Amplifier cutting out |
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Alec_Hood
Registered User Joined: 28 June 2013 Status: Offline Points: 16 |
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Posted: 28 July 2013 at 10:32am |
Turns out it was because I was trying to wire two speakers through the same terminal, it was just cutting out because they terminal was short circuiting.
I bought another terminal and chucked it on the box, works perfect now |
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GEB
Old Croc Joined: 13 November 2009 Location: East Midlands Status: Offline Points: 1993 |
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Double check all your speaker wires and power cables. Sounds like its shorting itself out and going into protect for some reason. Have you tried it on a different speaker set to rule out wiring problems?
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infrasound
Old Croc Joined: 13 May 2011 Location: Brizzle Status: Offline Points: 2276 |
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Get a multimeter.
1. Disconnect the output loudspeakers from the amplifier, and measure the resistance (Stick on 10R on the multi). Report back. 2. Put the multimeter across the input power terminals, and watch the voltage as you force it to 'cut out'. Report the lowest number that you see on screen. |
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Alec_Hood
Registered User Joined: 28 June 2013 Status: Offline Points: 16 |
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None of the speakers or sub is wired parallel.
The Amp manual suggests I use 4 Ohm speakers, and a 4 Ohm Sub Bridge the Sub so I have double power |
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Alec_Hood
Registered User Joined: 28 June 2013 Status: Offline Points: 16 |
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That makes a bit of sense!
But how do I fix it? haha |
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APW
Young Croc Joined: 13 November 2012 Location: Kent, UK Status: Offline Points: 1174 |
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If the speaker and sub are both 4ohms and wired in parallel your amp would see a load of 2 ohms!! This would cause it go into protection mode. |
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Alec_Hood
Registered User Joined: 28 June 2013 Status: Offline Points: 16 |
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No I haven't tried that, But what would be causing it to short circuit?
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Alec_Hood
Registered User Joined: 28 June 2013 Status: Offline Points: 16 |
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The sound is perfect up to when it cuts out, The amp is 4 Ohms Independence , so is the speakers and Sub..
I am pretty sure it is going no where near as loud as it is meant to. |
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infrasound
Old Croc Joined: 13 May 2011 Location: Brizzle Status: Offline Points: 2276 |
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Sounds like there is an output impedance problem (short circuit / too low impedance) - triggering some protection.
Alternatively, low Vin to the amplifier. Have you tried metering the supply as it cuts out?
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studio45
Old Croc Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3864 |
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Check for a short circuit in the speaker wiring. Is the sound OK up to the cutoff point or is it distorted at all? 800 watts isn't that big for a car amp, and is probably the 2 ohm rating. If you have 8 ohm speakers it will only put out 200 watts into them. Perhaps it just isn't as loud as you are expecting?
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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Alec_Hood
Registered User Joined: 28 June 2013 Status: Offline Points: 16 |
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I thought that too, but it will do it even when I just turn it on?
Like, it's not hot at all |
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mini-mad
Old Croc Joined: 13 July 2012 Location: london Status: Offline Points: 6903 |
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it must have a cheap limiter circuit in it... and iv had a few that got real hot real fast and thermal'd, then once the temp dropped came back on.
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If it sounds like a gorilla is trying to escape, turn it down.
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