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Old 14th December 2011, 09:55 PM   #1
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Default Tower Build Help

I am new to home audio and to speaker building, but I am trying to build a set of tower speakers to go with my home theater system. I would like to run a 3 way design and have been thinking about these

Dayton RS28a Tweeter
Dayton Audio RS28A-4 1-1/8" Aluminum Dome Tweeter 275-130

Dayton RS225 8in Woofer
Dayton Audio RS225-8 8" Reference Woofer 295-356

DIY Cable Exodus EX-Anarchy Midwoofer
DIYCable.com : Intro Home Exodus Anarchy

Since I have little knowledge in crossover design I would like to try to use pre-built passive crossovers or an active crossover that i could tune myself. Any help you can give me in driver and crossover choice would be greatly appreciated. Building the cabinet will not be a problem, but after parts are chosen I may need help with the design of it.

Tell me what you think, thanks.
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Old 14th December 2011, 10:59 PM   #2
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Your selection of drivers are kinda all over the map.Note the sensitivity of your Mid-woofer, at 84 Db your system will be a power eater. You system is only as efficient as the least efficient driver. The cool thing about towers is they are ripe for MTM arrangement , or two woofers with the tweeter placed between the two. Effectively a two-way this set-up gives you great imaging. Using two 8" drivers will be a bit of a challenge getting the frequencies to overlap effectively. PE has two-way crossovers with connections for two woofers, exactly what we're after. I would phone-up PEs' tech line as I don't know if these crossovers have impedence compensation or allow for the two woofers to venture into the 4 Ohm range when they cross.
The biggie on MTM is the De Appolito "effect", or symmetrical lobing effect.

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Old 14th December 2011, 11:05 PM   #3
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I can toss out the mid-woofer, it just seemed to have a good build quality and a good frequency response, I forgot to look at the sensitivity. I am not set on any of the drivers I posted above, they just looked good to me after looking at other builds online. I like the idea of a MTM with two 8's, but I was afraid of the frequency overlap like you pointed out and that is why I added the Exodus 6.5

I'm really open to any set of drivers that can give me a wide range of low distortion frequency response with good output.
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Old 14th December 2011, 11:50 PM   #4
sreten is offline sreten  United Kingdom
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Hi,

I've already answered this by PM, why bother with PM if
you want other opinions? FWIW I suggested : Daedalus
as it uses two of the wanted drivers.

An MTM with two 8"ers is not good with current 8" drivers, if ever.

If you can't build a c/o from a parts list and diagram you should have
said so, but if you wan't anything decent you will have to learn.

Stay the hell away from from simple active c/o's that can't be set
to do the job properly and even more away from passive off the
shelf c/o's that are an utter disaster area waiting to happen.

rgds, sreten.

http://sites.google.com/site/undefinition/diy (see if nothing else, the excellent FAQs)
http://techtalk.parts-express.com/sh...d.php?t=219617
http://www.zaphaudio.com
http://www.zaphaudio.com/ZA5/
http://www.rjbaudio.com/Audiofiles/FRDtools.html
http://web.archive.org/web/200909021...esigningXO.htm
http://www.rjbaudio.com/
http://web.archive.org/web/200909022...ve99/Spkrbldg/
http://speakerdesignworks.com/
http://www.htguide.com/forum/showthread.php4?t=28655
http://www.deadwaxcafe.com/vzone/david/david.htm
http://www.troelsgravesen.dk/Diy_Lou...r_Projects.htm
http://www.humblehomemadehifi.com/download.html
http://www.quarter-wave.com/
http://www.frugal-horn.com/
http://www.linkwitzlab.com/
http://www.musicanddesign.com/

Great free SPICE Emulator : http://focus.ti.com/docs/toolsw/fold...t/tina-ti.html
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Last edited by sreten; 15th December 2011 at 12:09 AM.
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Old 15th December 2011, 12:17 AM   #5
just another
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Hi Sreten, Blame me I suggested opening a thread, as I thought that my suggestions alone were not enough. The Daedalus looks like a well executed project, I particularly like that he made the speaker workshop file available for download.

Tony.
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Old 15th December 2011, 12:23 AM   #6
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re: 'I've already answered this by PM...' LOL, so have I, FWIW I suggested a design nearly identical (post 3) - HTGuide Forum - Summary of key information from the 3-way WTMW / TMWW thread

re:'If you can't build a c/o from a parts list and diagram you should have
said so, but if you wan't anything decent you will have to learn' - yes, but us 'old hands' take so much for granted,
perhaps a link to a really simple primer on crossovers would help the OP realise it's not that hard, once some basic understanding is reached
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency

Last edited by PeteMcK; 15th December 2011 at 12:39 AM.
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Old 15th December 2011, 12:25 AM   #7
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Sorry for my uncertainty guys, I'm very indecisive
PeteMck sent me a link to this
HTGuide Forum - Summary of key information from the 3-way WTMW / TMWW thread
and I am really liking the look of that design, it seems to do everything that I am looking for and is a proven design that I can emulate and learn from
I couldn't find the parts list on that build though, I must be missing it
is parts-express the cheapest place to get the parts for that build?

Thanks for all the replies, I appreciate it
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Old 15th December 2011, 12:34 AM   #8
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My next question is what would be the best way to power them? Crown amps caught my eye
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Old 15th December 2011, 12:37 AM   #9
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Quote:
Originally Posted by ninjawhiteboy12 View Post
My next question is what would be the best way to power them? Crown amps caught my eye
I'm sure that one could do better, and not spend more money.

Have a look around and see what other people are using (a large proportion will be diy)

dave
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Old 15th December 2011, 01:30 AM   #10
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re:'I couldn't find the parts list on that build though' check the zip files here: HTGuide Forum - Dayton RS WMTW Center & TMWW Mains

I had a quick squiz at the Daedelus, it only has one woofer & a more complex xover than Dennis Murphy's Dayton WWMT tower
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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