Furman Sound Stereo Amplifier HA 6AB User Manual

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H A - 6 A B / H A - 6 A B E M a n u a l  
ers, selected by pressing front panel pushbuttons. mic stand, providing two headphone jacks, each  
Without the HA-6AB, a separate amplifier would with its own volume control. Up to twelve HR-2  
be needed for the studio speakers. The HA-6AB boxes may be connected to a HA-6AB, employing  
also features a convenient input level control on standard microphone cables (depending on the  
the left side of the front panel. A pair of yellow impedance of the headphones used).  
LED’s (one for each channel) light up whenever a  
signal is present.Another pair of red LED’s shows  
USES OF HA-6AB  
an overload condition in either channel.  
The HA-6AB may be used as a power ampli-  
The Furman HA-6AB’s 20 watts-per-channel  
fier to drive up to two pairs of speakers, or as a  
make it ideal as a low distortion headphone driver  
headphone amplifier for one to six pairs of head-  
for the most critical listening situations. While  
phones, or both. Additional headphones may be  
most headphone amplifiers provide half a watt or  
connected through use of HR-2 Remote Boxes.  
less per headphone channel, the HA-6AB’s higher  
power can drive headphones of any impedance RECORDING  
to their full rated listening level, and do so with  
In the recording studio, headphones are most  
minimal noise and distortion. Its power capacity  
often used in the overdubbing process, whereby  
is also just right for the small near field monitors  
new musical tracks are recorded in synchro-  
used in most recording studios; as a comparison  
nization with previously recorded tracks. The  
with the main control room monitors, it can power  
musicians doing the overdub hear the previously  
them without overpowering them. On the studio  
recorded tracks in their headphones, and play  
floor, a set of small monitor speakers driven by  
along with them. Synchronization is maintained  
the HA-6AB can make a session progress more  
because almost all multitrack recorders have the  
efficiently by giving the musicians a chance to  
capability of playing back through certain chan-  
hear a playback without needing to disconnect  
nels of the record head while recording through  
themselves from their equipment and walk into  
others. In this way, it is possible to build up a  
the control room.Additionally, the HA-6AB is fully  
complete recording of many tracks, adding one  
protected against thermal overload, and it can  
or more new tracks with each overdub.  
withstand a short circuit on any or all outputs for  
Headphones are much preferred to speakers for  
an indefinite time without damage.  
cueing the overdub, because of the presence of  
open microphones which would pick up the cue  
ACCESSORIES  
tracks as well as the overdub.Any trace of the cue  
tracks in the overdub tracks would degrade the  
Model HR-2 Headphone Remote Station: A  
tracks’ separation and make it difficult to achieve  
compact, unobtrusive box that clamps to any  
a good mix later on. In fact, even if headphones  
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H A - 6 A B / H A - 6 A B E M a n u a l  
are used, it is important that they clamp tightly to HA-6AB itself is installed in the control room. In  
the musicians’ heads so that a minimal amount this arrangement, the Speaker buttons will be  
of sound leaks out.  
more easily accessible to the engineer, and each  
musician’s volume control will be right on the mic  
stand in front of him or her. And of course, if the  
engineer or others in the control room want to  
hear the cue mix, they can just plug headphones  
into any of the HA-6AB’s front panel jacks. See  
the section on “Use of the HR-2 Remote Stations”  
for additional details.  
The cue mix heard in the headphones is a com-  
bination of the previously recorded tracks along  
with the new sounds being added. It is generally  
derived from a “Cue” or “Headphone” mixing buss  
on the recording console, which is then routed to  
the Left and Right Inputs on the HA-6AB’s rear  
panel. If this mix is mono, connect it to the Left  
Input. The HA-6AB will then automatically be in NOTE: For studios that require each tracking mu-  
mono mode, so that the mix can be heard with sician to have their own personalized mix, the Fur-  
both ears (and both speakers, if used).  
man HDS-6/HR-6 or the HDS-16/HRM-16 may be  
required as an alternative to the HA6-AB.  
