PQM 13 is louder at 1300w than UKP2100x at 2100w?!

Oh my god... Is there no end to it 😂
I've not had any speaker issues in over a year doing it that way, so it must roughly cut the output in half! I'll do some reading

charlysays wrote: No worries, I've got a lot more to learn there...totally crap at maths in particular. I've got brick wall limiters in place to limit signal to 0.775v... Turning the gain pots to half makes the amp half as sensitive. So provided the limiters maintain a brick wall, the amp should be half as powerful with the pots at half way surely. Because in that setup it'd need 1.5v to clip.

get red or green nl4s so you'll always know which end of your bridged cables are for the amp. and don't ever use that colour speakon for anything else.

I'm glad to hear that too nicky! Ukp2100x seems to be a cracking lightweight amp considering they can be had for less than 200 in good order.

I've ordered two red nl4 now. Been reading about the db scale, linear vs logarithmic and how it's really a ratio against a given reference. I'm still finding it confusing and it'll be a while before I do any of the formula on paper, but I can see how it'd be even worse if we just used linear scales.

With regard to preventing excessive clean power blowing a speaker and how to limit that I can see why using a gain control on the amp is not precise at all.

Would I be right in thinking that to reduce the output I should leave the limiter setting as it is (0.775v) but subtract db on the output band on the ultradrive?
So to halve the volume I'd have that LMS output gain at -6, the limiter at -22 and then I can run the amp gain flat out but not exceed 50% of the power available from the amp?

I got one for 220, the other for 180, both pretty much mint and only needing a quick clean internally ☺
You don't see them for sale much, I guess people hold onto them and I suppose if one went bang Robin would repair it reasonably.

good stuff.

yeah running amps fully open and using lms to control gain is the done thing. you can password lock your lms which will stop any random person turning things up more than you want.