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Multi-Way Conventional loudspeakers with crossovers

3 way to 2 way up/down-grade
3 way to 2 way up/down-grade
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Old 11th July 2019, 04:19 AM   #1
suparub is offline suparub
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Question 3 way to 2 way up/down-grade

Hi Everyone ! I have first started a project with a 3 way system but because of power use + weight, I am now considering "transforming" it to a 2 way system.

Here are the drivers I use :
Bass : RCF LF15N401 - 15" Woofer
Midrange : RCF MB12N351 - 12" Mid Bass
Tops : RCF ND840 - 1.4" Compression Driver

Actual frequencies crossovers :
Bass : 35 - 150Hz
Mids : 100Hz - 1Khz
Tops : 1Khz - 1.5Khz

So on, my logic would be to get rid of the Midbass drivers and ask more from the subs and tops.

1 - Is it a good idea to build a 2 way system with these drivers ?
2 - If yes :
2A - what would I loose (frequency range / max spl) ?
2B - where should I set the crossover "cutting point"? I was thinking around 600Hz
3 - For the Sub, which kind of enclosure you would recommend ? I was thinking going for a Tapped-horn (THAM15) but Im afraid that this type of design will limit the frequency range over 200Hz. If not, I was simply thinking about a bass-reflex type.

Thanks in advance for you help again dear community !
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Old 11th July 2019, 05:49 AM   #2
picowallspeaker is offline picowallspeaker  Italy
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Quote:
Originally Posted by suparub View Post

So on, my logic would be to get rid of the Midbass drivers and ask more from the subs and tops.
To make a motorcycle out from a car you just eliminate 2 wheels, eh?
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Old 11th July 2019, 05:59 AM   #3
suparub is offline suparub
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Quote:
Originally Posted by picowallspeaker View Post
To make a motorcycle out from a car you just eliminate 2 wheels, eh?
XD good one. I wish I had this engineering knowledge. One of the reason I am here, learning everyday
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Old 11th July 2019, 06:15 AM   #4
gzubeck3 is online now gzubeck3  United States
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Quote:
Originally Posted by picowallspeaker View Post
To make a motorcycle out from a car you just eliminate 2 wheels, eh?
Everyone knows you need a chainsaw to to cut the car in half to make a motorcycle. :>)
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Old 11th July 2019, 06:19 AM   #5
gzubeck3 is online now gzubeck3  United States
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Quote:
Originally Posted by suparub View Post
Hi Everyone ! I have first started a project with a 3 way system but because of power use + weight, I am now considering "transforming" it to a 2 way system.

Here are the drivers I use :
Bass : RCF LF15N401 - 15" Woofer
Midrange : RCF MB12N351 - 12" Mid Bass
Tops : RCF ND840 - 1.4" Compression Driver

Actual frequencies crossovers :
Bass : 35 - 150Hz
Mids : 100Hz - 1Khz
Tops : 1Khz - 1.5Khz

So on, my logic would be to get rid of the Midbass drivers and ask more from the subs and tops.

1 - Is it a good idea to build a 2 way system with these drivers ?
2 - If yes :
2A - what would I loose (frequency range / max spl) ?
2B - where should I set the crossover "cutting point"? I was thinking around 600Hz
3 - For the Sub, which kind of enclosure you would recommend ? I was thinking going for a Tapped-horn (THAM15) but Im afraid that this type of design will limit the frequency range over 200Hz. If not, I was simply thinking about a bass-reflex type.

Thanks in advance for you help again dear community !
OK...No.... The 12 inch midbase has usable frequencies down to 45 hz. So unless you have some type of Horn implementation that can take you cleanly down to 300 hz crossover frequency I would stick with the 12 inch midbase.
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Old 11th July 2019, 06:50 AM   #6
chris661 is offline chris661  United Kingdom
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The 12" will only run down to 45Hz if loaded into the appropriate cabinet.


Suparub, a 15" 2-way is possible with these components. You'll need a fairly large horn for the HF unit, and I'd look at an 800Hz crossover. I would try to use digital processing for this one - high-power passive crossovers are difficult to do.

Cheers,
Chris
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Old 11th July 2019, 11:11 AM   #7
suparub is offline suparub
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Quote:
Originally Posted by gzubeck3 View Post
Everyone knows you need a chainsaw to to cut the car in half to make a motorcycle. :>)
ahahaha XD

gzubeck3 : Alright thanks sir ! So If I want to stick with 15" drivers (which is the strict minimum for me), I would need to switch to midbass types right ? Or, like you and Chriss wrote, find a way to build/get large enough horns in order to make them function from 300hz (is it even possible?) or 800hz ( which seems already very high to the sub to reach)
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Old 12th July 2019, 06:43 AM   #8
suparub is offline suparub
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Some updates ^^ I have been fortunate yesterday to hear in action the RCF EVOX 8 ( Product Detail - RCF ) in action and it sounds damn good !

From their specifications they use a 12" woofer in a bass-reflex and 8 x full-range 2" drivers, with a crossover cutting at 220Hz. So my question is : anybody has an idea how could I DIY build this same full-range part or at least the type of drivers I would need ? I haven't find these "8 x 2" Ultra compact fullrange, 1.0 v.c." drivers on their website.

RCF EVoX 8.JPG
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