In a small studio, if no more than six sets of head-  
phones are needed, it may be most convenient to The HR-2 Remote Stations connect in “a daisy  
locate the HA-6AB on the studio floor, and plug all chain” fashion to the Speaker B output on the  
headphone sets directly into its front panel. You rear panel of the HA-6AB. This output is an XLR  
may want to put a large, easily readable number connector, so that standard microphone cables  
on each set so that each musician will be able to can be used. The HA-6AB connects to the first  
locate his or her volume control, even if the cables HR-2 box; another mic cable connects the first  
become tangled.  
HR-2 box to the second HR-2 box; a third mic  
cable connects the second HR-2 to the third  
HR-2; and so forth. However, twelve HR-2 is the  
recommended maximum.  
In a larger studio, you may find it more practi-  
cal to use several HR-2 Remote Stations at  
strategic locations around the studio, while the  
Daisy-chaining HR-2 Remote Stations to the HA-6AB  
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H A - 6 A B / H A - 6 A B E M a n u a l  
One or two sets of studio speakers may be con-  
USE OF THE HR-2 REMOTE  
nected to the HA-6AB. If two sets are needed,  
the “B” pair must be connected to the XLR output  
using a custom made cable. HR-2 Remote Sta-  
tions cannot be used in this case.  
STATIONS (SATELLITES)  
The HR-2 Remote Stations may be used to  
increase the number of headphones which can  
be accommodated by an HA-6AB, and to place  
a volume control within reach of each individual  
needing it. They are compact boxes which eas-  
ily attach with a thumbscrew to any microphone  
stand. Each HR-2 has two stereo volume controls  
and two headphone jacks. There are also two  
XLR connectors, one male and one female. These  
may be used to “daisy chain” HR-2 boxes together  
with standard microphone cables. Begin the chain  
at the SPEAKER B - SATELLITE/REMOTE con-  
nector on the rear of the HA-6AB. The HA-6AB  
connects to the first HR-2 box; another mic cable  
connects the first HR-2 box to the second HR-2  
box; a third mic cable connects the second HR-2  
to the third HR-2; and so on. If low impedance  
headphones are used, up to twelve HR-2’s may  
be in the chain. If medium or high impedance  
headphones are used, 25 or more Remote Sta-  
tions may be chained. If desired, the clip on an  
HR-2 box may be hung on a belt if no microphone  
stand is convenient.  
REHEARSAL  
Headphones are used in rehearsal sessions  
not only to avoid disturbing neighbors with loud  
sounds, but also to provide each musician an  
easily controlled mix of all the other tracks. Us-  
ing headphones guarantees that each will hear a  
balanced mix regardless of where they are posi-  
tioned relative to various instruments or speakers  
(a luxury not always available in performance).As  
in recording, a mixing board must be used, whose  
output will drive the HA-6AB either in mono (use  
Left Input only) or stereo (use both inputs).  
The main consideration in locating the HA-6AB is  
whether each musician will need easy access to  
his or her own volume control. If the musicians are  
spread around a large room, the use of a chain of  
HR-2 Remote Stations may be more convenient  
than having each pair of headphones plug directly  
into the HA-6AB.  
LANGUAGE LABS  
Language labs occasionally need to drive as  
many as 50 headphone sets. If more than twenty  
five sets are required, they must be high-imped-  
ance types. HR-2 Remote Stations provide a  
convenient way to place a volume control at  
each listening position (two listeners can share  
each box).  
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H A - 6 A B / H A - 6 A B E M a n u a l  
triggered, the lights will stay lit for a minimum of  
DESCRIPTION OF CONTROLS:  
FRONT PANEL  
50 milliseconds so they can be easily seen, even  
if the actual duration of the overload is much  
shorter.  
INPUT LEVEL: The Input Level control provides a  
means of scaling the effect of the individual head-  
phone volume controls. The Input Level should  
be adjusted so that there is an adequate range  
of volumes available at each listening position,  
so that any listener can be accommodated, and  
the average listener’s volume will be set at about  
halfway. The Input Level control is stereo; it affects  
both left and right channels simultaneously.  
HEADPHONE JACKS / VOLUME CONTROLS:  
Any type of headphones, wired with a standard  
1/4” stereo phone plug, may be used success-  
fully. All six outputs receive the same stereo  
signal. They differ only in the individual volume  
settings.  
