Limited Warranty
Audio Research Corporation products are covered by a
3-Year Limited Warranty or a 90-Day Limited Warranty
(vacuum tubes). This Limited Warranty initiates from the
date of purchase, and is limited to the original purchaser, or
in the case of demonstration equipment, limited to the
balance of warranty remaining after original shipment to
the retailer or importer.
In the United States, the specific terms, conditions and
remedies for fulfillment of this Limited Warranty are listed
on the warranty card accompanying the product in its ship-
ping carton, or may be obtained from the authorized
retailer or from the Audio Research Customer Service
Department. Outside the United States, the authorized
importing retailer or distributor has accepted the responsi-
bility for warranty of Audio Research products sold by
them. The specific terms and remedies for fulfillment of
the Limited Warranty may vary from country to country.
Warranty service should normally be obtained from the
importing retailer or distributor from whom the product
was purchased.
In the unlikely event that technical service beyond the abil-
ity of the importer is required, Audio Research will fulfill
the terms and conditions of the Limited Warranty. Such
product must be returned at the purchaser's expense to the
Audio Research factory, along with a photocopy of the
dated purchase receipt for the product, a written descrip-
tion of the problem(s) encountered, and any information
necessary for return shipment. The cost of return shipment
is the responsibility of the purchaser.
Specifications
POWER OUTPUT
: 220 watts per channel into 8 ohms from
20Hz to 20kHz. 380 watts per channel into 4 ohms.
POWER BANDWIDTH:
(-3dB points) 2Hz to 80kHz.
FREQUENCY RESPONSE:
(-3dB points at 1 watt)
0.5Hz to 200kHz.
INPUT SENSITIVITY:
4.0V RMS BAL for
rated output. (20.8 dB Bal gain into 8 ohms.)
INPUT IMPEDANCE:
300K ohms Balanced, 150k ohms SE.
OUTPUT POLARITY
: Non-inverting. Balanced input pin 2+
(IEC-268).
OUTPUT REGULATION:
Approximately 0.07dB 8 ohm load
to open circuit (Damping factor approximately130).
OVERALL NEGATIVE FEEDBACK:
None.
SLEW RATE:
20 volts/microsecond.
RISE TIME:
1.6 microseconds.
HUM & NOISE:
Less than 0.1mV RMS – 112dB below rated
output (IHF weighted, input shorted).
POWER SUPPLY CAPACITANCE:
200,000 uF.
POWER REQUIREMENTS:
105-125VAC 60Hz (210-250VAC
50Hz) 750 watts at rated output (220 WPC 8 ohms) 1200
watts max (380 WPC 4 ohms) 250 watts idle.
TUBES REQUIRED:
2 – 6H30 Driver, 2 – 6922 Voltage amp.
DIMENSIONS :
19" (48.3 cm) W x 8.75" (22.2 cm) H x 19.5"
(49.5 cm) D. Handles extend 1.5" (3.8 cm) forward.
WEIGHT:
58.9 lbs. (26.8 kg) Net; 73.8 lbs. ( 33.6 kg ) Shipping.
Specifications subject to change without notice.
©2007 Audio Research Corporation.
5
Model HD220
