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I have an spl 1440 watt amp model st2-1440 that i cant get to turn on without 15 volts to the remote wire and then it gets really hot really fast. Any ideas why or how to fix it?

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Generally a battery puts out 14.1 volts to the amplifier. The only way your amp would get really hot really fast is if the amp was configured to run at to low of an ohm load.

That amps spec is to run at 2 ohm stereo. But I do see an option to get 1400 watts with 2 ohm mono, but that would require 2 dual 2 ohm subs using only one voice coil bridged to the amp. If you run both subs with both voice coils in parallel you'll get a 1 ohm load and that will overheat your amp.

Reference: http://www.sweetwater.com/forums/archive/index.php/t-2193.html


Ohms are the units that impedance is measured with. You can kind of think of impedance as the measure of how hard the amp has to push to get current to flow. The lower the impedance, the more power will be output from your amp. Unfortunately, the amplifier circuit wants to push against something, so that if the impedance is too low, the amp can perform badly, and even overheat and burn out.

Hope this helps!

Posted on Aug 01, 2010

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Volts x amps= watts.
20 amp breaker x 125 volts = 2500 watts.
However, electrician use the 80% rule, so multiply 2500 x 80% = 2000 watts.
So if you have 20 amp breaker, and 12 gauge wire, and 20 amp switch, and distance is less than 150 feet, then watt load is 2000 watts or 400 5-watt bulbs.
Keep in mind that most switches are 15 amp, and not 20 amp.
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1 Answer

How many 100 watt light bulbs can I hook to a 20 amp breaker (120 volts)


A 20 Amp breaker will support 2400 Watts with a 120 Volt line.

120 Volts times 20 Amps (Amperes) = 2400 Watts.

Answer? 24 100Watt light bulbs.

HOWEVER, you should always allow 1 cushion of 100 Watts.
That would be 23 100Watt light bulbs.

(Wait until you add electric motors to the equation. Things start getting a little more complicated)

(I always use 20 amp breakers for lighting. 15 amp breakers for lighting is phased out.

Secondly a 20 amp breaker requires using 12-2 or 12-3 wiring. (12/2, 12/3)
SO does the receptacles.
Therefore 12 gauge wiring is used throughout the house, until you come to the heavier loads )

[ 12/2 = 2 insulated conductors, and one bare copper ground wire.
12/3 = 3 insulated conductors, and one bare copper ground wire.

Remember, with 12/2 the Black wire is ALWAYS the Hot wire. White is Common (Neutral). Bare copper is Ground wire.

12/3 has 3 conducting wires.
One Black, one Red, and one White for the Common. (Neutral) Bare copper is Ground.
Used for 3-way switches ]

For additional questions please post in a Comment.

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1 Answer

Why cant i get it to power on?


have power? continuity tester available at stereo shop and retail stores. one end goes on your power wire, the other on a good ground.
have a good ground? i found under the big bolt that hold the seat belt in place works good in most cars/trucks.
make sure your remote wire is turned on.
check fuses in the amp.

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I just installed a 1000 W 3-way toggle dimmer for a load of 12 75 W recessed lights, each holding 65W bulbs. When I turn the lights on, the metal plate around the dimmer gets very hot. Is this normal?


The watt rating is absolutely critical to the operation of the device.
The high heat is a direct result of too much amperage flowing through the dimmer.

Reduce your wattage immediately or stop using the dimmer.
You have a fire hazard.

According to the math, you have 20 - 65 Watt bulbs
Change 12 of the bulbs to 40 watt and you will drop to the 1000W max.
12 x 40 = 480W
8 x 65 = 520W
Total = 1000

However I am worried about this circuit.
A typical 15 amp switch (not a dimmer, but the switch) is maxxed-out at 1440 Watts.
So if you had 20 100 watt bulbs for 2000 Watts, it would heat up the 15 amp switch
It seems very odd that an electrician would put 20 lights on one circuit without having a 20 amp switch and 12 gauge wire.
Look at the markings on the switch you replaced and look for amps or watts.
And then look at the color of the wire cable inside your box ... 12 gauge wire is yellow and the lighter-weight 14 gauge wire is white.
If you have a white wire going to all those lights, then you are going to burn down the house unless the total wattage is reduced.
Volts X Amps = Watts.

I think your circuit needs a review to make sure it has the correct wire.
http://waterheatertimer.org/Color-codewire2.html

This being said, Lutron makes 1800 Watt dimmers.
You can web search: 1800Watt single pole dimmer
If you have yellow-colored 12 gauge wire, it can carry up to 1920 Watts

If you want more help, add a comment and I will answer

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You might benefit by running bigger wire to the saw. And adding some oil in the oil caps.
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