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BigJake82 06-03-2019 06:29 PM

Assorted Projects
 
2 Attachment(s)
Got a few projects I'm going to be doing over the summer I figured I would document them here. I usually keep my projects to myself but figured, what the hey someone might be able to glean something useful.

I'm a pretty busy guy so updates and progress might be sporadic. Also, my wood working is mediocre at best so don't expect to see any overly fancy enclosures, plywood covered in Durtex will be about it.

First project is a budget 10in/CD LCR using a Eminence Deltalite 2510-4, and a PRV 290Py-S on a Dayton H6512 Waveguide.

I have waffled back and forth a bit on this project on whether to go active or passive. At first I was going to do active with a couple Minidsps. Hooked them up, started using them, heard how load they where on the compression driver, immediately disqualified them. I have a fair amount of passive components laying around so I figured that I would save the Mindsps for a future project on a much less sensitive speaker, and design a passive filter. Got a passive filter that I was pretty happy with and was going to go that direction. Then when I was browsing around ebay looking at clone amps and found a company that sells a clone of a Ashly Protea 4.8SP for $350 and shipped from Ohio. Haggled with them a bit, got down to $330, and pulled the trigger on it. So that should be here tomorrow sometime, and we will see how it goes. Attached below is a picture of my crappy scrap wood test box and response of the passive crossover at 0, 45, 60 at 2 1/2' respectively. Angles were approximate, and SPL differs slightly due to mic distance.

Second project will be a 5.2 system for the bedroom.

My wife is mobility limited so we spend quite a bit of time in here.

Haven't quite hashed this one out yet, subs will be a couple Alpines SWS 10's I have laying around in vented enclosures. I'm leaning towards Peerless XT25TG30 tweets and Dayton RS150 Mids for LCR and Surrounds, I've worked with both of these before and offer good price/performance. The system will be a mix of music/movies/tv/games. Needs to sound good, be relativity small, and doesn't need to play at reference, wife doesn't like it that loud anyways. I do, but have other places for that.

When these get done, who knows.

BassThatHz 06-03-2019 07:13 PM

Those measure really well.

Samps 06-03-2019 07:28 PM

Looks good. That waveguide appears to be a nice match with that CD. How many components in the CDs xo network?

When you build the final box it might help to get the woofer a little closer to the waveguide. You have a pretty big space there now.

BigJake82 06-03-2019 08:30 PM

Quote:

Originally Posted by BassThatHz (Post 58137084)
Those measure really well.

Thanks, I think for $60ish this CD/waveguide combo is pretty hard to beat.

Quote:

Originally Posted by Samps (Post 58137152)
Looks good. That waveguide appears to be a nice match with that CD. How many components in the CDs xo network?

When you build the final box it might help to get the woofer a little closer to the waveguide. You have a pretty big space there now.

CD has 6 components total. I suppose I could post the schematic tomorrow if your interested, it's on my office computer.

I'll probably tighten them up a little on the final enclosure. They are about 1/2" apart right now and I'm crossing it over at about 1500hz so it shouldn't really effect too much.

BigJake82 06-04-2019 01:02 PM

2 Attachment(s)
Here's the crossover schematic, on-axis response with phase.
Protea 4.8 clone came in today so hopefully have a chance to mess around with that in the next day or two.

BigJake82 06-09-2019 12:14 PM

2 Attachment(s)
The Protea Clone is definitely significantly quieter then the Minidsp. I could hear hiss from the minidsp 10ft+ away easily, I can hear some hiss from the Protea but only about 2ft-3ft away in a quiet room. The software that came with the Protea Clone wouldn't install correctly but all the Ashly drivers and software from their website work.

I order the rest of the drivers for the the LCR and ordered a Peerless XT25TG30 and a Dayton RS150-4 so I can start designing the speakers for the bedroom system. I think I'll try and use the minidsp's in the bedroom system, should be fine since these drivers are only 89-90db 1w/1m vs 96 and 109 respectively.

After some fiddling around this is the frequency response that I decided on, definitely flatter then the passive crossover, sounds better too I think. First attachment is the response/phase using the Protea, second is Protea response vs passive filter.

dorri732 06-10-2019 05:37 AM

Quote:

Originally Posted by BigJake82 (Post 58160984)
I could hear hiss from the minidsp 10ft+ away easily

This is interesting to me. I've never heard anyone say that before.

Has anyone else had this issue with the MiniDSP?

jevchance 06-10-2019 06:37 AM

Do you have a link for the Protea clone?

BigJake82 06-10-2019 12:04 PM

Quote:

Originally Posted by dorri732 (Post 58163394)
This is interesting to me. I've never heard anyone say that before.

