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LDS Sealed 15/8

#181
I've heard several cabs using the 18sound and they all had the harshness to them. If I like this 4015lf/pr150 combo, I may want to go ahead and have a dual version built. If one mid is enough to keep up, I'd do a tall thin cab. If it need two mids then, Im not sure. You would need an nv type of cab with heigth and width to match. But, at those dimensions, the cab would have to be pretty shallow to tune properly. That would be pretty tippy. Dual woofers and mids stacked vertical would be way to tall and thin. The only thing I can think of would be to crossfire a pair of mids at 120 degrees like BFM's guitar cab design. The only thing that bothers me about that is that the mids would be sitting back further in the cab and the top piece of plywood on the cab would be blocking the vertical dispersion. Like putting a roof over the mids so to speak. I know that one higher efficiency mid would be the best way but, I've never heard one that I liked the sound of with that kind of efficiency.
 
#183
It´s all guesswork before the sawdust is actually made, you can never be 100% sure how things will turn out.
I´m sure that two 4015 lf´s with 18 sound mid would sound VERY different than fearful or any simillar design, not just in low end of the spectrum (obviously) but through the mids too.

Thing is all those designs use 1 mid per woofer ratio and they are intended to present the whole spectrum equally, from lows to highs what some don´t prefer so an amp with better than average eq capabilities is welcomed.

I don´t think that 18 sound mid would ever have a chance to stand out when coupled with a pair of those monsters.
Solutions to tame it if needed are either to pad it at crossover or to place it a´la NV215 between woofers, thus further from the ear.
 
#184
The a pair of 4015 drivers should be pretty even across it's useable range at around 99db. That 18sound is around 102 and the pr150 is roughly 100db with a dip at around 2khz. My current lds cabs woofer sits near 97db at it's x-over point and the mod8 averages 97-98db. I only have that turned up to about 9:00 on the attenuator and never more than half way up. I really does depend on the mix of components and not always the specs.

I tried crossfiring a pair of mod8's. I crossfired at 90 and 120 degrees. They had a space between them that was roughly 6" so the test was not perfect. I really prefered the sound with a 120 degree angle. It was very even as I walked around my basement. The 90 degree had more peeks and dips in the sound. Im not sure how much the space between the drivers effected the outcome but, now I would feel pretty comfortable using a pair of mids side by side but, facing inwards at a 120 degree angle. Really sounded good. Just using one mod8 of course had the most even sound the gradually increased and decreased the clarity as I walked from one side of the basement to the other but, the pair facing in was stronger sounding everywhere so, I think it sounded superior. I'd love to you hear from someone who has done something similar and gigged with it. If the pr150 doesn't work out, I'd feel very comfortable using a pair of mod8's.
 
#187
Got to play around with the pr150 tonight. A very nice mid for sure. Maybe alittle too nice. I prefer it to the mod at the crossover point, it's more full sounding. I think that I still prefer the mod8 because it is more guitar-like. Im thinking that the 4015lf crossed to a mod8 at 1khz could work really well. That bump from 800 to 1k on the 15" actually looks like it will match up well with the 8" and fill in the 8" dip in the 800hz range. I'll try out the 4015 on friday and use my eminence 800hz crossover for now.

I put alittle extra stuffing in the woofer chamber and it seemed to clean up the sound a bit but removed some of the lows. I'll leave it in for the 4015 to hopefully simulate a larger chamber.
 
#188
The Faital 8FE200 also looks like it would match well with the 4015LF. It's 130 watts with a ferrite magnet and peaks and valleys which should complement the 4015LF in the crossover region (bump vs dip at 450 Hz and dip vs bump at 850). Its about 95dB at 1kHz, rises to average about 98dB between 2.5 - 5kHz, and only costs $60.
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It seems to be advertised as having a more traditional sound.
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#189
I was thinking about it and by stuffing the exta foam into the woofer chamber, I didn't reduce the low end, I probably just smoothed out any low mid hump. So, it would "sound" alitte more quiet down low. I'll probably have to keep the foam in for the same reason when I try the 4015lf.
 
#190
Got the 4015lf today. First of all, this thing puts out alot of low end and handles alot of power. Second, just as I thought, my cab is alittle to small for this driver. So, Im going to see if I can return it. No surprise, the drivers that the cab was designed around works better. It also reminds me that I really don't use much real low end in my sound and why the fearful cabs weren't for me. So, after a bunch of brainstorming, my little 158 still has the mojo, if not the power handling.
 
#195
The amount of xmax has less to do with it than the end Q of the system after stuffing combined with the driver Q, would be my guess.

You might also like the sound of woofers overdriving just a little but I'm guessing it's more the character of the lows/upper bass/low mids you're hearing, which is more to do with Q than Xmax.
 
#196
I think you are right on about all of that. I'd like to know even more about it than I do but, I'd just end up building piles of cabs for experiments and not actually playing my bass, or going to work, or seeing the wife, etc....;) I owned a bergantino ae212 for a very short period. Didn't really like it. Plugged the ports and then I liked it but, then wanted a mid instead of the tweet. I probably just need a pair of 8 ohm thunderchild TC115 cabs, if they ever come out. That TC112 sounded pretty good with the ports plugged. Still sounded like a 12" though.
 

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