Furman HA-6A Owner's Manual

MODEL HA-6A

Owner’s Manual

Important Note: To obtain best results from this Furman Sound electronic
product, please be sure to read this manual carefully before, using, it,
Also, to be sure of obtaining full protection under the terms of the Limited
Warranty in case your ownership documents are lost, please fill out and
return the Warranty Registration Card immediately'. Please verify that the
serial number shown on the Warranty Card matches the serial number
on your unit.

I

HA -6A SPECIFICATIONS

OUTPUTS: Power:
Connectors:
INPUTS: Input Impedance: Sensitivity: Connectors:
GENERAL: Distortion:
Signal to Noise: Frequency Response Dynamic Headroom:
Power Requirement:
Mechanical:
20 watts per channel, stereo, into either 4 ohms or 8 ohms, 20 Hz to 20 KHz. Speak-s A: 5-way binding posts (accommodates

dual banana plug,,, spade lijgs, bare wires, etc.) Speakers B-Satellite/Remote: XLR.

20K ohms. -4 dBV (635 mv) required for full output. HA-6A, 1/4* stereo phone, balanced or unbalanced; HA-6AB, both stereo
phone (balanced or unbalanced) and XLR (balanced).

. 01 % THD at full rated power at 1 KHz;
.05% THD 20Hz to 20 KHz.
Greater than 99 dB below full rated output.
+0, -1 dB from 20 Hz to 20 KHz, 1 watt output.
2 dB, stereo, measured with 10 ms toneburst at I KHz,
1 % duty cycle.
HA-6A, HA-6AB: 120 VAC, 60 Hz, 70 wafts
HA-6AE, HA-6ABE: 230 VAC, 50/60 Hz, 70 watts
Dimensions: 1.75" H x 19" W x 7.25" D. Wt: 7.5 lbs (3.4 kg)

..........

Introduction

Congratulations on your purchase of a Furman Sound HA-6A. You have chosen the most versatile headphone amplifier
available. The HA-6A is a unique combination of a headphone amp and a conventional power amp, which can save the expense
of an extra power amp in many situations. Its high power capacity allows it to provide adequate headphone listening levels
without distortion in any environment. Additionally, the HA-6A's new toroidal transformer assures noise-free performance. It
eliminates electrical hum and mechanical noise from the unit itself, as well as leakage into other sensitive equipment, such as
mic preamps, video monitors, etc.

The HA-6A is designed for recording studios, rehearsal studios, language labs, and for use in demonstrations of audio tracks
or audio equipment.

Features

• Powers headphones AND speakers

• 20 watts per channel, stereo

• Toroidal power transformer for ultra-quiet performance

• 6 headphone outs, each with its own volume control

• Switches for two sets of speakers

• Automatically switches to mono mode when right channel is not used

• Overload and signal-present LED's for each channel

• Ground lift, on-off switches

• Power-on indicator

• Provision for remotely located volume controls

Description

The HA-6A is basically a 20 watt per channel stereo amplifier. Unlike a conventional power amp, however, it has six 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 hi 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 two sets of studio monitor speakers, selected by
pressing front panel pushbuttons. Without the HA-6A, a separate amp would be needed for the studio speakers.

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

The Furman HA-6A'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-6A'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-6A 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. With the HA-6A, both headphones and monitor
speakers are free of the hum that can occur when using an amplifier not equipped with a toroidal transformer.

The HA-6A is fully protected against thermal overload, and it can withstand a short circuit on any or all outputs for an
indefinite time without damage.

Options and Accessories

Option: Model HA-6AB: Provides XLR connectors for balanced inputs, and also standard 1/4" phone jacks, which can be
either balanced or unbalanced, depending on whether a stereo or mono phone plug, respectively, is used.
Accessory: Model HR-2 Headphone Remote Station: A compact, unobtrusive box that clamps to any mike stand, providing
two headphone jacks, each with its own volume control. Twelve or more HR-2 boxes may be connected to a HA-6A using
standard microphone cables, depending on the impedance of the headphones used.