SPEAKER-A BUTTON: Depressing this but-  
ton turns on the speakers connected to the  
SPEAKER-Abanana jacks on the rear panel, and  
simultaneously turns off the signal to all the front  
panel headphone outputs.  
SIGNALPRESENT LIGHTS: These yellow LED’s  
turn on whenever a signal exceeding 125 mil-  
livolts RMS (40 dB below full power) is present  
at the HA-6AB’s input jack. They will increase in  
brightness as the signal strength increases. This  
feature is very useful and can provide a clue to  
where the fault may lie if the expected program  
is not heard at the listening stations.  
SPEAKER-B BUTTON: Depressing this button  
turns on whatever is plugged into the SPEAKER-  
B SATELLITE/REMOTE XLR connector on the  
rear panel. This will be either a pair of speakers  
or a chain of HR-2 Remote Stations. Therefore,  
leave this button depressed when using Remote  
Stations. Depressing it does not turn off the front  
panel headphone outputs. See the section on the  
Rear Panel for speaker wiring.  
OVERLOAD LIGHTS: These LED’s glow red to  
indicate an overload in the HA-6AB. If the LED  
lights up, either the drive level to the unit should  
be reduced, or the setting of the Input Level con-  
trol should be reduced until the LED remains off.  
The lights turn on when the signal level at either  
output approaches .5 to 1 dB of clipping. Once  
POWER LIGHT: Glows red when unit is receiv-  
ing power and the ON-OFF SWITCH is in the  
ON position.  
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H A - 6 A B / H A - 6 A B E M a n u a l  
sis ground). The connection from pin 1 to the shell  
REAR PANEL  
is optional on all 3 pin connectors, and can be  
removed if present, by opening up the connector  
on the cable and disconnecting it.  
ON-OFF SWITCH: This switch turns the HA-6AB  
on and off. For convenience, it is recommended  
that the HA-6AB and any other rack-mount  
equipment be powered through a switchable  
outlet box, such as the Furman Sound PL-8 or  
PL-PLUS Power Conditioner and Light Module.  
The PL Series provides an easy way to power up  
the whole rack with one front-panel switch, and  
provides discreet illumination on dark stages and  
studios as well. If you do use a switchable outlet  
box, leave the HA-6AB’s on-off switch in the ON  
position at all times.  
SPEAKER A OUTPUTS: These outputs should  
be used when a pair of speakers is used as an  
alternative to headphones, since the headphones  
are switched off when the speakers are switched  
on. The connections are 5-way binding posts,  
which can accommodate dual banana plugs, bare  
wires, or wires terminated in spade lugs.  
SPEAKER B SATELLITE/REMOTE OUTPUT:  
This output is a single male XLR connector con-  
taining both the left and right channel outputs. It  
is wired as follows: Pin 3-left (high); Pin 2-right  
(high); and Pin 1-low, common to both channels.  
This output should be used as the starting point  
for a chain of HR-2 Remote Stations (satellites).  
It will receive signal whenever the front panel  
SPEAKER B button is depressed. If necessary,  
it may also be used to connect a second set of  
speakers. However, if it is used for speakers, note  
that depressing the SPEAKER B button will not  
switch off the front panel headphone jacks in the  
way that the SPEAKER A button does.  
GROUND LIFT SWITCH: In many installations,  
hum-causing ground loops are formed by the  
common connection of various pieces of equip-  
ment to the power line ground, and by contact  
between chassis, as in a rack with metal rails.  
Sliding the Ground Lift switch up completely  
isolates all signal grounds from the chassis,  
breaking any ground loops. The chassis always  
remains connected to the ground pin on the AC  
cord for safety and to provide shielding against RF  
interference. Try both positions of the Ground Lift  
switch, and leave the switch in the position that  
results in the least hum in your system.  
INPUTS: Quarter-inch (mono) phone jacks are in-  
tended for line level signals such as the outputs of  
a mixer. Microphones and/or instrument pickups  
may not have strong enough outputs to drive the  
Note: The ground lift can be rendered ineffective  
by 3 pin audio connectors that tie pin 1 (signal  
ground) to the metal shell of the connector (chas-  
GROUND  
LIFT  
SPEAKER A  
SPEAKER B  
CAUTION!  
