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post #1 of 15 Old 04-08-2012, 02:54 PM - Thread Starter
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Hi.

A very close friend has asked me to help him build a center channel speaker for his home theater that he'll be piecing together over time. He currently has bookshelves, but will be replacing those in the future and isn't overly concerned with matching those as building something that's pretty good and can, in the future, build around. Normally I'd start with LR channels and then build the center, but he really wants a center to go along with his 70" lcd tv.

I've poked around the internet for a while and I'm considering pairing the following drivers.

4 (or 2) x SEAS Prestige ER18RNX (H1456) 7"
2 (or 1) x Vifa XT25BG60-04 1" Shielded Dual Ring Radiator Tweeter

I've built a few subs (including 2 dual opposed mfw's), but this will be our first attempt at speakers.


For simplicity I'd like to keep this in a sealed enclosure.

Any thoughts on or opinions on drivers or this project?

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post #2 of 15 Old 04-08-2012, 03:08 PM
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Check out HT Guide Mission Accomplished. Some real nice builds
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post #3 of 15 Old 04-09-2012, 04:09 PM - Thread Starter
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I looked over there, thanks. I'm not going to use someone else's project, but I think I should probably move to diyaudioprojects or diyaudio.

We've changed the woofer to the smalle model.
Seas ER15RLY * 4 drivers wired in parallel and series, which gets the spl closer to the Vifa, but just above.

Vifa XT25BG60 * 2 in series.

I believe the hardest part will be in the crossover design.

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post #4 of 15 Old 04-09-2012, 04:55 PM
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Quote:
Originally Posted by pgwalsh View Post

I'm not going to use someone else's project,

I believe the hardest part will be in the crossover design.

I've been building speakers since the mid 70's. the ones I tried to design myself sounded like crap compared to the engineered and peer reviewed designs available on the forums with published data.

IMHO, Unless you are really good and have the test equipment to test and tweak the final product you should re-think your project strategy.
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post #5 of 15 Old 04-09-2012, 04:58 PM
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Quote:
Originally Posted by pgwalsh View Post

I believe the hardest part will be in the crossover design.

Yes, which was why KGV suggested building someone else's design. Passive xovers are not easy to do well and there will be a steep learning curve and the need to buy/borrow an accurate mic and a rig to measure Z so you can input these into something like the PCD program. Textbook (or online) calculators are useless.

Horizontal MTM designs are a big fail if the intention is to use the centre to widen the lateral viewer area.
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post #6 of 15 Old 04-09-2012, 06:07 PM - Thread Starter
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Quote:
Originally Posted by A9X-308 View Post

Yes, which was why KGV suggested building someone else's design. Passive xovers are not easy to do well and there will be a steep learning curve and the need to buy/borrow an accurate mic and a rig to measure Z so you can input these into something like the PCD program. Textbook (or online) calculators are useless.

Horizontal MTM designs are a big fail if the intention is to use the centre to widen the lateral viewer area.

I already have several good mics and a recording studio. The software will be a problem. I'll keep your suggestions in mind.

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post #7 of 15 Old 04-09-2012, 06:12 PM
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As a n00bie who tried designing his own 3 way speakers once, yeah never again.

I'm now building Curt C's stentorian's and Sten 2's for my HT.
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post #8 of 15 Old 04-09-2012, 06:14 PM
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Quote:
Originally Posted by pgwalsh View Post

I already have several good mics and a recording studio. The software will be a problem. I'll keep your suggestions in mind.

Recording mics do not necessarily make useful measuring mics.

The software is free. PCD.
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post #9 of 15 Old 04-09-2012, 06:25 PM - Thread Starter
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Quote:
Originally Posted by A9X-308 View Post

Recording mics do not necessarily make useful measuring mics.

The software is free. PCD.

Thanks... I actually don't have Microsoft office, but may have to obtain a copy. I run Linux and OS X, but do have a vm with Windows XP.

If I find myself over my head, I'll probably look at the professional designs.

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post #10 of 15 Old 04-09-2012, 06:33 PM
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"...thanks. I'm not going to use someone else's project, but I think I should probably move to diyaudioprojects or diyaudio."

passive networks are really easy to do wrong and really difficult to do right.

the other guys are giving good advice and would be encouraging you if you were heading in the right direction...

here is an example of a two-way design. if you think that is within your capabilities...have at it...

http://www.avsforum.com/avs-vb/showp...postcount=3110

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post #11 of 15 Old 04-09-2012, 07:05 PM - Thread Starter
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Thanks for the advice. I'll try and see what my friend thinks of doing something like the Statements or something anlong those lines. Doesn't make too much sense to do everything from scratch my first time out.

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post #12 of 15 Old 04-09-2012, 11:04 PM
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The advice offered here is sensible. To design your own passive 2 way requires a proper measurement rig, including a measurement mic, measurement software and also software to help with xo design. Choosing drivers and designing the box is the easy part, and when someone asks for input on a project like this, it usually suggests they are jumping into the lake without seeing the rocks. Not sure I would call this task "very difficult" but instead just a bit more difficult than most are ready for. If something is "more difficult than you are prepared for" then it might as well be "very difficult" or even nearly impossible. So it becomes a question of whether you are prepared for what is involved. You are probably best to just find a good design and build it.
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post #13 of 15 Old 04-22-2012, 02:55 PM - Thread Starter
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Just wanted to thank you all for the good advice. We are going to build the Statements for my friend. We'll be doing the towers l/r to start.

I am also looking, for myself, to build something based off the SEOS and will be patiently waiting for bwaslo's or someone else's design(s).

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post #14 of 15 Old 04-22-2012, 04:50 PM
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just in case you haven't seen it, there are already some complete seos designs:
http://diysoundgroup.com/forum/index...f988&board=2.0

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post #15 of 15 Old 04-22-2012, 05:14 PM - Thread Starter
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Quote:
Originally Posted by LTD02 View Post

just in case you haven't seen it, there are already some complete seos designs:
http://diysoundgroup.com/forum/index...f988&board=2.0

Thanks. I have seen them and I did put 3 waveguides on order. Once they're shipping, I'd like to see what people do with them. Really cool project you guys started, I'm blow away with what you all have accomplished.

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