ptptaylor

Hi, I brought a TC Electronics BQ500 on this forum a couple of years ago. It has been absolutely great until last week when it decided to malfunction. Even when I don't plug in any input or speaker, the system seems to go into heat protection mode, and there is no output, while the fan goes on high and the peak signal light turns red. It takes about a.minite to get to that point, and works normally for about a minute with output etc. I've opened it up to take a look but would love any advice if anyone has seen this before. I can't see any obvious signs of damage or blown circuitry. I'm assuming it's a faulty thermostat or something based on the symptoms.

I purchased a TC Electronics BQ500 bass head from Gerry and he's been the best introduction to this forum I could ask for. The amp was exactly as described, posted quickly and very safely. If the opportunity came about again I wouldn't think twice about trading with him again. Thank you Gerry!

I'm new to this forum, and I wish I had found it sooner as it seems great (and it would have helped me make a few less mistakes in my journey)! I'm an acoustic engineer by trade (note not sound engineer) and thought it therefore necessary to delve into creating a cab at some point. So I started with a 12" sub driver I've had for a long time which is housed in a car sub enclosure. Packs quite the punch at low frequencies as it's meant to sit in your car boot...but severely lacks at mid/high frequencies (cut off is probably around 400 Hz or something). I tried it for a little while and even took it to the practice studio, and it could hold it's own but it lacked any sort of clarity. I therefore decided to bolt an extra driver on top to help lighten it up. Standard ply box very crudely cut to size, with all the mistakes hidden by a nice piece of felt to finish. I added an 8" driver, stuck a crossover network in and hey presto - I ended up with something which covers a lot more of the spectrum now. Thankfully I want to uni with someone who works in loudspeaker design and they were happy to help design the crossover network. The second picture is me trying to measure the frequency response - worth noting that I don't own a mic stand or a mic of any quality hence the rather strange measurement setup. All in it's probably taken me 3 months to do it although it's felt a lot longer! As I'm not in anyway a pro musician I couldn't justify big spends - I think the top cab cost just over £100 inc the driver, ply and crossover parts.