Dayton DA175 design thread

[Brian Bunge]

I use Unibox. I too am using 1ft^3 or 28L. With heavy stuffing, I get the port length mentioned above. Without it, I'm getting 8.39".

[cobbpa]

Looking at the modeled xover...this is probably because I'm just green at this & haven't been around a while, seems like a decimal thing, but... 400 uh & 700 uh...micro henries? I don't know how to buy those, or must those be unwound?

[Dennis H]

400 uH (micro henries) = 0.4 mH (milli henries). The latter is how most suppliers list them.

[cobbpa]

Thanks Dennis, I just got thrown by both being used in the same schematic.

[Nathan P]

okay, so we have the basic design, is the crossover done, or almost there?

[BobEllis]

I'd consider the crossover almost there. Some tweaking needs to be done to achieve a deeper reverse null. I won't have time to work on it until maybe next week.

If you haven't found them yet, look for Claudio Negro's SW tutorial and the SW manual - both are invaluable getting going both in using the program and understanding how the crossover works. Try bumping each component up and down a good chunk and see what the impact on FR and phase is. I'm SO glad I don't have to run through the math on this like we did in the 70s

Sorry for the mH uH confusion. SW seems to default to uH, but I plugged in some mH values I knew were standard and didn't get them all.

[Nathan P]

Okay great. I'll try to find those, I tried to do some stuff with it but I was lost.

[cobbpa]

I'm SO glad I don't have to run through the math on this like we did in the 70s

The thought of that disgusts me.
But I'm only 20, so I'm probably just accustom to having computers do a lot of work for me. Regardless..what a task that has to be..

[ThomasW]

I'm SO glad I don't have to run through the math on this like we did in the 70s

That combined with our measurement tools in those days... :B

[Nathan P]

So has anyone gotten any updates on the drivers?

[BobEllis]

Pete has a business to run, so I wouldn't expect much to happen until the weekend. If I understood his progress report, the DA175s were still in the baffles when he offered them up. Give him time to pull them and box them up.

[Nathan P]

Okay, I was just hoping I could get them before school is back in, I have next week off for spring break.

[Brian Bunge]

BTW, just wanted to let you guys know that this driver is the Deal of the Weekend at PE. They are $13 each, limit 4. So if you guys need extras, now would be a good time to buy them.

If I thought I needed to build any more of my 3-way towers using these anytime soon I'd snag a few.

[PMazz]

Sorry guys, hang in there . I have them out of the LAs and into their boxes. They'll go out next week hopefully.

Pete

[Nathan P]

Thanks Man!

[KJP]

FWIW these woofers are $13 DOTW for those that want to do more than what they are planning with the PMazz clearance parts.

[Exocer]

Pmazz, thanks for your generosity! :B

[Nathan P]

After building my first speaker at home, and finding out how much sawdust mdf makes, I've come up with a solution: Use the shop at school! There's a giant fan to pull the dust out of the air and such, besides, there is sooooooo much cool equipment.

[Exocer]

Wish my campus had a woodshop. I do most of my routing outside, right in front of my townhouse :T

[Nathan P]

Yeah, if I do anymore at home it will be with an extension cord over the grass. Besides, there's better light out there

[jkrutke]

FWIW these woofers are $13 DOTW for those that want to do more than what they are planning with the PMazz clearance parts.

I've noticed that, and it's quite a good deal. These speakers have surprisingly good performance for their bargain basement price. So what the hell, I picked up 4. I've always wanted to do something with these, and a floorstanding TMM tower may be just the thing. Just need to pick out a tweeter, and place the project in line after a few other current projects.

Brian Bunge: beautiful cabinets on your floor standers, I bet they sound great.

[Brian Bunge]

Brian Bunge: beautiful cabinets on your floor standers, I bet they sound great.

Thanks! I really appreciate it! These turned out really nice, but the cabinets in figured cherry were still my favorites:

Image not available

[derekbannatyne]

Wow those are nice, how much do you think you spent on the pair not including the veneer?

