rockfordfosgate power T1000-4 problem, little power

[boot35]

Good morning gentlemen, I have a problem with this amplifier power t1000-4 class a / b, everything works, however, it does not develop all its power (approx 50%), its capacitors are from 3300 mf to 63 volts, but the source only delivery + - 41 volts, positive from the tester to diodes (central leg), negative tester to RCA shield, I suppose the source must develop more voltage, will have to modify resistances of tl494?

Excuse me, I am using a translator.

An externally hosted image should be here but it was not working when we last tested it.

 

[Perry Babin]

Did you connect a load and drive it to clipping to see if it was producing rated power?

 

[boot35]

thanks Perry; each channel is used at a load of 2 ohms; its current power has been compared with a t400-4, the power is quite mediocre even at 2 ohms. Do you know what should be the normal voltage of the + -?

 

[Perry Babin]

I think it's enough. Is the voltage sagging significantly under load?

Are you sure that no speakers are out of phase?

Are you sure that you're driving it to full power (threshold of clipping)?

 

[boot35]

this amplifier I bought it used 4 years ago and we have used it three people and we have all agreed that it generates little power (I am talking about installers of years).


No speaker is out of phase, it has been tested in various cars and configurations.

it has worked up to 8 volts pre out of signal output and its power is still limited.

there is no voltage drop at the source when it is connected to the speakers.

 

[boot35]

curious fact: regulators
lm337 -27 volts
lm317 +15.40 volts

measured with tip + tester to sentral leg and tester ground to RCA shield

Are these values ​​normal?

 

[Perry Babin]

leg 3 on 337

 

[boot35]

Leg 3 lm337= 14.75 volts

 

[Perry Babin]

Are you sure that you're driving it to full power (threshold of clipping)?

 

[boot35]

if perry, however doing other tests I have noticed that the apparent lack of power is only seen when the amplifier is in HP (high pass), because in LP (low pass) the amplifier performs well, can there be any obvious reason?

 

[boot35]

I guess there is not much to do in this device, I appreciate your attention Perry.

 

[ph15]

Any capacitor that is leaking, could be dragging down the power supply voltage and limiting your power output accordingly. This is easy to test if you have a capacitor tester or you could just shot gun the whole system and replace all of the caps and of course be sure to observe polarity. When I say leaking I mean a breakdown inside the cap di electric insulation. If the output is the same on both channels then the power supply caps would be the first one's to replace and then re-test.

 

[Perry Babin]

Do NOT replace any capacitors. The amp is likely in perfect working order.

 

[ph15]

One final note, what is your power source for the amp, are you using a 12 volt battery or a bench power supply ? If you are using a bench power supply what is the maximum amperage that it can put out. You need at least a 10 to 15 amp power supply before any testing can be done. The supply voltage to the amp and the current available is critical. When everything in the vehicle is running the 12 volts may be sagging. With the engine running you should have around 13.8 volts or a little more feeding the amp. If it is below 12 volts there in no way you will have full power out.