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Models 2251 and 2251SA Crossover Driver Module Specifications
Type
Crossover
Frequencies
2-way or 3-way electronic crossover card
with 3 driver amplifiers and an output
switch matrix.
625 Hz, 800 Hz, 1250 Hz, 1600 Hz (Low/
Mid); 3150 Hz, 4000 Hz, 5000 Hz, 8000 Hz
(Mid/High).
Minimum Load
Impedance on
Special Input/Output
Jacks J213, J214,
J215
3000 Ohms (actual output impedance is
2700.
Switches
12dB/octave
3 DIP (dual inline package) output bus
matrix switches-8-SPST
switches per
DIP; 1 "Bl/TRI" switch, 2 Crossover Fre-
quency Switches.
Slope Rate
Frequency
Response
Each filter is - 3 dB at the selected
crossover frequency. The LOW output is
less than - 0.5 dB at 20 Hz; the HIGH
output is less than - 0.5 dB at 20 kHz. All
filters are essentially flat within their
respective passbands.
Driver Amplifiers
x 57.3 (35.2 ± .2 dB voltage amplifica-
tion) amplifiers designed specifically to
drive the Models 2275 and 2276 Power
Amplifiers.
Phase Response
Total Harmonic
Distortion
Hum and Noise
All filters conform to standard "butter-
worth" phase response within ± 20°
Less than 0.1 % from 20 Hz to 20 kHz
from any driver amplifier
output, all
attenuators at full CCW rotation.
95 dB Signal to Noise ratio at driver amp-
lifier outputs with equal channel gains.
Attenuators
Model2251
3 driver amplifiers,
one each for the
HIGH, MID and LOW outputs. Driver
amplifiers drive the Models 2275 and
2276 Power Amplifiers but do not drive
the Special Input/Output
Jacks J213,
J214 and J215. Mid Output may be used
as a full-range channel in bi-amplifier
mode with an input attenuator acces-
sible through J214.
LOW, HIGH and MID driver amplifiers
have 50K ohm audio taper input attenu-
ators with at least 60 dB attenuation at
maximum CCW rotation.
Maximum Voltage
Amplification from
2220 Input to Special
Input/Output Jacks
J213, J214 or J215
+
15.0 dB (
+
11.5 dB in bi-amplifier) to
J213 ("HIGH" output):
+
11.5 dB to J214
("MID" output): - 0.5 dB to J215 ("LOW"
output). Note: LOW, HIGH and MID att-
enuators do not affect the output level at
the Special Input/Output
Jacks J213,
J214andJ215.
Model 2251SA
LOW, MID and HIGH driver amplifiers
each have a six-position DIP switch att-
enuator
with
sumable
steps
of
1-2-4-8-16-32 dB (maximum 63 dB attenu-
ation).
Model 2275 Power Amp I ifier Specifications*
Power Output
Power Output at Clipping
Frequency Response
Total Harmonic Distortion
Damping Factor
Actual Output Impedance
Hum and Noise
Separation Between Any
Two Model 2275's
Phase Shift
Offset Voltage
Indicator
Fuses
Individual Model 2275 Driven
by
Model 2250 or
2252 Driver Card with Model 2220 Input Card
75 watts continuous average sine wave power into
a 16-ohm load impedance.
90 watts at 1 kHz into a 16-ohm load impedance.
+
0, - 0.5 dB from 20 Hz to 20 kHz
Less than 0.25% from 20 Hz to 15 kHz
Less than 0.03% at 1 kHz, 75 watt output into
16-ohms
57:1@ 100 Hz
0.28 ohm in series with 10 microhenries
96 dB signal to noise ratio
75dB@ 1 kHz
Less than± 15°from20Hzto20kHz
Less than ± 50 mV DC
Eight Model 2275's in Parallel/Bridge Mode
Driven by Model 2250 or 2252 Driver Card with
Model 2220 Input Card
600 watts continuous
average sine wave power
into an 8-ohm load impedance.
675 watts at 1 kHz into an 8-ohm load impedance.
+
0, - 0.5 dB from 20 Hz to 20 kHz
Less than 0.25% from 20 Hz to 15 kHz
Less than 0.05% at 1 kHz, 600 watt output into
8-ohms
57:1@ 100Hz
0.14 ohm in series with 5 microhenries
93 dB signal to noise ratio
(Does not apply)
Less than ± 20 • from 20 Hz to 20 kHz
Less than ± 100 mV DC
One red LED "ON" indicator per2275turns off in the event of module failure.
(2) AGC-style 2.5 amp "fast blow" fuses per 2275 Power Amplifier
* These specifications apply only to 16-ohm operation
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