US Blaster USB 7132, Owner'S Manual

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USB 7132 / 7133 / 7134
Professional Power Amplifier
CALCULATING IMPEDANCE
Measured in ohms, impedance is a measure of AC resistance. Loudspeakers generally come in 16, 8
or 4 ohm varieties. Amplifiers have a low limit to what impedance they can drive without being
overloaded, there is not usually an upper limit. The PA series can drive any impedance between an
open circuit and no less than 2 ohms when in stereo and between an open circuit and no less than
4 ohms when bridged.
If the speakers are wired in series, just add their impedances together. If they are in parallel there is
a simple rule: two impedances the same will equal half the individual impedance, for example 8 & 8
= 4 or to take this further, four 8 ohm drivers = 2 ohms (16 & 16= 8 / 8 & 8 = 4 / 4 & 4 = 2).
Table for specification
ITEMS CONDITIONS USB 7132 USB 7133 USB 7134
8 Ohms 0.1% 200W RMS 300W RMS 450W RMS
THD 1KHz x 2 Channel x 2 Channel x 2 Channel
4 Ohms 0.1% 300W RMS 400W RMS 700W RMS
THD 1KHz x 2 Channel x 2 Channel x 2 Channel
OUTPUT 2 Ohms 0.1% 400W RMS 500W RMS 900W RMS
POWER THD 1KHz x 2 Channel x 2 Channel x 2 Channel
Bridged Mono
8 Ohms 0.1% 600W RMS 850W RMS 1400W RMS
THD 1KHz
Bridged Mono
4 Ohms 0.1% 800W RMS 1000W RMS 1800W RMS
THD 1KHz
Power 1W
0.2% 0.25% 0.3%
DISTORSION
4 Ohms 1KHz
Rated power
0.03% 0.055% 0.06%
4 Ohms 1KHz
INPUT Output rated power
775 ±30mV 950 ±30mV 1400 ±30mV
SENSITIVITY (Level at Max.)
VOLTAGE GAIN Output rated power 31dB 31dB 31dB
Rated power 1 KHz
0.2% 0.25% 0.3%
S/N RATIO
+A (Level at Mid)
FREQUENCY 1 KHz=0dB/-0.5dB
10--30K 10--30K 10--30K
RESPONSE (Level at Max.)
Rated power
67 dB 70 dB 65.5 dB
CH . SEPERATION
4 Ohms 1KHz
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