The lower limit will be set by how low you can get the resonance. The 8M has a normal Fs of about 100Hz. The air mass load within the horn will lower it some. How much I do not know, it depends on your horn. The type and size of the horn will determine how low Fs will be shifted. I don't think much of anything below 90Hz would be achievable with any kind of sound quality. I would probably not waste a 8M on a limited bandwidth of 90Hz - 400Hz. Almost any other 8" woofer can do that.
Rgs, JLH
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Yes, not your typical "horn driver" parameters. Now everyone should understand why so many people have turned their nose up once they see the T/S parameters. They don't fit into what most of us would call good horn loading specs. Most people see a Qes over 0.25 or a BL factor below 10 and automatically think its no good for horn loading. You can't judge a woofer just by it specs sometimes.
Rgs, JLH
I was warned off having compression too high, but if JLH has used 2.7 to success that gives a good starting point for me.
Today I gathered 90% of the parts for my mother of a wood lathe and soon I will be able to build then test for myself.
Today I gathered 90% of the parts for my mother of a wood lathe and soon I will be able to build then test for myself.
Attachments
I remember reading an old thread =where Romy comments that the 5M and 10M are no comparison.
HA HA i was laughing to myself about that just minutes ago.
I have sim'd in a 160 HZ Le Clec'h as well as that is what I was initially going for.
The upper horns will be Le Cleac'h ;-)
Sorry Lars, is a 90 degree Le Cleac'h where it stops at 90 degrees instead of the 180 shown in Hornresp or the full profile obtained using the Le Cleac'h spreadsheet?
I have sim'd in a 160 HZ Le Clec'h as well as that is what I was initially going for.
The upper horns will be Le Cleac'h ;-)
Sorry Lars, is a 90 degree Le Cleac'h where it stops at 90 degrees instead of the 180 shown in Hornresp or the full profile obtained using the Le Cleac'h spreadsheet?
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I remember reading an old thread =where Romy comments that the 5M and 10M are no comparison.
The 5M is nothing like the 8M. Don't even waste your time with it. If you want to use a 5", then look at the Faital M5N12-80. However, I would choose the 8M over all others.
Rgs, JLH
Depends on your system balance. If you run a lot of digital material then the Faital can be your friend. It is more laid back, but lacks the detail and punch of the Fane. It also doesn't go as high in frequency as the Fane. If your system is neutral or soft, the Fane is best. If you have an overly bright system, then the Faital will soften it up. Generally I feel like I want the best drivers and tune to them. However, if you are stuck with a bright system and can't make the changes you want, the Faital can be useful.
Rgs, JLH
With all this love for the 8M.. I a bit surprised that the 18sound 6ND410 isn't mentioned:
Frequency Response - drivervault
It also has a rising response, and is more efficient overall. It doesn't have the mass of the 8m - so air compression won't be as tactile, but with it's low mass it should have greater detail. While it's fs isn't nearly as low, it has a higher Qts. I guess then it all depends on how much pressure you want below "cutoff".
Frequency Response - drivervault
It also has a rising response, and is more efficient overall. It doesn't have the mass of the 8m - so air compression won't be as tactile, but with it's low mass it should have greater detail. While it's fs isn't nearly as low, it has a higher Qts. I guess then it all depends on how much pressure you want below "cutoff".
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Gregg
Both those responses look excellent . The horns are also massive ! - but if you have the space and the patience to build them , so be it. You may have trouble actually MOVING the horn if you build in MDF though .
Meanwhile, I'm trying to finalise a much more compromised hyperbolic horn for the Fane driver. I'm working with about 85 to 90cm length and a mouth of ~3500cm^2 . My room is not so big !
Now , the response is pretty good ( with JLH's measured data particularly ) and gives me ~120 to 1000Hz fine ( I'll be crossing at ~700 ) . As expected, the level of colouration / ripple is of some concern . I will in any case build ONE of these horns and evaluate, because going to a bigger tractrix horn will be difficult without major changes to the furniture/layout of the room .
I have therefore been playing around with the parameters on Hornresp to see what affects the ripple on the freq response. I find that the only parameter that makes much difference in the context of the Hyperbolic horn, is the throat diameter . The ripple drops usefully if I increase from 4" throat to 4.5" or 5" . So, this goes against the practical advice to choose 4" for the Fane .
Can any experienced builders comment on whether this effect is real, or just an artifact of Hornresp, maybe linked to any assumptions in the software . If it's real, what is the mechanism for the differences ?
I can quite easily build to 5" throat, and the efficiency is, in any case, plenty high-enough .
Cheers
Mark
Both those responses look excellent . The horns are also massive ! - but if you have the space and the patience to build them , so be it. You may have trouble actually MOVING the horn if you build in MDF though .
Meanwhile, I'm trying to finalise a much more compromised hyperbolic horn for the Fane driver. I'm working with about 85 to 90cm length and a mouth of ~3500cm^2 . My room is not so big !
Now , the response is pretty good ( with JLH's measured data particularly ) and gives me ~120 to 1000Hz fine ( I'll be crossing at ~700 ) . As expected, the level of colouration / ripple is of some concern . I will in any case build ONE of these horns and evaluate, because going to a bigger tractrix horn will be difficult without major changes to the furniture/layout of the room .
I have therefore been playing around with the parameters on Hornresp to see what affects the ripple on the freq response. I find that the only parameter that makes much difference in the context of the Hyperbolic horn, is the throat diameter . The ripple drops usefully if I increase from 4" throat to 4.5" or 5" . So, this goes against the practical advice to choose 4" for the Fane .
Can any experienced builders comment on whether this effect is real, or just an artifact of Hornresp, maybe linked to any assumptions in the software . If it's real, what is the mechanism for the differences ?
I can quite easily build to 5" throat, and the efficiency is, in any case, plenty high-enough .
Cheers
Mark
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