Furman HA6AB Headphone/Monitor Amplifier (Balanced)

The HA-6AB Headphone/Monitor Amplifier is a unique combination of a headphone amp and a conventional power amp. This combination of functions can save the expense of an extra power amp in many recording studios.

The HA-6AB is basically an economical 20-watt per channel stereo amplifier. Unlike a conventional power amp, however, it has 6 headphone outputs (stereo phone jacks) on the front panel, each with an associated volume control. When used for overdubbing or rehearsal, this provides more than adequate loudness in all headphones (even older low-impedance models), and allows each musician to set his or her own comfortable volume level. When the overdubbing is complete and the musicians remove their headphones, the HA-6A can power the tape playback through either (or both) of 2 sets of studio monitor speakers, selected by pressing front panel pushbuttons. Without the HA-6AB, a separate amp would be needed for the studio speakers.

Features
Powers headphones AND speakers

New! toroidal transformer for studio-quiet operation and low magnetic leakage

20 watts per channel, stereo

6 headphone outs, each with volume control

Switches for 2 sets of speakers

Automatically switches to mono mode when right channel is not used

Overload and signal-present LEDs for each channel

Ground lift, on-off switches; power-on indicator

Provision for remotely located volume controls

Provides balanced inputs with XLR connectors in addition to standard 1/4 in. phone inputs.

The HA-6AB also features a convenient input level control on the left side of the front panel. A pair of yellow LEDs-one for each channel-light up whenever signal is present (threshold -28 dBu). Another pair of red LEDs show an overload condition in either channel.

The Furman HA-6AB's 20 watts-per-channel make it ideal as a low distortion headphone driver for the most critical listening situations. While most headphone amps provide half a watt or less per headphone channel, the HA-6AB's higher power can drive headphones of any impedance to their full rated listening level, and do so with minimal noise and distortion. Its power capacity is also just right for the small "cube" reference speakers used in most recording studios as a comparison with the main control room monitors-it can power them without overpowering them. On the studio floor, a set of small monitor speakers driven by the HA-6AB can make a session progress more efficiently by giving the musicians a chance to hear a playback without needing to disconnect themselves from their equipment and walk into the control room.

The HA-6AB utilizes an efficient toroidal power transformer for silent operation and low magnetic leakage, as required in a studio environment. It is fully protected against thermal overload, and it can withstand a short circuit on any or all outputs for an indefinite time without damage.

Technical Info

Outputs
Power: 20 watts per channel, stereo, into either 4 ohms or 8 ohms, 20 Hz to 20 KHz
Connectors: Speakers A: 5-way binding posts (accommodates dual banana plugs, spade lugs, bare wires, etc.) Speakers B/Remote Headphone: XLR

Inputs
Input Impedance: 20K ohms
Sensitivity: -1.9 dBu (625 mV) required for full output into 8 ohms
Connectors: HA-6A, 1/4 in. phone, unbalanced; HA-6AB, both phone (unbalanced) and XLR (balanced)

Distortion: .01% THD at full rated power at 1 KHz; .05% THD 20Hz to 20 KHz

Dynamic Range: Greater than 99 dB

Frequency Response: +0, -1 dB from 20 Hz to 20 KHz, 1-watt output

Dynamic Headroom: 2 dB, stereo, measured with 10 ms tone burst at 1 KHz, 1% duty cycle

Power Requirement: 120 VAC, 60 Hz, 130 watts, and 230 VAC, 50/60 Hz versions available

Mechanical
Dimensions (H x W x D): 1.75 x 19 x 7.25 in.

Weight: 9 lbs. (4.2 kg)

Agency Approvals: UL listed; CUL listed; CE listed

Note: 0 dBu equals .775 Vrms