[Brian Bunge]

I'd have to double check, but I think that the mids and woofers were about $100, another $60 or so for the tweeters, and maybe another $100 for the crossover parts. But those are just guesses. Oh, and about $20 or so for MDF. The pricing on the drivers and crossover parts might be a little low because I get dealer pricing from both PE and Madisound.

[Nathan P]

Wow, if I didn't know better I would have thought those would have cost like, $500 each or something, especially if I didn't know they were DIY. Those are mighty impressive.

[Brian Bunge]

Well, I won't tell you what I charged the guy to build them then, but it was more than $500 each. Thank you for the compliments.

[Exocer]

Anyone considering ordering just two more drivers since they're on sale and building a pair of MTM bookshelf speakers? I read somewhere that MTMs can be designed to run more effeciently than MT's. Would it be possibly to design a pair of MTM's with this driver that are are rated at 89 db/watt sensitivity in a sealed 1.0 cu enclosure? :P

[Nathan P]

Sweet news guys, my drivers arrived today, they look great! So who's going to build these things first? I can't afford the tweeters as of right now, but I'm saving for them.

[Exocer]

yeah they look better in person than online pictures can show. I cant decide between buying two more driver and going with a pair of MTMs or a pair of sealed TMs.

[KJP]

Nathan,

You have a PM.

[Nathan P]

Kevin, you have a pm. or two.

Nathan

[Nathan P]

Well, KJP and I were doing some calculations on this woofer in WinISD and found that it can only take about 10-15W in a ported box. This is fine for me, but I'm not sure how it effects you guys.

[Exocer]

I wanna go the sealed route if thats the case.

On the white paper, it lists Q of .6 , .7 , and .8. Which would be the most "musical" and what does the Q tell us about the sound quality?

[ThomasW]

O.50 is the most musical

[Rudy Jakubin]

That's also one bog box ---> 200 litres!!!
I'm going for .59 with 4 DA175's in a 2.5 either a K1 or Vifa Neo tweeter.

[Nathan P]

Okay guys, I've been playing around with WinISD, and I was wondering which graph I should be looking at? Kevin was showing it to me and it was showing what power levels exceeded the powerhandling of the driver, but I can't seem to get that now.

[Nathan P]

Okay, I've been playing around with the excursion etc, and I found that if you cross this driver over to a sub at around 100hz, then you'll be a okay with either a ported or sealed box at much higher amperages, it is rated at 50 but WinISD says it would be fine at 90 crossed over there. but at that point the graphs are very similar for both, so it is a wash. If you have no sub, you can run it in a ported box and get a pretty flat curve all the way to around 30hz, but you can't get more than around 93db out of it, which is more than enough for my small room, but hey, I'm probably going to power these things with a T-amp, so my priorities are a little different. Then again, as long as I do the crossover on the amp correcty, I could hook these up to just about anything around 100W and just not turn it up too high, as long as there is a sub.

[Nathan P]

I'm no longer using the seas tweeter, I got a couple of modded dayton tweeters from Kevin(KJP). The crossover will be a little different, but it should be similar as this tweeter has a similar resonant frequency and response. I was wondering, since this driver is only rated at 50W, what were we planning on using these for? At that level it's only good down to around 100hz. Is that what we were planning on? Or was the plan all along to do a lower power speaker? What level were we going to run these down to Hz wise?

[Nathan P]

has anyone made any progress?

[Exocer]

I haven't made any progres..Instead i've been following your lead.

[Nathan P]

lol, I was trying to follow the lead.

[Nathan P]

So has anyone else made any progress? I ran out of money and time at about the same time so I haven't even gotten my enclosures built. ops:

[BobEllis]

bialagora90 - your private messages are turned off so I could not reply to yours. I never went anywhere with my design. You should consider Zaph's BAMTM.