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Multi-Way Conventional loudspeakers with crossovers

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Old 12th September 2007, 05:03 AM   #1
markr89 is offline markr89  United States
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Default first speaker build-check me before i buy!

260-140 Dayton XO2W-2K 2-Way Crossover 2,000 Hz
297-406 HiVi RT2C-A Planar Isodynamic Tweeter
295-362 Dayton RS150S-8 6" Reference Shielded Woofer (x2)
260-265 L-Pad 100W Mono 1" Shaft 8 Ohm

well the project began as a db616tl and i wanted to put some better drivers in because i got a bigger than expected paycheck from my summer job (W00t). after pricing out a crossover from the db717tl, I decided to get the pre-built one because it was cheaper and easier this being my first project. so all the stuff up there is from parts express and any knowledge you guys can provide is greatly appreciated. (FYI these are being powered by a pioneer 1016tx-v HT amplifier (110Wx7ch., fronts are bi-ampable) and will be the front speakers in a home theater system i am building as i get more money.)
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Old 12th September 2007, 06:12 AM   #2
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The crossover is the most important -- and hardest part to do -- of any multiway speaker. If the XO isn't specifically for the drivers you are using then it is very likely not to turn out well.

A multi-way with a well executed XO will tromp all over a sytem with better drivers but a weak XO.

Myself i think XOs are eveil and tend towards 1-way speakers.

dave
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Old 12th September 2007, 09:03 AM   #3
sreten is offline sreten  United Kingdom
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Hi,

The short answer is it is a disaster waiting to happen.

build something like the floor stander of this :

http://www.zaphaudio.com/BAMTM.html

Or more upmarket a floor stander version of :

http://www.zaphaudio.com/audio-speaker16.html

or more compact a floorstanding version of :

http://www.eldamar.net/audio/RS150MTM/

/sreten.
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Old 12th September 2007, 01:39 PM   #4
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A "stock" crossover will not address response break-up peaks inherent with just about any metal woofer, resulting in a harsh, sharp sound that can quickly result in listening fatigue. These peaks are prominent in the Dayton RS line, which are fine woofers for the money by the way. The crossover will need at minimum one notch filter, a steeper slope, and a lower crossover point.
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Old 12th September 2007, 03:05 PM   #5
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Default 1st Design!

Ok , I looked up the specs on your desired drivers & yes you will need the attentuation for the tweeter as it is rather sensitive & needs the L-pad.
Do we have any response graphs available out there to nail down these anomalies in the woofer?
Perhaps you could run the Xover outboard of the enclosure so that we could tweak/modify to make up for the non-linearities.
The dirty way to do it of course is to get a twelve band EQ to tweak the response.........Oh yeah..thats' how they do it in the studio!....Plus with said EQ you could dial in the response for room acoustics also.
_____________________________________Rick.........
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Old 12th September 2007, 10:21 PM   #6
markr89 is offline markr89  United States
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heres the graphs for the woofers
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Old 13th September 2007, 04:12 AM   #7
markr89 is offline markr89  United States
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and heres the one for the tweeter- but im second guessing the planar isodynamic choice, ive read reviews touting their unmatched clarity but have also hear of poor off-axis response. i think the largest off axis angle in my listening room is 40 degrees, but i really care about the accuracy in the 30 degree range. worst comes to worst, i can always toe the speakers in towards me but then i don't want my friends to think i built poor speakers! Also, i love good soundstaging and detailed sound. Im just wondering if a good dome tweeter would serve me better (around 50-60 dollars)
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Old 13th September 2007, 05:41 PM   #8
sreten is offline sreten  United Kingdom
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Hmmm.........

what is wrong with the design here that has done all the
hard work for you (and not got it wrong in the process) ?

http://www.eldamar.net/audio/RS150MTM/

And yes you would be better off with a good dome tweeter.
The Seas 27TBFCG is a good choice, the above can use it.

/sreten.
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Old 13th September 2007, 06:10 PM   #9
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Quote:
Originally posted by sreten
Hmmm.........

what is wrong with the design here that has done all the
hard work for you (and not got it wrong in the process) ?

http://www.eldamar.net/audio/RS150MTM/

And yes you would be better off with a good dome tweeter.
The Seas 27TBFCG is a good choice, the above can use it.

/sreten.
I agree 100% - I use the TBFC/G and can vouch for it, as can Zaph and many others. It also comes in well below your price range. Better off-axis response and better tweeter period. I wouldn't buy into the "unmatched clarity" claims of planars, ribbons, etc. - these are subjective analyses and well designed domes prove to have lower distortion, which equals superior sound.
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Old 13th September 2007, 07:54 PM   #10
tinitus is offline tinitus  Europe
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I suppose only the best ribbons are worth the effort
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