Midrange Experience

[kerrystansbury]

I am going to buy 18 sounds 10NDA610 Midrange driver for my 4 way system (2x Aura NRT18-8 18" subs, 2x 18 Sound 15LW1401 15" upper bass, 10NDA610 10" mid, Radian 465PB 1" horn).
I am trying to decide which mid configuration would be best, 2x 10" mids or a single 10" driver with a DDS DMB10NPRO horn lense. A single mid without the lense will not be loud enough to keep up with the rest of the system. Here is a link to the specs for the DDS.
http://www.ddshorns.com/catalog.php?page=DMB10NPro

I will be using a DDS CFD 1-90 Pro horn lense on my 1" horn or a DDS CFD 2-60A Pro lense with a P.Audio Y adaptor and 2x 1" horns for the high frequencies. Both are also on the previous listed DDS websight.
I would also like to know what people think of BassBox Pro (version 6.0.15 Pro) speaker deisgn software. Is it accurate on the bottom end and the high frequency end of the response curve? It show that the 18 Sound 10 listed above has a better high frequency response than the 8" 8M400, which is 18 Sounds other midrange.
One more thing, I would like to X-over to the 15's around 250 hz. should I use a sealed cabinet or ported. I like the Idea of ported for a flatter response and better cooling of the driver.

Thanks, Kerry

[Brett]

Is this for home or PA?

A single 10NDA will be more than enough domestically, even for a large theatre room. I speak from experience: a similar JBL2123 goes incredibly loud when used as a mid.
For home use, with a single 10, I would go with the ENG90. For MTM (how I'm doing it) I'm using JBL PT waveguides (90x40) which are $US10 ea.
Econowave thread

You do not need 2x1" drivers or flares.

BB will be fine for modelling the LF, 250Hz is a good starting point for the MB/MF xover and I'd run both the 10 and the 15 sealed.

[kerrystansbury]

This is for both PA and home watching live concerts on a 10 foot screen. at home my Rec room is 40 x 60 ft. with a 10.5 foot ceiling. Many times this system is used outdoors. I presently am using two Madison 8" knight mids (info below) powered with 1200 watts into each pair, and I am clipping the amp. My 18's and 15's are each powered with 2400 watts to each pair per side. The systems total wattage at present is 10,000 watts. I plan to double that so I will be running 20,000 watts, 10,000 per side (2 channel system). The midrange on each side will have to keep up with a pair of the 18 sound 15LW1401's powered with 4000 watts and a pair of the Aura's powered with the same. Once in awhile the system will be used for live performance and someone abusing the microphone. I am at this forum because the Pro audio forums aren't much about high fidelity.
The bassbox shows the 10" high freq. extends higher than the 8", is that accurate?
The 15's cannot keep up with the 18's without a ported enclosure.

Model Knight 8
FS 90hz
VAS (cu.ft) 0.15
SD 38.484
Qts 0.683
Qes 0.812
Qms 4.313
BL 47.57
Re 5.3
Nominal Ohms 8
Le 232.92u H
Mms 64
X max 0.25
X mech 0.5
SPL 95db
Freq.Res. 80-8000hz
Cone type treated paper
basket type cast aluminum
Magnet size 30oz.
Power RMS 200 watts
Power Peak 400 watts

Thanks, Kerry

[tinitus]

Originally posted by kerrystansbury


The 15's cannot keep up with the 18's without a ported enclosure.


Thanks, Kerry

Why do you think that
And you even plan on double 15"

But porting a mid/midbass wont be high fidelity

It seems like you havent realised the difficulties you are facing

But if you want a good speaker fore home, build that

If you want a PA speaker its different, and maybe even a cheap 2way would do...or maybe even a 2way active

I wouldnt do both in one, unless you were very young and could use a PA speaker fore home as well...I have actually heard that work nicely

[pos]

Hi Kerry

Take a look at Drew Daniel's system:
http://www.audioheritage.org/html/pe...s/1-intro.html

It is in line with what you want to achieve.
The mid (2123H) is not horn loaded

[kerrystansbury]

Drew's system is interesting, but with the low power of the BGW amps, I can see why the single mid is acceptable, especially if you're not really cranking it up. The JBL 2450 without a tweeter is not acceptable for high fidelity. it rolls off drastically at the high end and a EQ cannot fix that much roll off. Also, a 15" in a sealed cabinet will be way beyond X-max at it's lower frequencies. It will x-over to the 18's around 40hz.

Kerry

[pos]

Originally posted by kerrystansbury
Drew's system is interesting, but with the low power of the BGW amps, I can see why the single mid is acceptable, especially if you're not really cranking it up.

He didn't choose to horn load the mid either, so maybe he had enough power to produce the SPL he was aiming.

Drew says his system was used at Disney for a show with 2500 people, so I think it should be loud enough for garden parties

[Brett]

Based upon your comments, you have no idea what you are talking about.

[pos]

Originally posted by Brett
Based upon your comments, you have no idea what you are talking about.

Is this for me?

[tinitus]

Originally posted by pos

Is this for me?

It would probably count fore all of us

I have been through considering all thats suggested here, and concluded that the one below would be preferred, maybe
I fear that most of what I consider as quality sound would be lost due to the complication of design, but it sure as hell would play loud
Now I have decided to build a DIY planar system instead, and not play so loud