Deadhorse Build Thread

[donradick]

Re: Deadhorse Build Thread

I've found that if you get tangled up with a sim, first, make a CSP file with only the vital info (x,y,z measurements, effective diameters, etc) then stop and close it. Then pick it up a day or 2 later and start over.

I ususally start super simple, and work my way up very methodically. This one I had to [attempt to] flatten out both drivers' impedances, then FR, and once that was done, implementing textbook crossovers pretty much nets you what you're looking for. That said, there's 17 essential parts to this crossover :eek: I was actually able to knock 2 off the tweeter.

That's pretty much the way I do it. Sometimes leave it, and come back a few days later and try something totally different. For instance, I've got an MTM design with a very nice reverse null (LR2 / B3 electrical), but I'm going to try a resim with a B3/B3 for off axis smoothness. I'll usually try with/without a zobel - so far haven't needed one.

[greywarden]

Re: Deadhorse Build Thread

Alright, I got the majority of the of the pieces in the mail today, save 1 inductor and 2 caps, all on backorder :(

I'm going to buy a digital micrometer so I can measure the parts and use Emachineshop to develope a good layout!

I'll try to hook them up with some parts I have on hand that can be subbed in and get some measurements

[greywarden]

Re: Deadhorse Build Thread

Alright, I got the majority of the of the pieces in the mail today, save 1 inductor and 2 caps, all on backorder :(

I'm going to buy a digital micrometer so I can measure the parts and use Emachineshop to develope a good layout!

I'll try to hook them up with some parts I have on hand that can be subbed in and get some measurements

Ok, that crossover, for some reason, was absolute garbage, and I don't even want to talk about it. I honestly don't know what happened.

BUT, I've spent almost the past 2 weeks working on a better, the best yet, crossover. Here's the response, notice the 1dB scale ;)

[killa]

Re: Deadhorse Build Thread

I am betting there are less components in this xo? Looking good. How does it sound?

[greywarden]

Re: Deadhorse Build Thread

I am betting there are less components in this xo? Looking good. How does it sound?

........21?

It doesn't sound just yet, I need to order more parts :o

[killa]

Re: Deadhorse Build Thread

........21?

It doesn't sound just yet, I need to order more parts :o

:eek: My 3ways only have 20 parts. I take it you are still trying to flatten the impedance? Just curious as I thought the drivers should be easy to work with.

[greywarden]

Re: Deadhorse Build Thread

Zobel, 2 notches and [electrical] 3rd order crossovers on each driver :rolleyes:

Really if I could, I'd implement another 2 notches on the tweeter's humps.

Buuuuut, I still have to order parts and measure, measure, measure. I tried pretty much every type of measurement I could, save outdoor, becuase it's still below 0*F here, and I'm just tired of being cold (going on 3 years...), but I think I finally got my measurements to work for me.

[johnnyrichards]

Re: Deadhorse Build Thread

Zobel, 2 notches and [electrical] 3rd order crossovers on each driver :rolleyes:

Really if I could, I'd implement another 2 notches on the tweeter's humps.

Buuuuut, I still have to order parts and measure, measure, measure. I tried pretty much every type of measurement I could, save outdoor, becuase it's still below 0*F here, and I'm just tired of being cold (going on 3 years...), but I think I finally got my measurements to work for me.

Huh, Arizona weather in SoDak this weekend. Sunny, dry and in the 80's. Went for two runs, made a pile of sawdust...

[50 watt head]

Re: Deadhorse Build Thread

Huh, Arizona weather in SoDak this weekend. Sunny, dry and in the 80's. Went for two runs, made a pile of sawdust...

Oh, so THAT'S what happened to our sunshine :p It's been rainy, cloudy, and cold here for the last two days.....

[greywarden]

Re: Deadhorse Build Thread

Huh, Arizona weather in SoDak this weekend. Sunny, dry and in the 80's. Went for two runs, made a pile of sawdust...

I wish I liked to run. I only run when I have a pt test haha, I need someone to make me run

[Whitneyville1]

Re: Deadhorse Build Thread

I think something is wrong. I have 3 pairs of the Vifa truncated BC25 tweeters and 1 pair of the "square" of the Vifa BC25's, and the Vifa FR graphs are a lot better than you're getting. My quick and dirty mic in Speaker Workshop reads them better too. If this isn't your tweet, then ignore me. I don't know a thing about your Peerless mid-woofer...sorry. I always think if it looks too complicated, maybe it is.

[donradick]

Re: Deadhorse Build Thread

I think something is wrong. I have 3 pairs of the Vifa truncated BC25 tweeters and 1 pair of the "square" of the Vifa BC25's, and the Vifa FR graphs are a lot better than you're getting. My quick and dirty mic in Speaker Workshop reads them better too. If this isn't your tweet, then ignore me. I don't know a thing about your Peerless mid-woofer...sorry. I always think if it looks too complicated, maybe it is.

Remember Grey posted a 1 dB sim from PCD.

Grey
I really would not worry about those little 1-2dB wiggles. If it measures that flat, you should be good to go.

[greywarden]

Re: Deadhorse Build Thread

Remember Grey posted a 1 dB sim from PCD.

Grey
I really would not worry about those little 1-2dB wiggles. If it measures that flat, you should be good to go.

I think something is wrong. I have 3 pairs of the Vifa truncated BC25 tweeters and 1 pair of the "square" of the Vifa BC25's, and the Vifa FR graphs are a lot better than you're getting. My quick and dirty mic in Speaker Workshop reads them better too. If this isn't your tweet, then ignore me. I don't know a thing about your Peerless mid-woofer...sorry. I always think if it looks too complicated, maybe it is.

Yeah this is a buyout from 2 years ago almost, now, it's a Tymphany DU0188 made to be mounted in a port on a certain "Austrian" speaker company. My original sims weren't very far off with a similar Vifa tweeter. I just had to get my measurement setup worked out.

And yes, that graph is in 1dB increments. With an FRD file and excel I determined that from 100Hz to 20kHz, it's better than +/- 1.75dB

I just hope it measures that way, too. I'm moving into an apartment next week with a guy I work with, so all my funds I've saved are being used on that, it'll be the 1st until I might be able to order parts.

[greywarden]

Re: Deadhorse Build Thread

I got some wood cut today for a pair of enclosures, hopefully I glue them together correctly.

Brought to you by Sawstop, the cool sled that the woodshop guy made, and my buddy with an F-150

:D

[greywarden]

Re: Deadhorse Build Thread

I'll get back to working on this when I get home. Shipping will be free :D