Has anyone else had this issue with the MiniDSP?

I did a little research after I had my noise problems with the MiniDSP and found that it's pretty common with high efficiency speakers. I'm debating getting some autoformers to see if I can eliminate the noise entirely, we will see when I have them hooked up in my actual setup.


Quote:

Originally Posted by jevchance (Post 58163528)
Do you have a link for the Protea clone?

Here you go, looks like they raised the price a little.

https://www.ebay.com/itm/4-8SP-4in-8...72.m2749.l2649

jevchance 06-10-2019 01:53 PM

Very cool, looks like a nice piece of kit.

BigJake82 06-14-2019 07:21 PM

5 Attachment(s)
Progress,

Kind of a slow day so I cut all the parts for the Deltalite/PRV LCR. All the parts came out of a 4x8 sheet of Baltic Birch. In the background of one pictures you can see a couple of my "table saws". Kind of expensive for speaker building, and you have to wait a few hours for the parts to dry, but sure is a lot easier then cutting them by hand;)

I should have 4 hours or so on Sunday, hopefully that enough time to do most of the finish work, painting, durtex. We will see I guess, getting a bit anxious now to get these done and installed.

K9woofer 06-15-2019 10:34 PM

Waterjet?

BigJake82 06-17-2019 10:34 AM

1 Attachment(s)
Quote:

Originally Posted by K9woofer (Post 58187916)
Waterjet?

Yep, not as good as a Router for wood, but better then hand cutting.

Didn't quite get as much done yesterday as I wanted. I did get a chance to round all the corners, sand the joints flat, and fill all the nail holes and a couple chip outs.

I don't know why it rotates some of my pictures.

Almost forgot, I ordered a SB Acoustics SB26CDC-C000-4, and a SB Acoustics SB17NBAC35-4 as another contender for drivers for the bedroom system. I'll pit these up against the RS150-4, and the XT25TG30 and see which I like better.

BigJake82 06-19-2019 03:30 PM

Finished, kind of.
 
3 Attachment(s)
Well, I got the enclosures all done. I found that one of the Deltalites I bought a year or so ago was badly damaged. I got one from parts express (the one I used for all designing) and two from amazon. I stupidly never opened the amazon ones, one looks fine the other looks like the pic attached. The amazon packaging was garbage, each speaker was literally speaker thrown into an empty box. I just went ahead and 2nd day shipped one from parts express so I would have it before the weekend. Looks like I'll be running stereo for a few days. Attached are the finished enclosures, they are decent, but I wished I spent a little more time on finish work but nothing too noticeable.

My SB Acoustics drivers showed up from Madisound today so I'll start building the test boxes for these and the RS150/XT25. I have a feeling the SB stuff is going to win out since the drivers are lower distortion and more modern designs, but we shall see.

BigJake82 06-21-2019 03:05 PM

Got the LR and sub integrated and bass response EQ'd. Listened to some music and did a couple quick movie clips, they sound great! The off axis dispersion gives a nice wide sound stage, they have a real effortless sound to them. Each one has it own Crown XLi 1500, or X2000 (same thing). The only problem I had was the non-broke in 290Py-S driver was about 2db lower than it should be. It could just be the difference in the gains on the amps though, I'll take another measurement after it's been broke in and see if it changes.

My other Deltalite showed up so I'll get the center installed tonight.

Going to start to put together some test boxes for the bedroom speakers, take some measurements, do some listening and start deciding which direction I'm going to go.

BigJake82 07-09-2019 06:58 PM

Well I decided on using the SB Acoustics drivers after building test boxes for both speakers and taking several measurement and extend listening comparisons. I replaced the SB17NBA35-4 with a SB17CAC35-4 for a woofer with the SB26CDC-4 for the tweeter. The CAC is basically the same driver as the NBA with a ceramic coating. I was actually surprised how much the ceramic coating did, considering how close the factory FR measurements were. The breakup peak is damped about 3-4db from the alum version, but what surprised me the most was the superior distortion performance from 100-600hz, especially below 250hz.

I'm using a MiniDSP on these and haven't had any noise problems, so they are good to go for less efficient designs (<90) but a no no for high efficiency designs (95+)

I have a couple PE .38cuft finished cabinets from when they closed them out that should be perfect for this build. I also built some steel wall mount brackets that I need to finish up and paint, then these will be ready to install in the bedroom.

BigJake82 07-15-2019 06:30 PM

3 Attachment(s)
Here they are in the boxes, might redo the baffles at some point they look ok but are far from perfect. Still haven't finished the wall brackets yet, hopefully I can get to them this week sometime.

Well I guess I can show the flat pattern, and the model of how they should look when installed.


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