When i turn my rockola 459 on the speaker overload light comes on on the amplifier, but it seems to work well.

Yes, if you can find somewhere to connect a Bluetooth Transmitter.

https://www.google.com/search?q=Bluetooth+transmitter+to+a+model+70032a+rockola+amp

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If the receiver works at low volume, but goes into OVERLOAD and shuts down at higher volume, it means you are player the unit too long and too loud. Try yo keep the volume down to a reasonable volume.

Sometimes a motor is too slow because it's dirty and more current is needed to turn it, so everything ramps up and overloads.

might be a shorted speaker wire or speaker ..unplug speakers and try again

This would seem to be a problem with your usage rather than your equipment, it would be advisable to turn the volume down to see if this will cause the problem to disappear. When an amplifier goes into overload , the common reset is to turn off the speakers. There could be a problem with one or all of the following, speakers or amplifier.

Hello
It is an overload indication. Check the wiring of the speakers. If speakers of very low impedence have connected to this amp, they will overload the amp, and its protection circuit will work. Anyway, the output impedence of the amp is now very low than specified. OK.

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as a root cause for ntermittent shutdown.

http://nadelectronics.com/products/hifi-amplifiers/C-326BEE-Stereo-Integrated-Amplifier

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try connecting only 1 speaker at a time. try it on each of the binding posts (connection terminals), crank it up to locate which one of the speaker terminals is overloading the amplifier.

Then connect a different speaker to that terminal to see if it still overloads. This should determine if its the speaker that is overloading that particular terminal or if something is wrong with the amplifier.

Just for fun make sure that the cables you are using don't have any fraying and that none of the speaker binding posts have any loose strands of wire possibly grounding out to the chassis of the receiver.

Either a bad connection somewhere, or one channel in your amplifier is out.

Before you try anything else, switch the amp from 'stereo' to 'mono.' If the speakers come on, your amp is good and you simply have a bad connection somewhere between the amplifier and cartridge (thing that holds the stylus"needle"). Or, possible, but not probable, a bad cartridge.
For a quick fix, switch the amplifier to "mono" and then run all the speakers to the working channel.
In the meantime, if you're handy, try switching the speaker leads and such and see if you can isolate the problem.
Kyle~

your speaker is fried, that is the problem.