Infinity IL30 Rebuild

[jwjarch]

Coming along driver test fit and assembly is good. They’re sounding great too. The Swope drivers JUST fit into the baffle space on the IL30 cabs. IMHO it’s what these speakers were meant to look like. 😁 Here’s a before and after.

[jwjarch]

Thanks Chris! I'm really looking to get this and a few other speaker projects really moving again. I've been neglecting all of my speakers for years and focusing on amplifiers, pre-amps, phono pre-amps, etc. Did some soldering on the first crossover last night. So easy to work with nice crossover boards. Glad I took the time to design and CNC them.

[Chris Roemer]

Looks cool !

[jwjarch]

​We’ll it’s been five and half years so I figured I may as well finish this build already. Haha! I’ve had all the components for about that long but now I’m adding some more fun with a CNC machine. I’m making baffles out of poplar to fit the IL30 cabinets. The piece in the video link that I held up is just for testing and fitment purposes. Last night I also CNC’d some crossover boards out of plexiglass. It’s finally coming together!

https://youtube.com/shorts/23nVzR9zt74?feature=share

[jwjarch]

Thanks Chris. The Swopes use a slotted port so I'll go with what Unibox is telling me for a round port that works with my cabs. Right now I have them tuned to 44hz with an F3 of 42, with a 3" dia. port at 9-1/4" long.

[Chris Roemer]

A 20% change in volume will most likely not matter one bit. I'd even keep the same port tube dims.

[jwjarch]

There it is! Thanks Squidspeak! I knew there must be a design for the M5n's out there somewhere. I'd been to Paul's page a bunch of times and somehow I missed it. I guess my only question now is, does the extra 0.2 ft3 change the XO design at all? Doesn't seem to matter for the response I have going in Unibox but I bet that doesn't tell the whole story. I'm sure I could take up volume if needed but I I wonder if the extra volume would benefit the bass response. Thoughts?

[Squidspeak]

You can do a lot better than the DC28F for the same money, one option ND28, that can cross as low as 2K. I don't think it is recommended to cross the M5n at 3500hz.
Checkout the Swope design by Paul C. It uses the M5 and the ND28 in a MTM layout with full documentation and X-over
design.

[jwjarch]

Thinking about another direction on this re-build yet again. PE has the HiVi M5N's on sale for $18 a piece. I'm thinking a 2.5 way TMM with (2) M5N's per box would be a good way to go. I don't need earth shaking base or super high SPL. I modeled in Unibox and it seems workable. Trying to plug into PCD but that spreadsheet is a little beyond me. Can someone give me an idea of a XO design using DC28F-8 tweeters crossed over at 3,500 Hz?

[jwjarch]

So back to the drawing board on these. I took some more critical dimensions and realized the Dayton 175's won't fit.

Scott, I think I'm in the market for a few of those Peerless SDS (160F25PR01-08) woofers. I was also looking at the Peerless D19TD-05 tweeters to pair with the SDS. Where would you suggest crossing over? 3,500Hz maybe?

[Chris Roemer]

The ds"A"175-8 ALSO models well in there, w/a 7-1/2" long port. Almost any tweeter (that can cross near 2k) should be fine. The DC28 is not a bad performer and should work well w/the woofer, crossing near 2kHz.

[Millstonemike]

The Scanspeaks that Mike suggested are a bit more than I'd like to spend right now. Thanks for the suggestion though, Mike.

After a bit more looking, I think I would like to use the Dayton DSA175-8 due to their slightly better FR, and the look of the aluminum cones

I know, garage speakers. The Scanspeak just modeled so well in your enclosure I couldn't resist.

The DSA175 is really made for a small box ~6 L, but to my surprise will work well in 30 l (listen to Chris). It's an extended base alignment model, hence the dip circa 80 Hz. The series resistance in the XO helps flatten that (1.0 ohm shown in model). It'll take 45 w to breach xmax and seems like it' wouldn't bottom out all the way up 70 w. Your port may be a little short. If needed, a couple of extra inches would help flatten the low end peak (perhaps 2.5" PVC elbow with expoxy to secure it over the end of the existing port).

[jwjarch]

Thanks everyone for all the info so far. Bullittstang, to answer a few questions, yes, I would like to select my own drivers and build the XO's to suit them. Also, Scott, I plan on making a new baffle insert to fit the recessed area of the cabs and bring the drivers proud of the lip of the recess. So this only limits me to an overall dia. for the woofers really. Placement doesn't have to fit the existing cutouts exactly, since I will have a new baffle to do with as I please.

Chris, when you say the DS175 models "OK", would you have a different suggestion? The Scanspeaks that Mike suggested are a bit more than I'd like to spend right now. Thanks for the suggestion though, Mike.

After a bit more looking, I think I would like to use the Dayton DSA175-8 due to their slightly better FR, and the look of the aluminum cones. I'd like to pair with the Dayton DC28F-8. Does anyone have any experience with the DC28? Would it get the job done while I'm moving around the space working on various projects?

Scott, the Peerless stuff looks pretty good, but for some reason I have my heart set on the Dayton woofer right now. Would it be a horrible idea to pair the Dayton with an H26? Would the waveguide help in my garage listening environment?

Craigk, I'll be happy to take you up on the XO parts deal once I settle on a XO design.

[Millstonemike]

I like the Scanspeak Classic P17W00 6.5" woofer. This is a Vifa driver now manufactured by Scanspeak.

In a Extended Bass alignment cab of 30L with q 2 5/8" x 6 3/4" port, the Scanspeak will have an F3 of 38 Hz and will hit 104 dB SPL @ 40 W (before BSC). The FR graph looks like crossing at 2K will work fine ($77 each plus shipping). It needs a 5.75" cutout.

[craigk]

those look like nice cabs. I would save up some money and use some nicer drivers. when you get ready to build the xover let me know and I will help you out with xover parts at a very discounted price.