it's a Christmas miracle... in April!
The winter 2007-2008 I bought a not very expensive integrated amplifier to use with my computer. I have other amplifiers but I wanted something that could sit under the 16:10 Samsung LCD i used back then. I bought this amp mostly because it was cheap but also because it got great reviews. The Swedish audio magazines wrote that it was the best cheap Chinese amp they had tested.
I was happy with my amp, it could power my QLN Signature MKII (also Chinese made) I use with my computer without issues. The amp has a switch to configure it for 4 or 8 ohm impedance speakers to limit the current with 4 ohm speakers to hinder the amp from killing it self. My speakers has an impedance of 3-4 ohm but I always had the switch set to 8 ohm as current limitations are for chickens. 😈
One very hot summer day about half a year after I had bought the amp it just died. It diddnt go out with a bang, the sound just dissapered with a "click" without the unit even powering off so it was more like some protection circuit decided that something had gotten to hot. I was not very surprised as my LCD screen on top of the amp blocked the air vents and I had played loud and for an extended period of time in 30+ degrees C heat. What did surprise me a bit was that the amp would not work again once it cooled off, or the preamp circuit seemed to work but not the power amp.
The next day when the amp still diddn't work I disassembled it and poked around with my multi meter, the MOSFETs seemed ok (as in not shorted) but the signal got lost somewhere. I had other things to do so I packed away the amp and thought I could at least use it as preamp as it has PRE OUT jacks. The unit was still under warrenty but I was too lazy to send it back.
Now almost 8 years later I was clearing out the storage where I put the amplifier and thought that I should look into the issue a bit more thoroughly. I removed the hood, connected speakers and poked around with my MM, now the signal diddn't disappear like magic somewhere, there were current flowing through the MOSFETs and the speakers did output some static as I tested the unit using the radio without an antenna. I connected a CD player and the amplifier indeed works just fine!
It must have been a protection circuit that had activated like I first thought, it just needed alot of time to reset it self (probably not the full 8 years though).
The perhaps not 100% accurate specs.
Weight: 6,4 kg
Size (H x W x D): 100 x 434 x 325 mm
Max Power Output: 2 x 216 W (4 ohm), 2 x 116 W (8 ohm)
RMS Power Output (THD<0.1) : 2 x 200 W (4 ohm), 2 x 100 W (8 ohm)
Signal to Noise (A weight): 101 dB
Frequency Response: 20 - 20.000 Hz (-0.1 dB)
The "Proson RV4200 v.2", You know something is really high end when "HIGH-END" is written on the item in question! 😁
Proson RV-4200 v.2.JPG
Proson RV-4200 v.2 backside.JPG
Specs like these, RMS Power Output (THD<0.1) : 2 x 200 W (4 ohm), 2 x 100 W (8 ohm) with a coin sized transformer FTW! 🤣
Proson RV-4200 v.2 inside.JPG
If that coin sized transformer can deliver enough juice the specs seem more or less correct but thats a big IF.
2SA1494 + 2SC3858.jpg
New PC: i9 12900K @5GHz all cores @1.2v. MSI PRO Z690-A. 32GB DDR4 3600 CL14. 3070Ti.
Old PC: Dual Xeon X5690@4.6GHz, EVGA SR-2, 48GB DDR3R@2000MHz, Intel X25-M. GTX 980ti.
Older PC: K6-3+ 400@600MHz, PC-Chips M577, 256MB SDRAM, AWE64, Voodoo Banshee.