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Old 16th February 2015, 12:45 PM   #1
active is offline active  Canada
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Default medium active 3-way

This I like https://www.madisoundspeakerstore.co...idrange-3-way/

Acoustic suspention 3 way design.

What is the reasoning for dual mid ranges?

I am a novice speaker builder and would like to execute something like that or similar.

Are there other designs tried and tested utilizing the same make and model drivers, same sizes and specs....? I would like to do the bass bins in separate enclosures, with the upper boxes to rest on top. Why if your asking, its just to simplify the build.

Im serious about starting a speaker project and already invested in a multi channel amp to use in tandem with my 2 channel. and mini DSP.

Amplifiers Nad 120x2 and 35x4, would this be adequate? Im thinking the 2 channel having more heft would be happy powering those 12s and the 4 channel will work well power the upper ranges.

I was going to use an analog crossover but figure the digital will work better for me. I tested things on some 3 way acoustic suspension speakers that were store bought, fantastic. Except power handling is rated 100 watts RMS, they fold under pressure before I can get to levels Im happy with. Almost there, not quite. Clarity and sound separation is great. It really opened up when I removed the internal crossovers. This fueled my desire to get some bigger better greater power handling speakers into my room with some help.
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Old 16th February 2015, 01:12 PM   #2
sebbyp is offline sebbyp  United Kingdom
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Read these in the following order:
crossovers
The Design of Active Crossovers - Douglas Self - Google Books
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Old 16th February 2015, 07:21 PM   #3
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Originally Posted by sebbyp View Post

You read. I want to build a speaker, did enough reading for now
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Old 17th February 2015, 12:44 AM   #4
sebbyp is offline sebbyp  United Kingdom
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I didn't intend to be rude - those articles were invaluable and helped me create 4 pairs of active speakers to date... Although I have taken the digital approach.

Good luck.
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Old 17th February 2015, 01:21 AM   #5
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That is known as an MTM aka D'appolito. Midwoofer-tweeter-midwoofer - Wikipedia, the free encyclopedia
The want to build is great for all of us, but experience teaches us there is never enough reading done. Please read.

The sound you are most likely looking for is high effeciency. Instead of monster sized amps, a design that not only is loud but can do so without kilowatt amps. High Efficiency Speakers and more to read.
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Old 17th February 2015, 01:58 AM   #6
sreten is offline sreten  United Kingdom
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Hi,

The dual midranges are because its not easily done with one
small midrange given the current state of available drivers.

Take a look at : https://sites.google.com/site/undefinition/tarkus

But note fully active, if you had 100W for the bass,
30W would be fine for the mid and 10W for the treble.

rgds, sreten.

FWIW D.Self knows all the detail but none of the basics
when it comes to active x/o design. Basically he does
not understand hifi x/o design, active or passive.
There is not one reference to acoustic targets.
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Old 17th February 2015, 01:19 PM   #7
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Quote:
Originally Posted by active View Post
This I like https://www.madisoundspeakerstore.co...idrange-3-way/

Acoustic suspention 3 way design.

What is the reasoning for dual mid ranges?
With a passive crossover you do not want to dissipate lots of power into a resistor in order to reduce the woofer's output to match an inefficient midrange driver. Using two midrange drivers raises the midrange output to avoid this problem. It is not an issue with an active crossover where you would probably opt for one midrange driver.

Quote:
Originally Posted by active View Post
I am a novice speaker builder and would like to execute something like that or similar.
In the title you say medium but the SB12.3 is a large floorstanding speaker. An example of a more medium sized speaker using an active crossover. The woofer in this design has a better motor than the one used by the SB12.3 and is designed for medium sized ported cabinets.
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Old 17th February 2015, 07:04 PM   #8
Juhazi is offline Juhazi  Finland
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Good sources for designing multiway speakers with minidsp (including some basic stuff)
Stereo 3/4way Xover
miniDSP tutorials
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Old 17th February 2015, 09:35 PM   #9
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I have looked for alternatives with smaller mid bass but suitable bass drivers I found are rated just 60w. My reasoning behind the ones in my link is greater power handling (and output) with values more suited towards sealed chambers, not bass drivers designed to work with both sealed and vented. Im pretty sure I want to avoid dual purpose drivers here.

If power becomes a concern its not an issue I have two more power amps on the side not being used. Each high current 115x2 and 100x2. Also the Nad is bridgable to 70x2.

If I can find a similar design that employs smaller drivers suited for an ALL sealed environment I would be just as happy to take it on if it outputs the SPL I am after.

I read so much, knowledge is valuable. I think I have enough to begin but will never stop reading. I just need a little break. I didn't mean to be rude either.
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Old 17th February 2015, 10:52 PM   #10
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Quote:
Originally Posted by andy19191 View Post
With a passive crossover you do not want to dissipate lots of power into a resistor in order to reduce the woofer's output to match an inefficient midrange driver. Using two midrange drivers raises the midrange output to avoid this problem. It is not an issue with an active crossover where you would probably opt for one midrange driver.



In the title you say medium but the SB12.3 is a large floorstanding speaker. An example of a more medium sized speaker using an active crossover. The woofer in this design has a better motor than the one used by the SB12.3 and is designed for medium sized ported cabinets.
It looks like something I could be happy with, size and aesthetics are pleasing. Except for that fact. I have spendors that I favor as for a vented design. I dont wish for any more. My goal is to execute strictly acoustic suspension at this time. That size of linked speaker is ideal, really.

The pages on mini DSP and other I found helpful in my prior researching. Saved for future reference.
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