120 VAC  
50/60 Hz  
130 Watts  
RISK OF ELECTRIC SHOCK. DO NOT OPEN.  
REFER SERVICING TO QUALIFIED SERVICE  
PERSONNEL. TO REDUCE THE RISK OF FIRE  
OR ELECTRIC SHOCK DO NOT EXPOSE THIS  
EQUIPMENT TO RAIN AND MOISTURE.  
ON  
HEADPHONE/  
MONITOR  
®
®
LEFT  
RIGHT  
LISTED  
7Z37  
AVIS:  
RISQUE DE CHOC  
ELECTRIQUE -- NE PAS OUVRIR  
PROFESSIONAL  
AUDIO EQUIPMENT  
OFF  
AMPLIFIER  
RIGHT INPUT  
LEFT INPUT  
SATELLITE / REMOTE  
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H A - 6 A B / H A - 6 A B E M a n u a l  
HA-6AB directly without first being preamplified. The input connectors are stereo 1/ 4” phone jacks.  
The 1/4” phone inputs are stereo jacks (tip-ring- In the HA-6AB, these will be paralleled by XLR  
sleeve) wired for a balanced input. If a mono connectors. If a mono plug is inserted, the ring  
phone plug is inserted, the input will automatically connection will be grounded through the body of  
be converted to unbalanced. If using a mono sig- the plug, converting the differential amplifier to a  
nal plug into the left ¼” jack the HA-6AB will send noninverting amplifier. After the buffers, the left  
signal to both left and right channels.  
and right signals proceed to the two decks of the  
The HA-6AB is also equipped with left and right stereo Input Level control.  
balanced female XLR connectors in addition to  
The HA-6AB’s power amplification is derived from  
the standard 1/4” phone jacks. Balanced lines  
offer the benefits of cancellation of hum, noise,  
and RF interference which may be picked up in  
the interconnecting cables. For balanced con-  
nections, shielded twisted pair cable must be  
used. The wiring is as follows: Pin 1-shield; Pin  
2-signal positive; and Pin 3-signal negative. The  
XLR inputs can not be used in mono like the ¼”  
input jacks.  
a pair of LM1875 integrated circuits, which have  
internal short-circuit and thermal overload pro-  
tection. They are set for a voltage gain of 26 dB.  
The LM1875’s drive the speaker outputs directly.  
The headphone outputs first pass through special  
high-power pots wired as volume controls.  
The HA-6AB’s power supply provides +/-24 volts  
unregulated to the LM1875 stages, which may  
drop to +/-20 volts under full load. A network of  
dropping resistors and zener diodes provides ±15  
volts to the rest of the circuit.  
CIRCUIT DESCRIPTION  
Both the Overload LED’s and the Signal Present  
LED’s monitor signal levels at the output (before  
the volume controls).  
CAUTION! This section is intended to assist the  
professional user with considerable experience  
in electronics to achieve a better understand-  
ing of the operation of the HA-6AB. Under no  
circumstances should persons without electron-  
ics troubleshooting experience and training un-  
dertake repairs on their own. There are no user  
serviceable parts inside the HA-6AB.All problems  
should be referred to the factory or to other quali-  
fied service personnel.  
INSTALLATION  
The HA-6AB is intended for mounting in  
standard 19” equipment racks. Standard racks  
come equipped with mounting rails with holes  
tapped for 10-32 machine screws. Be sure to  
use only 10-32 screws (in particular, avoid 10-  
24 screws, which will fit if forced but will strip  
the threads). To avoid marring the panel when  
tightening the screws, use nylon washers under  
the screw heads.  
The inputs to the HA-6AB proceeds from the  
input connectors to op-amplifier buffers wired as  
differential (balanced) amplifiers.  
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H A - 6 A B / H A - 6 A B E M a n u a l  
For best results, the input cables plugged into  
the HA-6AB should be shielded. Balanced  
connections should use shielded, twisted-pair  
cable. Headphone cables and speaker cables  
do not need to be shielded, though no harm is  
done if shielded cables (such as microphone  
cables) are used.  
warranty card or on-line website registration.  
