I have some BMS drivers and Autotech horns which will work,Would you like to borrow them? I’m not far from you at all.
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I absolutely would, thank you, very kind offer. Would be good to hear your system as well.
I should say a sincere thanks to everyone who has tried to help so far, Guy did a good thing getting me onto this forum.
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I’m off for the next couple of weeks but away this weekend, will be easy to sort out next week. You are welcome to come and listen, or I can come to you. 
I’ll come up, I’m free apart from Tuesday and Thursday.
In the interests of messing about, seeing if my mic was OK and wondering if there is something weird going on in my room I measured my bass guitar amp which is supposed to be reasonably ‘full range’.
I think it shows the mic is at least in some sort of correct ballpark and that the room doesn’t have some random rise above 1Khz. It also shows that at low volumes my bass amp doesn’t actually put out much in the way of bass 
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and sitting here listening to music through it, that severely limited top end is not an issue at all. 15db down at 10khz and nothing at 20khz. That’s interesting to me and confirms what I’d sort of though, if I have great reproduction up to 10khz it might just do.
@Wayward is your expert on high frequencies
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Now this is mildly interesting. Direct into amp from soundcard compared to via miniDSP.
The direct signal was way hotter, had to turn it down to stop it clipping, when I had the treble didn’t reduce only the bass.
Which is which?
Darker green is through miniDSP. When I get a chance I’ll equalise the measurement with pink noise before to get a more accurate idea. Obviously the volume or gain circuit on my bass amp could be the culprit. I’m not losing sleep over it.
Also not quite related but figured as I have my own thread I’ll use it.
In 2011 I started building a headphone amp, by 2016 I’d got this far
2019 It looks like this
There are not some preset options selected on your sound card through Windows, such as Rear Effect or Satellite for example?
I’m using the soundcard in both scenarios,
scenario 1 soundcard RCA out to miniDSP, RCA to 1/4 jack into amp
scenario 2 soundcard RCA to 1/4 jack into amp
In which case the MiniDSP must have a filter active as mine is flat in/out.
All looks ok, will factory reset next time and try again.
It’s 20db down on output. You don’t have the high pass set at 1500hz or something? It looks very similar to the earlier measurements.
I’m basically just getting inconsistent results for some reason.
This is blue, factory reset minidsp, red direct to amp at -10db, brown direct to amp at -31db
You haven’t got some kind of auto gain control going on in the PC? Make sure you’re using the correct driver path.
Not that I’m aware of. It’s a MAC with Focusrite interface. Fairly uncomplicated compared to a PC with ASIO stuff.
You may have some HF noise somewhere, maybe? Some earthing issue?
I am totally perplexed by your measurements tbh