15" two way with natural roll off?

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Mike in NJ

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Joined 2012
#1
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#5
COPY the best reviewed complete design you can afford. Do not get locked into minmal Xover parts count.

Midbass -to- Horn_Tweeter time alignment is very important, and it is worth some research to study "quasi-optimal" crossovers, like the LeCleach work, which use 2-different slopes to improve phase and time alignment with long horns.

http://www.diyaudio.com/forums/mult...sover-high-efficiency-loudspeaker-system.html


Your best option is probably to KEEP READING until you find a well reviewed 2-way design which meets your cost, complexity, sound quality, and physical size requirements to copy.


The best 15" MIDBASS speakers have:
Mms ~70-90 grams
Le < 0.8mH
Qtc around 0.25-0.35
Bl around 15-20
well controlled cone break-up
 
#6
Thank guys - much appreciated!!!
Think I'll go with a proven design so I don't screw this up...
Thanks for all the attachments - the Pi designs should suit my purpose!
Thank you all again - this place is a awesome for a novice like me &#55357;&#56833;
 
#7
if the 2 way speaker is for home use in a larger room.smooth clean and loud if need be....and you have the budget for it..and you want something that you dont have to keep adjusting things ya cant go wrong with a proven design.. I just went with all new parts from Great Plains audio..... maybe its not what you want... Altec 19 .... 416-8 woofers 902-8A horn drivers.. Altec 19 crossovers that has a treble control.... all the parts that Great Plains audio send are first class !!..

The sound ?? i'll never sell mine.............
 
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#8
My project to use a 15" or even an 18" in a two way speaker system crossover 1.7Khz

Using a 15" or even an 18" in a two way speaker system, nominal crossover point at 1.7Khz

My ideas started with this thread

Cloning the BBC LS 5/1A

http://www.diyaudio.com/forums/multi-way/251630-cloning-bbc-ls-5-1a.html

I was lucky enough to find a pair in good condition, I like them which convinced me that big two ways work. That 15" Goodmans bass/mid is special.

So that cloning project is now redundant!! But a modern alternative is still on the cards.

As a result I have been thinking about this for a while; I did investigate 18" units but none were truly capable of any real sound quality up to this frequency,
one of the best 18" drivers from UK maker Precision Devices came close.

A 15 or even an 18" unit with rising response would have been desirable as this can be equalised / response flattened

with additional series inductance element with parallel resistance to match and integrate with the tweeter the equalised result matching the tweeter's sensitivity.

The tweeter I intended to use are between two the Seas T35C002 or the Audax TW034X0

Anyone have any thoughts or experiences they are prepared to share? I will look at some suggested by the OP.

Unless there are likely 18" drivers I will now look at 15" bass (bass/mid) drivers instead.
 
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#9
dandee said:
if the 2 way speaker is for home use in a larger room.smooth clean and loud if need be....and you have the budget for it..and you want something that you dont have to keep adjusting things ya cant go wrong with a proven design.. I just went with all new parts from Great Plains audio..... maybe its not what you want... Altec 19 .... 416-8 woofers 902-8A horn drivers.. Altec 19 crossovers that has a treble control.... all the parts that Great Plains audio send are first class !!..

The sound ?? i'll never sell mine.............
Click to expand...

Thanks for the pointer

an interesting link

Just read more really quite fascinated by this system the Model 604-8H-III
 
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#10
hey Darkmatter.. if you want something that can fill the room with concert levels with only a few watts of power..some even use tube amps with 1 w !!.. but I have not tried that yet... I like how everything is still clean and clear with the volume very low !
crossovers can make or break the speaker system sound...

Good luck... let me know what you come up with......... Ohio here.......
 
#11
the BBC diffraction slot could be important - I've used a few 18's past 1K in Karlson-type couplers with such HF as K-tube or the old Smith Distributed Source horn. The aperture width at the top can be critical to subjective sound depending upon things

Altec 421 15
UP7UIrO.jpg

Same K-coupler with Eminence 18 and topped with Smith Horn
8g2snnp.jpg

Eminence again - this was quite listenable even with the K-tube internally mounted - for a lower mass 18 EV made the 18B
kMwSfs1.jpg
 
#13
Darkmatter..............yes that would be a really great home stereo speaker system..

Thats what I should have bought and the cabinet could be a bit smaller.

I love the sound of a horn system.. but the crossover makes it work..

