Specification - Fender Passport PD-250 Service Manual

When we use the term dB to indicate a voltage amplification factor (gain), no reference is implied. 101 dB of
Voltage Amplification means that if you take 20 time the Log (base 10) of the output voltage divided by the input
voltage, the answer will be 101 dB
When we use the term dBu to indicate a voltage level, we are implying a 0.775 volt reference voltage level. Thus, a
voltage level expressed as +4 dB was calculated by taking 20 times the log (base 10) of the actual voltage (1.23
volts) divided by the reference voltage (0.775 volts)
The choice of a 0.775 volt reference was not arbitrary. dBm is a common method of rating power levels (as
opposed to our voltage level ratings). The 0 dBm reference is one milliwatt (1/1000th watt). If an output device pro-
duces 0 dBm into exactly 600 ohms, the voltage level is 0.775 volts. Thus, for true 600 ohm lines, the dBm power
terminology and our dBu voltage terminology are equivalent.
Specifications are subject to change without notice.
System:
Frequency Response:
Distortion:
Signal to Noise Ratio:
Processor Frequencies:
Microphone EQ:
Stereo EQ:
System EQ:
Gain Stages:
(Gain Switch set to high)
Power Output:
Return Input Impedance:
Channel Separation:
Aux Return Sensitivity:
20Hz. to 40kHz ±1dB (at tape output)
30Hz. to 30kHz ±2dB (at speaker output with processor threshold exceeded)
<0.05% 20Hz. to 20kHz. @ below rated output
>70dB @ 1W, DIN A
Level sensitive with boost at 70Hz. and 15kHz.
Specially designed combinations of boost and cut.
±12dB @ 50Hz., ±15dB @ 15kHz.
Specially designed for differing acoustic environments.
+54dB ±2dB (Microphone input to send outputs)
+24dB ±2dB (line input to send output)
+0dB ±2dB (Stereo to tape output)
+12dB ±2dB (Stereo to send output)
+32dB ±2dB (Return to speaker output)
125W/CH @ 8 ohms with both channels driven with THD < 1%
47k ohms
>40dB @ 1kHz.
0dBu for rated output power @ 1kHz.
4
PASSPORT
POWERED PORTABLE
SOUND SYSTEM
SPECIFICATIONS