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Multi-Way Conventional loudspeakers with crossovers

3-way how would you do it?
3-way how would you do it?
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Old 14th April 2019, 07:13 PM   #1
arivel is offline arivel  Italy
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Default 3-way how would you do it?

Hi everyone. Thinking of a 3 way, if one day you felt like doing it, how would you do it? What would be the things to think about before choosing the 3 drivers that make it up and start designing? below I write what comes to mind: the first of all considerations is that of the best quality / price ratio without spending too much (thinking of a possible replacement in the future) and on this I think many of you agree.

Second consideration: how to split cut frequencies? to divide the frequencies according to the chosen drivers or to choose the drivers based on the chosen frequencies? But the real question is this, which technology to choose for each single frequency band? As for the low frequencies I believe that the choice is precluded to the magnetodynamic drivers but for the rest of the medium and high frequencies, which ones to choose?.

I would direct the reasoning to do this: which technology best expresses the medium frequencies? And which one for the high ones? Another important thing: the 3 drivers must be well blended, there must be a fusion between them and a synergy. They have to work well together without one of them prevailing over the others. Crossower: as simple as possible, slope? Active or passive ? you say. Requirements for placement in the environment and format of the boxes: the dimensions have their importance and since many people have small to medium rectangular or square rooms including mine, I think that the best choice is a tower leaning against the wall.

Sensitivity and pairing with the amplifier: on this I let you say. as for the choice of technologies, personally I would do it like this: magnetodynamic loaded to TL for the low ones, CD to compression for the middle ones, for the high ones I am still uncertain, maybe a tape? For now, it is not specific which drivers I would choose because I do not have clear ideas, I let you say which ones are better. I am aware of not being an expert so if I have written any nonsense please correct me as well.
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Old 14th April 2019, 08:55 PM   #2
PeteMcK is offline PeteMcK
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choose your midrange driver first, and spend the most money on it. Let that dictate the crossover frequencies. For a tower, use multiple small woofers, say 2x8" or 4x6"
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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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Old 14th April 2019, 09:37 PM   #3
Andersonix is offline Andersonix  Sweden
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3-way how would you do it?
Build a passive 2-way, but with plans for later bass addition, via active xo.

Choose your tweeter first, and spend the most on it. It dictates 80% of 'the sound' because the top end is where ALL the harmonics are. There are indeed very interesting 'planar' or AMT-type tweeters around today.
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Old 14th April 2019, 09:42 PM   #4
schiirrn is offline schiirrn  Germany
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Find a driver that covers at least 300Hz to 3kz without issues. Measure it. Choose lp filter so you stay clear of cone breakup. Find a tweeter that can be crossed where it needs to and that you like. As has been noted the tweeter WILL influence perception of mids and bass.
Find a woofer that can be used as high as necessary.
At least to start out go active.
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Old 14th April 2019, 10:59 PM   #5
Tromperie is offline Tromperie  Australia
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At least to start out go active.
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Old 14th April 2019, 11:43 PM   #6
adason is offline adason  United States
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Best 3-way is 4-way...
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Old 15th April 2019, 05:04 AM   #7
LineSource is offline LineSource  United States
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Quote:
Originally Posted by arivel View Post
Thinking of a 3 way, if one day you felt like doing it, how would you do it?
3 way how would you do it?

Is this a SEX thread???
Are you a SEX pervert, or just an Audio Pervert?
Audio Pervert! ........ well.... ok then....

Give us some solid info and goals....room + seating sketch, favorite music, budget, input sources -analog?, amplifiers -analog?, construction skills.... "The woodshop capabilities often determines the speaker design."

1) you can copy off of the Smart Kids ($32K Avalon beveled style cabinet(1"+6"+12"), $22K Sony AR1 (dual 8" woofers), $100k Magico style large radius cabinet for under $500/speaker + cabinet)
2) you can master DSP to "follow the $100k super speakers" ( for $2000/speaker + cabinet)
e.g....
You are Italian, but also a citizen of the World.
Buy some B&C and Faital, but seek value!

20,000 - 500Hz B&C DCX464 coaxial compression driver (Italy)
---SEOS24 waveguide (Poland)
500 - 40Hz Faital 15FX560 (Italy)
20 - 40Hz Dual Peavey 18" woofers, side-side mounted(Tiawan)
Attached Images
File Type: jpg Avalon with Sealed 12in.jpg (216.5 KB, 339 views)
File Type: jpg Sony AR1 dual_8.jpg (174.9 KB, 336 views)
File Type: jpg Magico TMWWW Rounds.jpg (210.9 KB, 335 views)
File Type: jpg Future BIG.jpg (185.8 KB, 333 views)
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Old 15th April 2019, 09:15 AM   #8
marco_gea is offline marco_gea  Italy
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Default Old school

I like the old-school approach of having crossover frequencies at approximately 500-700Hz & 5k-7kHz
(instead of the 200-300Hz & 2k-3kHz that are more common nowadays).

In other words:
Mid-woofer + Mid-range + (super)Tweeter
(instead of Woofer + mid-woofer + tweeter).

Marco
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Old 15th April 2019, 11:30 AM   #9
Charles Darwin is offline Charles Darwin  United Kingdom
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Talking old school if you are placing them close to a backwall I'd go for a wide and shallow cab rather than deep and narrow. No need to bother with baffle step 'correction'.


Also start off active and stay that way.
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Old 15th April 2019, 11:59 AM   #10
camplo is offline camplo
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12”-18” crossed at 130hz to a 4” crossed at 2.1khz to a dome tweeter...can’t beat it, naked midrange. Active 48/dbLw, tri amped powered by dsp amp for voicing and room correction.

I’m trying to figure out how to use a compression driver with same philosophy. A 12”-15” crossed at 500-700hz in a two way is the best I can figure. There’s like 3 compression drivers up for the task of either running all the way to 20khz or maybe crossing to a dome at 10khz for a 3 way. There’s also one potential AMT to cover 700hz-20khz, and at this point it’s a maybe.

I try to design for near and far field. With nearfield only one driver can be pointed directly at ear level. With the first 3 way, the mid is the center listening axis, the ka on the woofer is something around .55 so off axis is great and the tweeter being a dome is the best you can do dispersion wise
With the horn system, I can’t go low enough to provide the ka I want, barely getting to 2ish on the woofer, a sacrifice, so it would only make sense to offset that sacrifice to run a two way but like I said, it’s a great task for the top driver and beaming in top register is inevitable it will be at the center listening axis (the horn) which is slightly better than having the beaming coming from the dome tweeter, where as a 1 inch would seemingly beam above 13550 though I do not understand the dispersion characteristics of a dome completely. If you ran a AMT tweeter the center listening axis would have to be the tweeter because of how directional it is, and then you’d try to design around that, crossing *** low as possible to create low ka values for the mid and woofer.

Then there’s the fast speaker if you can find the perfect coaxial driver for the top and cross it as low as possible to a woofer.

I also could be crazy ��

Last edited by camplo; 15th April 2019 at 12:27 PM.
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