If I were to build a line array of 12 of these:
DAYTON ND20FA-6 3/4" NEODYMIUM DOME TWEETER
Specifications: *Power handling: 15 watts RMS/30 watts max *VCdia: 3/4" *Impedance: 6 ohms *Re: 5.2 ohms *Frequency range: 3,500 - 25,000 Hz *Fs: 1,800 Hz *SPL: 92 dB 2.83V/1m *Dimensions: A: 1-3/4", B: 1-5/16", C: 3/4".
And, 12 of these:
DAYTON DA135-8 5-1/4" ALUMINUM CONE WOOFER
Specifications: *Power handling: 30 watts RMS/50 watts max *VCdia: 1" *Le: .9 mH *Znom: 8 ohms *Re: 6.15 ohms *Frequency range: 50-15,000 Hz *Fs: 53 Hz *SPL: 85 dB 1W/1m *Vas: .25 cu. ft. *Qms: 2.40 *Qes: .57 *Qts: .46 *Xmax 3 mm *Dimensions: Overall Diameter: 5-5/16", Cutout Diameter: 4-1/2", Mounting Depth: 2-1/2"
What would be a logical crossover point? I am new to crossovers, having dabbled only with full range single drivers.
DAYTON ND20FA-6 3/4" NEODYMIUM DOME TWEETER
Specifications: *Power handling: 15 watts RMS/30 watts max *VCdia: 3/4" *Impedance: 6 ohms *Re: 5.2 ohms *Frequency range: 3,500 - 25,000 Hz *Fs: 1,800 Hz *SPL: 92 dB 2.83V/1m *Dimensions: A: 1-3/4", B: 1-5/16", C: 3/4".
And, 12 of these:
DAYTON DA135-8 5-1/4" ALUMINUM CONE WOOFER
Specifications: *Power handling: 30 watts RMS/50 watts max *VCdia: 1" *Le: .9 mH *Znom: 8 ohms *Re: 6.15 ohms *Frequency range: 50-15,000 Hz *Fs: 53 Hz *SPL: 85 dB 1W/1m *Vas: .25 cu. ft. *Qms: 2.40 *Qes: .57 *Qts: .46 *Xmax 3 mm *Dimensions: Overall Diameter: 5-5/16", Cutout Diameter: 4-1/2", Mounting Depth: 2-1/2"
What would be a logical crossover point? I am new to crossovers, having dabbled only with full range single drivers.
It sure looks like the efficiency of those Dayton neo's have got the woofers a little overpowered. I just am woking with some of those tweets now and trying to chill them out a little.
Anyway, 12 of those tweets don't make an array. You could do better with two ribbons at sitting and standing levels.
Look for a proven design. I don't think those two drivers are well matched.
Anyway, 12 of those tweets don't make an array. You could do better with two ribbons at sitting and standing levels.
Look for a proven design. I don't think those two drivers are well matched.
Thanks, I am just playing around with combinations at the moment.
Proven designs are great, but am in interested in learning through experience (translate "mistakes") so....
Proven designs are great, but am in interested in learning through experience (translate "mistakes") so....
There are some pretty decent tweeters out there that won't leave you ith a pile of stuff if it doesn't work out. BG Neo8 would be a great start for the line. You can push the crossover lower with it's response.
Further, the efficiency of the woofer choice is really low at 85dB. Consider something in more of a midbass and smaller diameter.
Just an opinion...
Further, the efficiency of the woofer choice is really low at 85dB. Consider something in more of a midbass and smaller diameter.
Just an opinion...
Yeah, regarding efficiency of the woofers, using JG's formula in his paper, with 12 of them I would be at about 96. This is fine with me.
As for the tweeter, well I am not wedded to anything at this point except for an inexpensive price. Perhaps I can spend 40 clams a pop for tweeters down the line, but I would rather spend 4 at this point and see what I can do with them. Same with the woofers, at this point.
And, oops, I was paying attention to the woofer height, not the tweeter. It would take maybe...36 of them per side.
Eh, I will keep playing with cheap combinations.
But, you never answered my question. Where would you cross those over? High or low?
As for the tweeter, well I am not wedded to anything at this point except for an inexpensive price. Perhaps I can spend 40 clams a pop for tweeters down the line, but I would rather spend 4 at this point and see what I can do with them. Same with the woofers, at this point.
And, oops, I was paying attention to the woofer height, not the tweeter. It would take maybe...36 of them per side.
Eh, I will keep playing with cheap combinations.
But, you never answered my question. Where would you cross those over? High or low?
Mr. Griffin would recomment that the lower the better to avoid combing. You should read his paper.
I haver crossed both of my line arrays in the 4-5kHz range. That would be high. With the Neo8, my next line will be pushed down top 2250 or so. That would be a sweet spot for a 4" woofer to avoid combing.
www.audiodiycentral.com/resource/pdf/nflawp.pdf
I haver crossed both of my line arrays in the 4-5kHz range. That would be high. With the Neo8, my next line will be pushed down top 2250 or so. That would be a sweet spot for a 4" woofer to avoid combing.
www.audiodiycentral.com/resource/pdf/nflawp.pdf
Thank. I've read the paper. Answers a lot of question for me; brings up lots of questions for me.
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