Greetings and My First Decent Build

[Wolf]

Re: Greetings and My First Decent Build

Okay, here's my BSC/Room graph. What do I need to do with this? What information can I obtain from this?

[ATTACH]11359[/ATTACH]

You apply it to the graphs you used in PCD, and then double check your model. I think you have to import the curve to RM, and then apply it, and resave.
Later,
Wolf

[greywarden]

Re: Greetings and My First Decent Build

Cool Thanks, I'll work on that, wife had to buy fabric for Halloween Costumes, so the wood will have to wait till next paycheck!

[henrikhegh]

Re: Greetings and My First Decent Build

Hi.

The acoustic center a located somewhere around where the coils is connected to the cone. But with a simple mls meassurement, its very easy to find precisly.

You meassure the tweeter, the bass and the both of them i parallel. Then you import the meassurements into eg lspcad. Then you increase the delay in the simulation untill the simulated frequencyresponse matches the meassured one. Then you have your delay, very precise.

The greater the distance to the speaker, when meassuring delay, the better. And the mic has to be between the units (not tweeter height)

(No, spelling is not my middle name, nor in Danish og English)

[greywarden]

Re: Greetings and My First Decent Build

Haha, that's fine. I'm not going to time align this one, or at least this cabinet.

I do, however, have an update!

I got my wood cut yesterday! It only took a half a sheet of MDF, so the other half is going towards a sewing table for my wife.

I'm also ordering some box building/assembly items:

Crossover Parts
Gold Binding Posts, Dayton Brand

[henrikhegh]

Re: Greetings and My First Decent Build

Hi,

You need to find the acoustic delay, in order to make an valid crossover.

[greywarden]

Re: Greetings and My First Decent Build

And Today I ordered

Dayton Black Aluminum Single Binding Post Plates
Black Steel Speaker Spikes

And Felt Tweeter Diffraction Rings from Madisound, but apparently they suck lol.

[greywarden]

Re: Greetings and My First Decent Build

Got that stuff in, The Aluminum Binding Post plates are pretty hefty!

I'm getting excited, I think 1 or 2 more orders before I have all my parts.

I ordered some of these to build my crossovers (power in, woofer/tweeter out). 0.1uF Dayton Precision Audio Caps, and some Hurricane Nuts.

Then from M*d*s**nd :D I ordered some wool stuffing.

And from HomeGrownAudio I ordered a 1ft piece of 18ga silver wire for the center bar of my crossovers.

Let the flaming begin :rolleyes:

[greywarden]

Re: Greetings and My First Decent Build

Alright, I got all that stuff in, except the wire, but the weather has been awful here lately. Chinook. Sucks with you've got 6" of solid ice on the road melting because the temps are teetering on the freezing line... anyhow.

The wool is nice stuff, and dense, too may not need as much as I thought I would.

The terminals are WAYYYY bigger than I thought they would be. But they'll work out nonetheless.

I'm going to have to build some speaker stands for these badboys, they're going to be pretty big :D

I've been learning alot with PCD and it's associated calculators. So I'm redoing my PCD with both the crossover using the parts I have on hand, and a better Crossover, soon.

Thanks for all the help, guys I'm learning. I need a DMM real bad, then I could get the impedance measurements...

[greywarden]

Re: Greetings and My First Decent Build

Alright, now that I've made all of my physical measurements including a very close approximate AC measurement, I opened up PCD and input the crossover I had planned and it looked so bad I was embarrassed to even think about posting it!

Now, here's a picture of what I got after moving around the parts that I have on-hand as I really don't want to order any more parts as of now.

I'm currently formulating a new plan...

[Wolf]

Re: Greetings and My First Decent Build

Alright, now that I've made all of my physical measurements including a very close approximate AC measurement, I opened up PCD and input the crossover I had planned and it looked so bad I was embarrassed to even think about posting it!

Now, here's a picture of what I got after moving around the parts that I have on-hand as I really don't want to order any more parts as of now.

I'm currently formulating a new plan...

[ATTACH]12325[/ATTACH]

[ATTACH]12326[/ATTACH]

FWIW- I don't really like that model at all. Your woofer peaks at the xover, and you have not enough protection on the tweeter. You should have a cap in series with it, IMO. The 0.1uF cap where you now have it will not do much of anything.
Later,
Wolf

[greywarden]

Re: Greetings and My First Decent Build

Yeah so it's a total fail lol. :rolleyes:

Yeah I tried for about an hour changing stuff around and everyhting else was a disaster. I''ve worked out a much, much better parallel X-over that's within 2dB from 100Hz on. Now I'm of frackin with PCD and I just closed it. So I'll get on it tomorrow I guess.