Phonic PCR2213, Руководство пользователя, Страница: 20 / 29

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5.2 2-WAY SYSTEM LEVEL SETTING
Properly setting level guarantee best performing system. Please follow the recommended procedure for best
speaker system.
1.
All system power off.
2. Connect the pink noise generator (on RTA or CD), the signal source required by the test instrument and
variable frequency signal generator onto the main mixer.
3. Connect the measurement microphone to the instrument.
4. Make sure all the signal wiring is done properly setting on PCR2213 is done correctly.
5. Graphic equalizer at flat setting (or bypass).
6. Compressor/limiter at bypass setting.
7. All level control on power amplifiers at minimum.
8. Un-mute all output of PCR2213.
9. Turn on the system except power amplifiers.
10. Connect AC volt meter at the low output of the PCR2213 under test.
11. Make sure all mute switches and phase invert switches are not pressed. The limiter is off, subsonic filter
is off and the horn EQ is not engaged.
12. Set the crossover point [8] as design, send in the sine wave from function generator at half of the cross-
over frequency. Adjust the channel fader and master fader to 0VU on the mixer.
13. Read the AC volt meter, it should be around 0dBu depending on the 0VU reference point of the mixer and
the crossover point.
14. Change the frequency of the function generator to the crossover point.
15. Adjust the crossover frequency knob [8] slowly around the crossover frequency. Read the AC volt meter
until it is 3dB lower than previous step. This is the exact position of the crossover point. Mark the position
with a pencil.
16. Repeat the same procedure from step 10 to 14 with another channel crossover point.
17. Measure the axis distance between the bass speaker and high frequency driver (speaker), and calculate
the approximate delay time to compensate the difference. Ref to 5.3 for detail.
18. Now, shut down all signal source. Make sure there is no output from the mixer by reading the level meter
on the mixer.
19. Press down all the mute switches of PCR2213 except the HF output.
20. Turn on only the HF power amplifier with input level at minimum.
21. Send in the pink noise to the mixer, adjust the level until reaching –10dB.
22. Slowly turn up the level control of the HF power amplifier, make sure you are listening the HF sound
clearly from the HF speakers. If you heard fussy HF sound from the bass speakers (It is hard to tell MF
coming from MF or LF speakers), turn off the system and check system wiring thoroughly. It is highly
possibly that the LF signal was send into HF speaker. If you turn on the LF first, HF speaker will be blown
already.
23. OK, now the HF is correctly sent into HF speaker(s). Un-mute the LF output, and mute the HF output.
24. Slowly turn up the level control of the LF power amplifier, you should hear strong LF sound from the LF
speakers.
25. Un-mute the HF, and turn up the level until the LF and HF is about balanced.
26. Turn up HF, MF and LF level until the sound pressure level reached 10dB below designed operating
level. (If you set the operating at 90dB, you shall reach 80dB.)
27. Press down the low cut if you’re using vented LF speaker which doesn’t extend to 30Hz or lower.
28. Press down the Horn EQ if you’re using HF horn which is constant directivity design.
29. Refer to 5.5 for limiter adjustment.
30. Fine tune the system with the steps instructed by the test instrument you are using. Please note the delay
time can also be fine tuned with precision instrument such as ETF or TEF which include time domain