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Multi-Way Conventional loudspeakers with crossovers

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Old 24th January 2005, 08:23 PM   #1
5.0 is offline 5.0  United States
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Default $300 budget for first DIY speakers, opinions?

I'm going to upgrade the speakers for my dorm room and i'm looking to spend around 250-300 dollars on everything. these will be used as just stereo speakers now, but possibly as rear surrounds in the future.

Here's my current plan -
woofer- dayton reference 8" ~$45
http://www.partsexpress.com/pe/pshow...=295-366&DID=7
midrange- dayton 2" dome ~$30
http://www.partsexpress.com/pe/showd...number=285-010
tweeter- dayton 1-1/8" silk dome ~$17
http://www.partsexpress.com/pe/pshow...number=275-075
crossovers- parts express 3 ways ~$14
http://www.partsexpress.com/pe/pshow...number=260-210
parts total = $210
after terminal cups, MDF, and paint, roughly $250.
possible front dimensions - 10" x 22" tall
QUESTIONS--
i'd like to arrange the speakers in a line (instead of having tweeter/mid horizontal). However, this would put the tweeter roughly 8 inches above ear level. would this be bad for imaging?

what would be a good sealed box volume? winISD suggests 1 cu ft.

would those components sound good together?

can I do better for the money?
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Old 24th January 2005, 08:39 PM   #2
ScottG is offline ScottG  United States
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same driver as this:
http://www.6moons.com/audioreviews/omega2/super3.html

amp of choice (though limited spl's)

http://www.6moons.com/audioreviews/sonicimpact/t.html
and here:
http://www.tnt-audio.com/ampli/t-amp_e.html

perhaps make a powered sub latter from PE's stuff.
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Old 24th January 2005, 09:05 PM   #3
cjd is offline cjd  United States
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If you use a stock crossover, don't bother with the RS. IMHO, they're not worth a whole lot since they assume perfect flat impedance on the drivers, and that's not realistic. I'm also not sure a stock XO would suit that dome mid at all.

In fact, I wouldn't bother with the RS using that mid and tweet - check out the Lyra - I think it may be just what you're looking for.

And, absolutely keep the tweeter to mid alignment vertical if you can!

Or, step up to the higher end drivers and simplify things a bit and go with a 2-way. Lots of options out there. One such as this one I just completed might do well, particularly if you go with the sealed alignment. Cost is about $250 with enclosure.

C
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Old 24th January 2005, 09:13 PM   #4
Greg B is offline Greg B  United States
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Ditto on everything. The lyra looks like the answer to me.

AFA imaging, 8 inches above your head is pretty irrelevant, IMO, but good phase matching in the crossover is very important.

GB
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Old 24th January 2005, 09:28 PM   #5
Ahab97 is offline Ahab97  United States
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With the drivers you have, you could basically build these:

http://www.partsexpress.com/projectshowcase/jubilee/

You'd end up spending a little bit more for the more complex crossover, but the improvement in SQ because of it would be worth it.
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Old 24th January 2005, 09:28 PM   #6
5.0 is offline 5.0  United States
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Quote:
Originally posted by ScottG
diyAudio Full Range Reference Project

same driver as this:
http://www.6moons.com/audioreviews/omega2/super3.html

amp of choice (though limited spl's)

http://www.6moons.com/audioreviews/sonicimpact/t.html
and here:
http://www.tnt-audio.com/ampli/t-amp_e.html

perhaps make a powered sub latter from PE's stuff.
i won't be needing an amp, i've got a reciever thats running my current speakers. actually i built a sub too (a housewrecker - from decware.com)

i took a look through that thread, the idea of a single driver is probably something i'll try sometime, but not this time around. thanks though!
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Old 24th January 2005, 10:04 PM   #7
5.0 is offline 5.0  United States
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i'm more than happy/capable of custom making a crossover, roughly how much would that cost me?
if that tweeter/mid aren't up to par w/ the Reference, could you suggest others that would be?
this tweeter any good? - http://www.partsexpress.com/pe/pshow...=264-582&DID=7
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Old 24th January 2005, 11:48 PM   #8
cjd is offline cjd  United States
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The XT19 still needs a rather capable midrange. Good tweeter though - right range. The XT25 can be crossed straight to the RS225 with the right crossover, but that's not cheap.

For what it's worth, I have a TMWW sketched out that would cost about $350 *each* using a pair of RS225's, an RS150, and a Seas 27TDFC (that cost includes crossover). I just sketched out a TMWW using the same tweeter but the RS125 and a pair of RS180's that isn't that much cheaper (though it is still less - I think ~$250+ ea.
maybe?) The big difference is size and bass extension.

A similar TMWW I did using Dayton Classic drivers (with the tweeter you initially picked out) is about $350 for the pair.

Using the tweeter and mid you picked out up front, the Lyra is a standout, done by a very respected designer. I do not think you would be unhappy.

If you really want to go with those RS drivers, take a peek here for a 2-way. Somewhat complex in the crossover.

For 3-way speaker expect to spend as much or more on the crossover as you do on drivers.

C
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Old 25th January 2005, 07:28 PM   #9
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Quote:
Originally posted by 5.0
i'm more than happy/capable of custom making a crossover, roughly how much would that cost me?
if that tweeter/mid aren't up to par w/ the Reference, could you suggest others that would be?
this tweeter any good? - http://www.partsexpress.com/pe/pshow...=264-582&DID=7

Have you ever designed a crossover before? If not, know that it is a lot more difficult than just choosing a crossover point and slope. A good crossover shapes the frequency response and impedence of the speaker, in addition to dividing the signal. This requires a lot of calculations, measurements, listening, and time.

For the money, here are some great options:

1. The MB20 or MB27 (www.murphyblaster.com) are widely respected and inexpensive. Dennis Murphy is one of the leading DIY crossover designers around.

2. Wayne J's Dayton III is a GREAT sounding speaker. It doesn't use high-end drivers, and I'm sure it doesn't measure very well, but it is extremely nice to listen to. Most non-audiophiles would probably think it sounds far better than a lot of high-end systems. The bass in particular is very strong, and I think you can build it for $150.
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Old 25th January 2005, 08:45 PM   #10
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For the money, you'd be way ahead with a 1-way or 2 way speaker (given that you already have a sub, these become 2-way and 3-way anyway)

dave
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