Recent content by dumptruck

I dunno, but it should probably be a half-speed-mastered 45 rpm 12" single.

The varying "hotness" Ken already described; when you look at the groove spacing, closer grooves on a less-loud LP means more music crammed on it (not good for sound, generally), and/or less bass. However, there is another reason to be less-loud that doesn't allow for such close groove...

I've got some rock hard speaker baffles that beg to differ. It can take several weeks to cure, though, which sucks. This project doesn't look like it needs more advice, except I'll say that I don't personally think the difficulty of using rattle cans for anything glossier than satin is...

Probably. To answer the question I didn't answer back on 1/6 above, that's not a frame around the bracing, it's the frame that the removable panel is bolted to, attached to the sides.

Plasma drivers have been around a long time, they just tend to be dangerous or require a supply of gas or extreme voltage or... basically it's just always something no matter which way you go about it. There are current and past retail speakers using them. Google "plasma tweeter", "singing...

There is an endless variety of foam. Gedlee speakers use some type of 30ppi open cell foam filling the very large HF waveguide, which causes only slight attenuation. It doesn't get much more "breathable" than that, but it also doesn't get much less effective for absorbing midrange as you would...

If you're not playing both guitars at the same time, then you just need an A/B box used backward, like this one: http://www.instructables.com/id/How-to-make-a-AB-box/

The guitars are going to have higher output impedance than the input to the combiner network; I think you're going to have all sorts of weird effects doing this passively. Make an A/B switch box if you don't use both at once. If you do use both at once, buy or make a pedal-format 2in/1out...

Acoustic and electrical measurements? Otherwise, trial and error. Bass reflex designs should never be filled with anything, but you can add absorbers.

There's nothing especially special about this, but it meets your requirements: https://www.boxedkitamps.com/gobo-stereo-audio-amp-kit (oh wait, except the monoblock part... I guess you could buy two and only put one amp board in each one ;) Don't expect DIY amps to be any sort of bargain when...

Let's get more specific. What are you trying to do? Convert a 20 to a 17? For what reason? The amp you want to use doesn't like 4Ω, or do you have one of each? Kirk's response is 100% correct if the amp is the problem; just get another of the 8Ω woofer and put that in. Resistors will make a...

It's 10dB down at 40Hz because that's anechoic. The low resolution red graph in the middle (approx. flat to 30Hz) is a treated listening room measurement. The HF attenuator range is shown as the cluster of HF lines at the top of the last graph above. On-axis is just a little on the bright...

WinISD pro has one, but I've never used it to actually build something where I could measure and confirm the result.

They don't sound a little hissy? Sure looks like they could do with a bit less 3-8kHz in these measurements:

Xover to tweeter is way too high for the dual mid arrangement, and probably a bit high for getting smooth horizontal polars too. Replacing the tweeter would be the most economical way to deal with that. If somebody wants to drop one at my house for a while, I'd be happy to do it, but not...