Shipping charges to the Furman factory or to an  
authorized repair location must be prepaid by the  
Purchaser of the product. Manufacturer shall, at  
its own expense, furnish a replacement Product  
or, at Manufacturer’s option, repair the defective  
Product. Return shipping charges back to Pur-  
chaser will be paid by Manufacturer.  
THREE YEAR LIMITED  
WARRANTY  
Furman Sound, Inc., having its principal place  
of business at 1997 South McDowell Blvd.,  
Petaluma, CA 94954 (“Manufacturer”) warrants  
its HA-6AB (the “Product”) as follows:  
THE FOREGOING IS IN LIEU OF ALL  
OTHER WARRANTIES, EXPRESS OR IMPLIED,  
INCLUDING BUT NOT LIMITED TO THE IM-  
PLIED WARRANTIES OF MERCHANTABILITY  
AND FITNESS FORAPARTICULAR PURPOSE.  
Manufacturer does not warrant against damages  
or defects arising out of improper or abnormal  
use of handling of the Product; against defects  
or damages arising from improper installation,  
against defects in products or components not  
manufactured by Manufacturer, or against dam-  
ages resulting from such non-Manufacturer made  
products or components. This warranty shall be  
cancelable by Manufacturer at its sole discre-  
tion if the product is modified in any way without  
written authorization from Furman Sound. This  
warranty also does not apply to Products upon  
which repairs have been affected or attempted by  
persons other than pursuant to written authoriza-  
tion by Manufacturer.  
Manufacturer warrants to the original  
Purchaser of the Product that the Product sold  
hereunder will be free from defects in material and  
workmanship for a period of three years from the  
date of purchase. The Purchaser of the product  
is allowed fifteen days from the date of purchase  
to complete warranty registration by mail or on-  
line at the Furman website. If the Product does  
not conform to this Limited Warranty during the  
warranty period (as herein above specified),  
Purchaser shall notify Manufacturer in writing of  
the claimed defects. If the defects are of such  
type and nature as to be covered by this war-  
ranty, Manufacturer shall authorize Purchaser  
to return the Product to the Furman factory or to  
an authorized Furman repair location. Warranty  
claims should be accompanied by a copy of the  
original purchase invoice showing the purchase  
date; this is not necessary if the Warranty Reg-  
istration was completed either via the mailed in  
THIS WARRANTY IS EXCLUSIVE. The  
sole and exclusive obligation of Manufacturer  
shall be to repair or replace the defective Prod-  
uct in the manner and for the period provided  
above. Manufacturer shall not have any other  
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H A - 6 A B / H A - 6 A B E M a n u a l  
obligation with respect to the Products or any  
part thereof, whether based on contract, tort,  
strict liability or otherwise. Under no circum-  
stances, whether based on this Limited Warranty  
or otherwise, shall Manufacturer be liable for  
incidental, special, or consequential damages.  
Manufacturer’s employees or representatives’  
ORALOR OTHER WRITTEN STATEMENTS DO  
NOT CONSTITUTE WARRANTIES, shall not be  
relied upon by Purchaser, and are not a part of  
the contract for sale or this limited warranty. This  
Limited Warranty states the entire obligation of  
Manufacturer with respect to the Product. If any  
part of this Limited Warranty is determined to be  
void or illegal, the remainder shall remain in full  
force and effect.  
SERVICE  
Before returning any equipment for repair, please  
be sure that it is adequately packed and cush-  
ioned against damage in shipment, and that it is  
insured. We suggest that you save the original  
packaging and use it to ship the product for ser-  
vicing. Also, please enclose a note giving your  
name, address, phone number and a description  
of the problem.  
NOTE: All equipment being returned for repair  
must have a Return Authorization (RA) Number.  
To get an RA Number, please call the Furman  
Service Department, (707) 763-1010, Ext. 120 or  
121, between 8 am and 5 pm U.S. Pacific Time.  
Please display your RA Number prominently on  
the front of all packages.  
10  
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H A - 6 A B / H A - 6 A B E M a n u a l  
11  
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Furman Sound, Inc.  
1997 South McDowell Blvd.  
Petaluma, California 94954-6919 USA  
Phone: 707-763-1010  
Fax: 707-763-1310  
081403-B  
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