Hello, I have two Beyer DT770 drivers, each from a different pair, I put them together and noticed the volume from both sides was different, so I measured it and one of them shows 234 ohms, the other 250. Can I do anything to match the impedances or I'm just going to have to adjust the volume...

Well I appreciate your responses anyway, at least I fixed the resistors :thumbsup:. Maybe I'll try to find a higher rated psu, I think the_equalizer had a 1A cisco psu.

I connected R3 and R9 directly to the pins but it didn't make a difference unfortunately, power supply still turned off after around 2 hours. I tested the current and it was drawing 0.28A. (This PSU is rated at 0.38A).

Interesting, can I test the current with the multimeter? At what point would be best? The mosfets are connected with cables to the pcb, maybe I should connect them directly to the pcb.

Does anyone have any idea why the Cisco power supply enters protection mode after 1-2 hours? It just started happening all of the sudden, I have to disconnect the power supply and wait a minute. The amp works fine, it just turns off all of the sudden, I also notice the power supply is quite hot...

That's what it said. I contacted the seller for a more detailed description.   My guess is they messed up and it's actually the RE-400i. 

I just bought a used pair for around 67$ + shipping on amazon.co.uk from a very reputable seller, it said it comes with earphones only + extra earbuds.   I don't have high expectations but I had to try. As long as they actually work I supposed I'll be happy, I can always buy or use replacement...

Have you tried with the onboard audio? Some onboard chips nowadays are more than decent.

Yes I'd rather not buy them there, plus they are double the price.

Such a shame that there's still no way of getting these in Europe. And can't even find a place to import with a fair price either. 

Well I've re-build the amp with the new pcb into a small cardbox until I can make or find a decent enclosure. It finally sounds alright! I knew there was something wrong with my p2p build, it sounded very harsh, now it's totally different. I'm really glad I bought the PCB, thanks again Fred.  ...

Hey muskyhuntr, what do you use for the words on the case? It looks neat. Also do you use a led for the power and if so where does it go in the pcb?   Quote:   Not at all, it's just I prefer the 2D puzzle myself at least for now, maybe because it's easier. Also feels more sturdy with a...

It feels so good soldering in one of these...Doing a p2p build the first time was a good learning experience but I'm never doing that again.

Yeah I got mine today as well. Time to work.

Just as a curiosity, you can usually find up to 6 mosfets with screws, washers and insulation pad inside computer power supplies. If someone has a dead power supply it can be a good way to recycle some parts. Just be very careful if you're gonna poke inside a power supply, be sure to fully...