Power Acoustik PEQ-72 Owner's Manual

Equalizer but who also desire higher audio power level capabilities than can be obtained in an in-dash unit. It contain stereo power amplifiers to drive speakers directly. and 1 subwoofer pair (with crossovers and sen- sitivity control). Subwoofer output can be connected to remote high-power amplifiers. The seven center-frequencies are concentrated in .the critical 60Hz to 15kHz region where compensation is most needed.

1. FADER. Allows front to rear balancing in four speaker 5. ADJUSTABLE SUBWOOFER GAIN CONTROL. systems for best directional imaging. Allows user to adjust subwoofer output to match 2. EQ. Press in to engage the equalizer circuitry. Press overall system output. it (outer position) the result is the same as setting all 6. SPECTRUM ANALYZER DISPLAY. A 5 coluns, Red- slide controls to center position. It is useful in judg- color LED Display shows the instantaneous, peak ing the result of your EQ Settings. level for the frequency content of the source musicad- 3. SUBWOOFER SWITCH ding yet another dimension to your visual enjoyment. When the subwoofer is connected, use this switch 7. EQ SLIDE CONTROLS. Each slide controls the to activateldeactivate the subwoofer. amount of boost or cut in one small part of the total 4. SUBWOOFER COSSOVER POINTS. Two operating audio frequency range. With all slides in the center modes. The SUBWOOFER MODE activates an inter- position, the overall frequency response is tlat. By nal low-pass filter so only'the deepest bass notes are moving any slide up or d ~ w n , the output within the passed to the woofer system. Two position 80Hz or band is increased or decreased by up to 12 db. 150Hz.

above or below a standard DIN size radioltape player. Installation Kits for the purpose are available from a varie ty of suppliers. Consult with a professional Auto-sound installer for assistance. The Red wire with in-line fuse is the main power input to the PEQ-72. It should be connected to a source of Switched + 12 volts (Cut off by the Ignition switch). This is normally the same fuse-panel terminal that powers your radio. Each wire is individually labeled to reduce any chance of error. Phono cable pairs with plugs on both ends are required to connect the PEQ-72 outputs to the remote amplifiers and also for the phono inputs if used. See Figure 5. These can be purchased from a local audio dealer in the correct lengths for your particular installation. The Black wire labeled Power Ground is connected directly to the vehicle chassis. A second Black wire with White stripe labeled Source Ground is connected to the chassis of the in-dash radio. This dual-ground system is helpful in reducing common sources of noise generated by your vehicle. The Orange wire is used on turn the PEQ-72 On. It should be connected to the in-dash radio's Power Anten- na Output Lead. The final step in the electrical installation is to connect the Left & Righr Output signals from your radio to the PEQ-72. Inputs in one of two ways, depending on how your radio is equipped. If it has Phono-style Line Out- puts, then they are connected to the matching Line In- puts using a purchased cable pair as discussed above and shown in Figure 5.

Normal Operation: EQ SLIDES to their center positions. Switch to ignition or accessory on and turn on the radio The purpose of a MULTI-BAND equalizer is to compen- but at low volume. The light in the PEQ-72 should now sate for the fact that no speaker is perfect and, more be lit. If nothing happens, check the black, red, or orange importantly, that even a perfect speaker will product im- connections and the in-line fuses if necessary. perfect soundpressure levels versus frequency when placed in a real motor vehicle. It is possible to correct If all OK so far, then by raising the radio volume should produce speaker output. Next rotate the radio balance control to verify sound moves from full right to full left. If it is reversed then the inputs to the PEQ-72 are revers- ed. If you are using four speakers then rotate the FADER control to verify the PEQ-72 outputs are going to cor- rect speakers. SUBWOOFER OUTPUT: If you are using the subwoofer output, try the two different settings. Each position allows a different range of bass frequency thru. Because deep bass stands out more we've provided a subwoofer gain control. This will allow you to adjust the amount of bass output needed to match the rest of your system. these problems by boosting or cutting the speaker in- put power at the proper frequencies. This is the basic purpose of the power acoustik PEQ-72. The task of finding the best combination of EQ settngs to produce the desired resultequal sound-pressure levels at your ears for equal recorded signal level at any frequency-depends mainly on your ears. However, there are several starting points to guide you.

the lowest frequencies due to the large amount of air that must be moved. However, speaker woofer cones resontate between 4560Hz where output is higher so do not boost too much at 60Hz. Use heavy boost at 150Hz, Less boost at 400Hz. 2. Due to sound-wave reflections between the front and rear windshields of a typical vehicle, there may be heavy loss between 700Hz to 1.3kHz so moderate boost here is very effective and will create more "presence" for vocalists. 3. The mid-range from 3 to 6kHz should not require much change from flat (center) Most speakers work well here. Adjust per your taste. 1 4. Due to limitations in human hearing. sound above I 8kHz is not heard very well. Moderate boost at 1 kHz adds a crisp charactr when percussion instruments are present.

Equalization Range: +I - 12dB nom, at each center freq. High level Inputs: Impedance: 100 ohms Max. Sensitivity: 3 volts nom. for full output. Low level Inputs: Impedance: 12K ohms Max. Sensitivity: 500mv. nom. for full output Crossover Rolloff: 12 dBloctave POWER AMPLIFIER Output Power: 50 watts maximum per channel into 4 ohms. 18 watts per channel at less than 1% THD. (14.0 volts D.C. Supply) Frequency Response: 20Hz to 20KHz. + I - 3 dB at 1 watt. Residual Output Noise: Less than 1 .OmV UNWEIGHTED with slide controls at center position. Power Requirement: 11 -1 6 volts D.C. negative ground. 5 amps maximum. Accessories Included: Mounting Brackets, Hardware, Installation instructions. Dimensions (W x H x D): 7" x 1 " x 5-1 12" 1 7 8 x 2 5 ~ 141mm Due to our continuing efforts towards product improvement, the above specifications are subject to change without notice.