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Old 21st March 2014, 08:30 AM   #1
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Default Mounting B&G two Neo10 side by side in an encosure

I'm working on a design that needs two B&G Neo10.
I don't really have the room to mount one above the other (vertical alignment).

So I'm wondering what the acoustical effects would be from mounting them side by side.

This will be in a (passive for now) 3-way with a Vifa NE225W-08 woofer and a tweeter that I have yet to decide on, in a 1.2 ft^3 passive radiator enclosure.
I plan on crossing woofer to mid at around 250Hz or so. This is only intended as a near-field speaker, so high volume isn't going to be an issue.

What do you guys think?

Bob

P.S. I have experience with the woofer and mid panels (from VMPS) but none with anything from B&G.
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Old 24th March 2014, 04:22 AM   #2
Face is offline Face  United States
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Why does it call for 2 NEO10's?

By placing them side by side, horizontal dispersion will be much narrower, giving them the horizontal coverage of a 10" woofer.
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Old 24th March 2014, 07:53 AM   #3
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That's a good question. The reason is that I will be crossing them at about 250-280hz with a first order crossover.
One of the main goals of this "trial" is to keep the speaker properly time aligned and in phase. So without adding at least 6 more crossover components to the design (and the added effects of those components), I have to make sure the Neo10s aren't over-driven.

Eventually this will become an active tri-amped speaker. I was originally planning on using two Neopannels from VMPS (Brian and I had discussed this design a few times over the phone) and angling each of them about 5-10 degrees off center (to counter the narrowing dispersion). Life kept getting in the way of actually building a test rig to see how it would work. Now that the Neopannels are no longer available, I'll have to start working with the Neo10s. But I wanted to see if anyone else had tried it before I drop the $400 for a pair of the Neo10s.
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Old 24th March 2014, 12:39 PM   #4
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Smile Neo 10

Check out the link I have provided. It should give you some answers to your question.Serenity Acoustics Super-7, Serenity Acoustics The Super-7
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Old 24th March 2014, 01:35 PM   #5
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How about a speaker that uses dual Neo10's as the M in a MTMWW style arrangement?

RMAF new stuff, new stuff.... (pics on page 2)

Edit Note: maestrok1 and I must read the same forums.

Last edited by Jim Griffin; 24th March 2014 at 01:38 PM. Reason: addition
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Old 24th March 2014, 01:46 PM   #6
Face is offline Face  United States
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First order at 250-280hz will not protect those drivers enough. Do you have a measurement setup?

First order slopes don't work well very often and it's very obvious when they're not working as the speaker will sound harsh or strained. You need very wide bandwidth drivers and they have to be crossed in their comfort area, not at their limits.

If you look at some commercial offerings that advertise first order slopes, you'll notice they're using MUCH more than a simple cap or coil for a crossover. Believing that adding more parts will make the speaker sound poor is a fallacy by those who don't know how to correctly design a crossover.
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Old 24th March 2014, 02:11 PM   #7
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Quote:
Originally Posted by Face View Post
By placing them side by side, horizontal dispersion will be much narrower, giving them the horizontal coverage of a 10" woofer.
This may be exactly what you want for a smooth transition to the tweeter. I am planning on doing this myself, crossing 2 x Neo10 -side-by-side to a TPL-150H in a MT arrangement around 1.5-2kHz (wherever measurements will show that the two Neo10 is down -6dB at 80 degrees horizontally to match the dispersion of the waveguide).

Two will of course give greater output (sensitivity) and better low-end extension due to mutual coupling.
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Old 24th March 2014, 03:14 PM   #8
Face is offline Face  United States
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Quote:
Originally Posted by InOtIn View Post
This may be exactly what you want for a smooth transition to the tweeter. I am planning on doing this myself, crossing 2 x Neo10 -side-by-side to a TPL-150H in a MT arrangement around 1.5-2kHz (wherever measurements will show that the two Neo10 is down -6dB at 80 degrees horizontally to match the dispersion of the waveguide).

Two will of course give greater output (sensitivity) and better low-end extension due to mutual coupling.
Sounds like an interesting build, I'd like to see more on it.
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Old 24th March 2014, 05:27 PM   #9
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Not built yet but the concept will basically be like this:

Click the image to open in full size.

Approximate crossover points:

+ Neo10: 300-1,800 Hz
+ TPL-150H: 1,800-20,000 Hz
+ 12P80Nd: 90-300 Hz
+ Dipole18: 27-90 Hz (in H-frame).

Main weakness will be the loss of dipole CD from about 500 Hz and above...
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Old 24th March 2014, 11:55 PM   #10
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My design is a large bookshelf (>27" tall) 3-way augmented passive radiator design with a Vifa NE225W-08 8" woofer and something like the Aurum Cantus AST25120 tweeter and a pair of Neo10s with crossovers points at about 250-280 hz and around 2-4KHz.

According to Brian, all his designs were first order and had a x-over for the mid at around 280Hz. I'm being overly cautious with my design using a pair of mids each.

The other reason for not wanting to go with 4th order crossovers is that it would literally double the cost of the speakers.

InOtIn, that does look like a fun design.
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