The Altec 19s cross over High at 1200 Hz... but that seems to work 100%

it makes the sound full and not tinny and I can never hear the crossover point when

Playing music... its seemless !!

The only draw back is cost?? that might be a lot of cash with the correct crossover...

on the positive note it should last a lifetime.... and the power requirement is low so that can save money..

Also... if you decide on something like that altec 2 way.. unless you BI amp.. you should consider the crossover that goes with
the speaker.. Those altec crossovers are designed to give the best sound possible.. and they are very high quality...

and that leaves more time to set down ,,,have a few friends over and listen to music !.. thats whats its all about...............
 
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#14
You could also consider using a small wideband driver like a Vifa tc9f.

It's cheep, sweet and easy to cross at 4 or 500Hz which opens up more options for 15" woofers.

Or a large waveguide from PE with a 1 inch tweeter will also up your tweeters low end efficiency and allow a lower xover to a degree.
 
#15
freddi said:
the BBC diffraction slot could be important - I've used a few 18's past 1K in Karlson-type couplers with such HF as K-tube or the old Smith Distributed Source horn. The aperture width at the top can be critical to subjective sound depending upon things

Altec 421 15
UP7UIrO.jpg

Same K-coupler with Eminence 18 and topped with Smith Horn
8g2snnp.jpg

Eminence again - this was quite listenable even with the K-tube internally mounted - for a lower mass 18 EV made the 18B
kMwSfs1.jpg
Click to expand...

Thank you for this excellent information with examples 🙂
 
#16
dandee said:
Darkmatter..............yes that would be a really great home stereo speaker system..

Thats what I should have bought and the cabinet could be a bit smaller.

I love the sound of a horn system.. but the crossover makes it work..

The Altec 19s cross over High at 1200 Hz... but that seems to work 100%

it makes the sound full and not tinny and I can never hear the crossover point when

Playing music... its seemless !!

The only draw back is cost?? that might be a lot of cash with the correct crossover...

on the positive note it should last a lifetime.... and the power requirement is low so that can save money..

Also... if you decide on something like that altec 2 way.. unless you BI amp.. you should consider the crossover that goes with
the speaker.. Those altec crossovers are designed to give the best sound possible.. and they are very high quality...

and that leaves more time to set down ,,,have a few friends over and listen to music !.. thats whats its all about...............
Click to expand...

Hi, Do you have any costings for the Great Plains Audio Model 604-8H-III drivers and the model N604-8A crossovers, do any published network information exist for those crossovers who want to roll their own? As delivery is likely to be expensive to the UK for both.
Thanks,
Simon
 
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#17
you can email them... and get current pricing...

pricing@greatplainsaudio.com

on thier website is lots of info...

I am sure if you want to build your own crossover
you can get info from bill the owner or from tech help...

there might be a crossover diag.. you can get.....

I will also look....... and let you know what I find...



you need a good room to play speakers like these.. they will put out
A ROOM FULL of sound.... with very little power input...

if you just want it loud you can do it for much less
with different parts..

if you want a room full of quality sound this is a top choice...

I did not find all the values of the crossover but if you Buy from Great Plains.. when you email them for pricing.. tell them you want to make your own crossovers... and if you can get information on what to use....
 
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#19
Mike in NJ said:
Hello, was thinking of making a 15" two way speaker, but wanted to take a minimalist approach to the crossover.
Does anyone know a good 15 incher that rolls off naturally so I can just use a high pass on the tweeter?
Was looking at this speaker - any advise is appreciated
Thanks
Mike
Beyma SM Series Speakers - Beyma SM Series SM-115K speaker - Beyma SM-115K 1,000 watt 15" woofer for all bass applications. Beyma SM-115K and other Beyma 15" speakers here.
Click to expand...

Getting back to the original poster's thread topic

I have been thinking about this

I do like the look of the driver that the OP is looking at it is smooth and reminds me of the JBL2226 unit, I wonder if others can comment on its midrange quality in a hifi sense?

SM115/K

The BD15 has a very smooth response

Beyma make a good unit that has response to 5K or so more of an upper bass/mid range unit

Beyma 15MI100

Beyma has another but still quite smooth to 3K a bass/mid this could work again anyone with experience with this unit, it would be great to receive feedback in thread.

SM-115/N

Precision Devices make two units that may be suitable
 
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