I replace a 4 zone amp with a new 6zone x 60w amp for my local golf club, the existing speakers are 100v line and it worked great. I added a new zone with 3 new 100v line speakers I bought (1.5/2.5/5/10/15 tapping) no matter what wattage I select as soon as I connect them I get this pulsating squeal sound. New to this so not sure what is happening. Ran a temporary cable to an open area to test them without any possible interference and they did the same thing. Not sure how to resolve. Any help?
Sounds like the amplifier has a serious impedance mismatch. Check the speakers are wire as 100v line and check the impedance of the line with your 100v line impedance/power meter, without the new speakers firstly.
Ok, not got one of those meters. I thought that was the benefit of the line transformer to adapt the impedance and all you had to worry about was not exceeding the total wattage.
Speaker Specs:
Speaker Size: 200mm
Colour: White
Speaker Type: Fire / Evac 100V Twin Cone
Driver Used: C 2118B
Power taps: 1.25, 2, 5, 10, 15W
SPL 1W @ 1m: 94dB
Freq. response: 55Hz - 15kHz
Amp Specs:
Brand Power Dynamics
Playback options BT streaming, SD, USB
Output power: RMS 360W
Impedance 100V, 4 Ohm, 8 Ohm
Frequency response 100Hz - 24.000Hz
Power supply 220-240VAC 50Hz
Power consumption 2A
Thx for response JonSnell, not really do this stuff often and is love job for the club as they got no money, hopefully can swap speakers :-/
Speaker Specs:
Speaker Size: 200mm
Colour: White
Speaker Type: Fire / Evac 100V Twin Cone
Driver Used: C 2118B
Power taps: 1.25, 2, 5, 10, 15W
SPL 1W @ 1m: 94dB
Freq. response: 55Hz - 15kHz
Amp Specs:
Brand Power Dynamics
Playback options BT streaming, SD, USB
Output power: RMS 360W
Impedance 100V, 4 Ohm, 8 Ohm
Frequency response 100Hz - 24.000Hz
Power supply 220-240VAC 50Hz
Power consumption 2A
Thx for response JonSnell, not really do this stuff often and is love job for the club as they got no money, hopefully can swap speakers :-/
I replaced the old wiring. I thought maybe the wire got damaged when pulled through the ceiling, so I ran another wire temporarily on the floor to an open area and tested the speakers......same problem. Tried with multiple speakers, tried with one speaker, tried adding an old speaker to it(and ironically by itself, the old speaker worked fine. As soon as I added the new speakers it made the old speaker squeal as well). I tried with all other zones disconnected, I tried connecting to other outputs, I disconnected all inputs, regardless of what setup the speakers would have this pulsating squeal
Is there anything like a paging mic near those speakers? And if you zero out all teh amp controls does it have any effect?
Just for testing, disconnect 3 of the old speakers and connect the 3 new ones in their place, one by one.
What happens?
If problem repeats and only with the new ones, then there is something very wrong with their internal wiring (not the wall embedded wires).
Some distributed PA speakers such as those offer the expected 100V IN - various wattage OUT transformers but also a "direct" input, say 8 ohm, so you can connect them straight to "normal" amplifiers (even Hi Fi ones) without line transformers, for local use (as in inside a room), check that you didn´t connect those terminals by mistake.
Again, add them one by one, and to confirmed working distribution lines.
Please post here exact brand and model, even better a link to their user/installation manual.
What happens?
If problem repeats and only with the new ones, then there is something very wrong with their internal wiring (not the wall embedded wires).
Some distributed PA speakers such as those offer the expected 100V IN - various wattage OUT transformers but also a "direct" input, say 8 ohm, so you can connect them straight to "normal" amplifiers (even Hi Fi ones) without line transformers, for local use (as in inside a room), check that you didn´t connect those terminals by mistake.
Again, add them one by one, and to confirmed working distribution lines.
Please post here exact brand and model, even better a link to their user/installation manual.
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