Audio research bl 1 brochure

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Model BL!
Balanced Line Driver

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With the advent of the new fully~balanced
"V" series power amplifiers from Audio
Research. it was apparent that some
accommodation was necessary for those
music lovers who lacked balanced- -output
preamps and yet who didn't want to
change that part of their system. There are
also those who haven' 1 yet been able to
take full advantage of balanced-input oper-
ation of the D240 MK II or D400 ampli-
fiers. The answer is now available to all
Audio Research owners.

The BL1 Balanced Line Driver is a highly
sophisticated, active phase inverter with
its own internal power supply Its design
gave top priority to superb transparency
natural musical dynamics and accurate
preservation of phase and time relation-
ships to assure the vivid, three-dimension-
al soundstaging that the "V" series amps
are so capable of. Normally. it will be used
between any single-endedoutput preamp
and a "V" amplifier. but other applications
are possible as well.

Physically. the BL1 is a black
anodized. vented aluminum out-
board box 13" W X 7 D x 3" H
mounted on four rubber feet. It can
be neatly tucked away on a shelf or
on the floor next to a "V" amp. The
front has a single green LED to
indicate power on: the power
switch itself is located on the back.
Drawing less than 15 watts of AC
power. the all-solid-state BL1 can
be left on continuously. Input

impedance is 1.5 rnegohms. while output
impedance at each XLR is 60 ohms. L and
R "RCA inputs are located on the back.
with an adjoining I. and R XLR connector
for the desired balanced output.

Sonically. the BL1 Is nothing short of
amazin The amount of improvement
you wtl hear from any single ended pre-
amp in terms of lower noise. reclsion of
soundstaging and improved ynamics ls
simply remarkable Systemsy requiring
long interconnect lengths are especially
enhanced over single ended operation-
relevant to both studio and other commer-
cial applications.

Because of its almost ideal impedance
characteristics (easy load and solid source),
you will find that the BL1 significantly
improves almost any single-ended source -
such as a CD player or digital converter-
when used to provide the input to the
balanced-input LSZ-B. This application

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represents a whole new method of putting
new life into existing components.

The BL1 is handcrafted to the same exact-
ing standards as every other Audio
Research product. and is covered by a
Three-Year Limited Warranty. See your

nearest authorized Audio Research retailer

for more information.

BL1 SPECIFICATIONS

FREQUENCY RESPONSE: dc to 500 KHz.
(vadB point)

DISTOFITION: Less than .01 % at 2V FIMS out-
put. (Typically less than 002% at 1KHZ)

GAIN: Bdbr

INPUT IMPEDANCE: 1.5 Meg ohms.

OUTPUT IMPEDANCE: 60 ohms balanced.
OUTPUT DC OFFSEI: Less than 2mV dc.
OUTPUT BEFORE CLIP: 18V HMS out bale
anced (9V HMS Input) 16V RMS out into 600
ohm balanced load.

NOISE: Less than 18 uV RMS balanced IHF
weighted

POWER REQUIREMENTS: 100-135
VAC GOHZ (200-270 VAC 50/60 Hz) 15
watts max.

DIMENSIONS: 13" W X 3" H X 7" D.
WEIGHT: 4.4 lbs. (2.0 kg) net: 7.0 lb.
(3.0 kg) Shipping.

Three-Year Limited Warranty

All Audlo Rest-arch products are backed
by a Three- Year Limited Warranty For
one year Irom date of purchase Audio
Research pays round-111p freight charges
on any rtiuipineni requiring warranty ser-
vice at the Iatto1y See your authorized
Audio Research dealer for details

@1992 Audio Research Corporation

5740 Green Circle Drive / Minnetonka, Minnesota 55343-4424 / Phone: 612939-0600 FAX: 612-939-0604