Hello everyone, this is my first post, which sadly will have to be about my overheating RB-985 MkII amplifier. Let me detail this:
I bought this amplifier used on eBay last December. I had been using it perfectly with generic car speakers without crossover, just connected with bare wire, then for about a week with a pair of borrowed Yamaha NS-10M studios, then back to the car speakers. Just recently I obtained a pair of Pioneer CS-G9900, the first "real" speakers to use on my system... as you can see I definitely not have the money for better speakers but these worked and sounded quite nice. A few days later problems began. But when was that? Probably the day the amp was accidentally left on all night (pre and everything else turned off), maybe the night before that when the power went out while the system was on then went back about 30 seconds later. What happens exactly? When played with about 50% volume, for about 15 minutes, the amp will be extremely hot from the left side, before the protection kicks in and turns off the left channel. This never happened before, and I have cranked the volume higher and played the system for hours. The time this happened, I turned everything off immediately, so I don't know if it would have eventually turned off the right channel too. I tested for possible solutions the following days but the amp continued getting way too hot from the left side. I've turned off the amp before the protection circuit could kick in, but it definitely could if I left it enough time, taking in count that the problem is still there, because I used to get an even heating from both sides before.
This is what I have tested:
1. Wiring on the speakers (CS-G9900) themselves
2. Wiring from the speakers towards the amp
3. Speaker impedance (got a stable 7.4 ohms on each one, measuring directly from the speaker terminals)
4. Switching left and right speakers (the left side still gets warmer)
5. Turning on the amp with nothing plugged in (the left side keeps getting warmer)
Is it the speakers? They didn't give any problem the days before, switching them channels doesn't make any difference, even running the amp with nothing but the AC power plugged in causes uneven warming... but I did found the super-tweeter on both speakers is dead and only gives out noise.
Is it some other component on my setup? Again, the amp heats unevenly with nothing plugged in.
So I think it is the amp itself. But what could it be? This is where I come to you looking for help. Thanks in advance.
I bought this amplifier used on eBay last December. I had been using it perfectly with generic car speakers without crossover, just connected with bare wire, then for about a week with a pair of borrowed Yamaha NS-10M studios, then back to the car speakers. Just recently I obtained a pair of Pioneer CS-G9900, the first "real" speakers to use on my system... as you can see I definitely not have the money for better speakers but these worked and sounded quite nice. A few days later problems began. But when was that? Probably the day the amp was accidentally left on all night (pre and everything else turned off), maybe the night before that when the power went out while the system was on then went back about 30 seconds later. What happens exactly? When played with about 50% volume, for about 15 minutes, the amp will be extremely hot from the left side, before the protection kicks in and turns off the left channel. This never happened before, and I have cranked the volume higher and played the system for hours. The time this happened, I turned everything off immediately, so I don't know if it would have eventually turned off the right channel too. I tested for possible solutions the following days but the amp continued getting way too hot from the left side. I've turned off the amp before the protection circuit could kick in, but it definitely could if I left it enough time, taking in count that the problem is still there, because I used to get an even heating from both sides before.
This is what I have tested:
1. Wiring on the speakers (CS-G9900) themselves
2. Wiring from the speakers towards the amp
3. Speaker impedance (got a stable 7.4 ohms on each one, measuring directly from the speaker terminals)
4. Switching left and right speakers (the left side still gets warmer)
5. Turning on the amp with nothing plugged in (the left side keeps getting warmer)
Is it the speakers? They didn't give any problem the days before, switching them channels doesn't make any difference, even running the amp with nothing but the AC power plugged in causes uneven warming... but I did found the super-tweeter on both speakers is dead and only gives out noise.
Is it some other component on my setup? Again, the amp heats unevenly with nothing plugged in.
So I think it is the amp itself. But what could it be? This is where I come to you looking for help. Thanks in advance.
Comment