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January 12th, 2013 07:02 AM #1
Hi audio peeps! I need advice. I just received my 900W PA D5000.5 amp from Amazon and installed it yesterday. Before the installation of the PA D 5-channel amp, I had our temp amp (an old 300W Fenton 4-channel to power my MM6501 seps (front) and DB651 coaxials (rear) - no sub yet. With the temp amp, I had no noise besides the high-pitched powering off sound when amp is turned off
But with the PA D5000.5 amp, I'm getting some hiss/whine even if:
1) Radio is OFF (same scenario if my volume is set to 0 or fader/balance set to extremes)
2) RCA inputs are NOT plugged to the amp
3) Engine is OFF (I get engine whine in addition when engine is on).
Here's the thing: when I turn on the radio and adjust the radio volume/fader/balance so a speaker plays a sound. The hiss from that particular speaker is gone even I turn the radio off (and on again) afterwards or just the particular speaker "off" using fader/balance controls. This is true even when I start the engine.
But any speaker that hasn't played a sound since initially switching the car from OFF to ACC will have the hiss/whine
The hiss doesn't increase with the volume.
NOTE: My remote on wire is connected to the car's ACC so the amp turns on immediately even when my radio is OFF. Unfortunately, my factory head unit doesn't have a remote out.
But then again, with the temp amp, this doesn't matter, I don't have this noise at all.
What to do?
We're thinking of the following possibilities:
- Static
- Amplifier Ground Cable placement (Gauge 4 na as it is) - With the Fenton it's OK but with the more powerful Polk hindi siguro?
- Other Ground? - Kaso hiss is there even when the RCAs are unplugged
- Defective Amp - Huwag naman siguro, I had this shipped from the US
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