Thought I better do some thorough volume calculations for the mid bass sphere as that is very important for bass response. For a sealed box there is some leeway unlike ported. Through experimenting I found the ideal volume for two of the doped 5.25 inchers to be 13 Litres minus the volume of driver ...

It occurred to me the other day that when using spherical enclosures it is very easy to change the angle that the drivers are firing, it doesn't have to be exactly perpendicular with the floor. It would be interesting to try the up and down firing mid bass turned slightly towards the listening posit...

Cast iron point & squirt speakers with some sexy rounded cabinets https://i.imgur.com/6S33hoX.jpg I see they have set the tweeter back to time align it with the mid bass . If I was doing a point & squirt then I would copy this but probably a 3 way with a bigger woofer at the bottom. Or use a...

So it seems the fact that I mentioned acrylic to my wife, sister and BIL means that really I have made my mind up about materials. This is going to be my final, end game pair of speakers so why not treat myself to acrylic spheres :dance: My kids like them because it looks a bit like BB8 from star wa...

On the subject of getting something finished, I got approval from the boss yesterday for my speaker design :dance: Showed her this after she had a glass of wine and my sister was here https://i.imgur.com/jt7peOs.jpg Told her it was going to be a mix of acrylic and wood. "Will it be easy to dust...

Good question. I guess taking an interest in what is happening with NVA and interacting with people to are prepared to listen to music and talk about what Hell Stu, there is no way i'd take offense at anything you try or have tried. I encourage you to experiment as much as you can in the time you c...

I haven't bought a stepped attenuator yet, been too busy faffing about with speakers and power amps :grin: As to introducing a buffer is concerned- I would only do it as a last resort . Adding components goes against my less is more philosophy (which I borrowed from RD). If I ever did use one it wou...

Some of the tests performed on amplifiers are just bizarre, like 19kHz + 20kHz and look for IM products. I don't know about you guys, but i can't hear either of those and you won't find anything like that in music, so what is the point? This is just amplifier torture. By IM do you mean inter modula...

Gosh what a long thread. It's going to take a while it catch up, but in the meantime... Objects much smaller than the wavelength are ignored by a propagating wave, immovable objects much larger than the wavelength cause a simple reflection. It's where the object size is similar to the wavelength th...

I am currently weighing the options up and one of the things I have to consider is cost. The cost of the acrylic globes (clear and opal, 3mm wall thickness) was one I could live with, just. The cost of black 6mm thick hemispheres which need to be acrylic welded together is getting pricey (£240 + vat...