Storage Temperature

-40° to +120° C

Working Temperature

-5° to +40° C

Block Diagram


Optional Rack Ears

Optional Cable Strain Relief



Can the CI-1255e be used in countries that operate at 240 volts?

Yes. The CI-1255e is designed with sufficient headroom to handle 240 volts.

Can I bridge other channels mono like channels 11 and 12?

No, only the last two channels can be bridged.

What happens if I use a loudspeaker with a lower impedance than rated?

Do not do so. The Hafler CI-1255e is designed to work within certain limits and applying the proper load is critical to long term reliability.

What happens if I use a loudspeaker that is rated higher than the recommended impedance?

The efficiency of the system will be reduced and the system will not play as loud.

Can I stack more than one amplifier on top of each other?

Yes, but this must be done in such a way to ensure proper ventilation. If stacked on a shelf, ensure the large feet are employed and that the sides and back are free from obstructions. If you are rack mounting the CI-1255e using the optional 19” rack ears, leave a rack space in between each amp to ensure air flow is not restricted.

Will that the fan will be noisy?

The CI-1255e employs a very special ultra-quiet HushTone™ fan that produces less than 22dB of sound. This is quieter than most household appliances.

What happens if I notice a dead short - like a nail or screw through a speaker cable?

Switch off the amp power switch immediately and remove the nail or screw. Using an ohm meter check to see if the wires are still not short circuited and they are working properly. Replace the wire if there are any problems.

Do all channels need to be connected for safe use?

No. You can use as many or as little channels as you like. Simply leave the amp channels that are not in use unterminated and make sure the bus switch is in the out position.