audio-talk

Is this for me Paul?
I am a layman and don’t understand, but I’m learning. How will citric acid help? There’s always something else to know

Brian

I like the concept, but I'm not sure what the end purpose is? Kind of weird camping in the airing cupboard with a torch to see how much water folk are using... :?:


But it’s nice and warm in there :D

I want to know if the theory is good before committing to a linear pot, brackets, Arduino WiFi ...

We have an unvented (mains pressure) hot water tank was wondering how much hot water is left, and how to measure it. Some people make holes in the outer steel jacket, cut through the insulation and put temperature probes in touching the cylinder itself - six to eight spaced up the height

I thought ...

Nick wrote: Mon Jul 01, 2024 11:09 pm Yep the drawn line is the unrealistic best case resistive line. The reality is worst.

It always amazes me that valve amplifiers can sound so good despite these things

Thanks Nick, yes I get that, but don’t really have a feel for how bad or worse it would be. I don’t understand the load lines too - they look resistive, and a speaker is anything but, and I don’t have a feel for what effect that would have either

Just watching and learning

I initially tried the Purify method to get rid of the 6kHz spike, but couldn’t get the tuning right. Might have another go one day

Regarding baffle step, my speakers are about 20cm from the back wall, so I think that helps

Changed to using a PEQ to deal with the peak and made the high pass more gradual:

2024-06-15 Tried a 50Hz notch instead high pass.png

2024-06-15 Tried a 50Hz notch instead.png

Much better control and now as the bass goes lower, it fades rather than just disappearing. 30Hz may be a bit low ...

A bit of an update

Was relying on the high pass filter on the amp to tame the 50Hz peak in my room response, but always found it tricky to set and the response was never ideal. These were the settings (on separate pages, so you have to imagine a bit):

2024-05-27 Pretty happy with this one high ...

Thanks Paul, that makes sense. I imagined it would be something like that - useable within limits, but not ideal

Brian

Sorry Paul, I meant using 4 ohm speakers on the 8 ohm output tap, but don’t turn them up too loud

Stupid question alert

With a solid state amp, I would just use them, but not too loud. Is this not an option here?

As you were
Brian

Speaking of turntables, just found out that there are smartphone apps for measuring speed, wow and flutter by putting the phone on the platter. No idea how good they are, so YMMV, but might be interesting to try

Brian

Looking at your drawing, it doesn’t look like there’ll be a valley. The edges of mine were radiused so I taped sandpaper to the floor and rubbed the bowl on it until there was a flat that I could glue to. This also ensured that the edges were flat

I kept the valley as a “feature” - they’re mine and ...

I should have measured mine before I built them, but mine are about 200mm diameter
The four are pretty close, probably within a mm of each other. I put the biggest at the front so the step isn’t visible

Brian

I didn’t know about those. Thanks Jack