A post was merged into an existing topic: DIY Audio General - stuff you’re making, tips, advice sought, etc
My LVs are long gone, these are a loan pair. I intend to play from records, tape and computer so matters get a bit more complicated. I’ve got a miniDSP 2x4.
If I at least use what I currently have for learning I should be in a better position to know what to buy in the future. The replacement driver has jsut turned up and been bolted in, so I’ll get to work trying to smooth out the lumps in the bass response, once I’ve calibrated soundcard and SPL.
Oh ok. I think that @coco had a Young ADC that they sell as a way of digitising vinyl, but didn’t have much success with it. Sounds like active, rather than digital active, might be best for you. There are some pro active XOs that might work, and that kind of thing is pretty cheap. Should be great for experimentation.
I’ve never been that happy with extensive bass room correction; the only thing that worked for me was to measure in lots of places and reduce the peak that is in every measurement. I think it’s normally the floor-ceiling mode. Better to break it up with furnishings, I reckon!
The plan was to eventually run all sources into a pre amp of some description (current leader is a TVC that I have the transformers for) then into the MiniDSP. Currently just putting a single source through it (Raspberry Pi running Volumio).
Ultimately I’m up for trying anything, I’ve got a terrible track record for completing projects though, I started building some Valve amps in 2006 and a headphone amp about 4 years ago.
You don’t want to put the volume control ahead of the ADC. The volume control needs to be after the DAC. Which means, when running multi-channel, that’s you need multiple volume control channels synced together.
Otherwise you lose resolution and increase noise.
The minidsp has a digital volume input, any use?
Don’t know enough about the MiniDSP to comment on that. In general, you want as large a signal going into an ADC as possible (without clipping the input) to maximise 5he number of bits you use.
ok thanks, that puts a very different slant on everything.
This is where I got to before I had to stop to reopen all the doors and windows because I was dying with 2 class A amps doing their best heater act. Sounds awful.
I wouldn’t bother sweeping below 30hz.
If that’s from seating position it will sound awful as you have an upward slope.
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OK, will do a couple more starting above 30hz. I think I need to focus on the crossover before adding any EQ.
Under 30hz your are probably just stressing the amp and drivers is all.
You shouldn’t need eq as such, a speaker should be flat at 1m in an anechoic chamber. Once it’s in room you get a downward slope.
Can you take measurements of the individual drivers with the crossovers applied?
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I can, from the listening position or 1 meter?
Doesn’t matter really. I was just trying to get a sense of what each driver was up to
As they are full range units, off axis tends to be all over the place. It’s probably worth taking measurements at a fixed distance at various angles.
You might find the rising response is only on axis, which can help compensate for it dropping off off axis due to beaming.
You might find a better toe in angle.
Yeah ‘full range’. I’ll measure at 1 meter and various angles in a bit. Also I’ve chosen a crossover point based on what is probably nonsense I read on the internet. Will post with the other option I was exploring too.
Have you considered just setting fire to them?
Given the fs is 100hz I’d be crossing over at say 150-200hz.
On the main driver I’d probably just start with baffle step compensation and see what it looks like.
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I used them as a low cost intro based on a bunch of enthusiastic internet reports. They are serving well for that but I don’t think this is an end state, especially when I see stuff like this
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Maybe they could fill in between the bass unit and compression driver? 250-800Hz? Would still need something to deal with the shit from 1.3kHz though.
Your plan has merit!
I’ll set fire to them once I’ve got something else, which I’ll get once I’ve got somewhere with this setup.
Baffle step, would the baffle width be the front part or the wings added on too (191hz vs 93hz)