I'd like to build a modestly priced speaker with my son to compliment his low wattage single ended KT88 amp. Does anyone know of DIY designs based around the Eminence Legend B102? Can't be very large and must be >95dB. I know the Lore uses the speaker but he wants to build.
Thanks,
Jim
Thanks,
Jim
I am not sure about the Lore reference, is it a design, guitar or bass guitar cabinet.
I am sure you know eminence has loads of stuff for builds
https://www.eminence.com/pdf/Legend_B102_cab.pdf
The smallest bass guitar cab comes out at about 2 cuft and is ported.
For audio work you will need to cross it over to a very sensitive tweeter in a horn or compression driver with horn.
I am really guessing now at maybe 1.8Khz to 2 Khz crossover point for the bass driver to the horn. Others more experienced with horn arrangement will add their thoughts.
I am sure you know eminence has loads of stuff for builds
https://www.eminence.com/pdf/Legend_B102_cab.pdf
The smallest bass guitar cab comes out at about 2 cuft and is ported.
For audio work you will need to cross it over to a very sensitive tweeter in a horn or compression driver with horn.
I am really guessing now at maybe 1.8Khz to 2 Khz crossover point for the bass driver to the horn. Others more experienced with horn arrangement will add their thoughts.
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I ran it wide open with a single cap morel tweet.
Trying to run it up to 2khz was dispersion limited, as was the tweet
Couldn't do 45 degrees off axis which i need sitting 7' away.
Trying to run it up to 2khz was dispersion limited, as was the tweet
Couldn't do 45 degrees off axis which i need sitting 7' away.
Based on 90 degree dispersion, perhaps try crossing at 1.4khz.
Probably need a zobel (for a passive crossover) because impedence shoots up past 200hz.
Probably need a zobel (for a passive crossover) because impedence shoots up past 200hz.
This one?: Mini Lore - Tekton Design | Improve your hearing
If so, its 95 dB/W/m eff. must include room gain and likely measured mid band with the tweeter based on published BP102 specs, Hornresp
sim, so may/may not be this high due to his room's gain/speaker locations.
Please define 'large', i.e. why not just clone the Mini? Pretty sure it's just an empty box with minimal bracing, damping.
GM
If so, its 95 dB/W/m eff. must include room gain and likely measured mid band with the tweeter based on published BP102 specs, Hornresp
sim, so may/may not be this high due to his room's gain/speaker locations.
Please define 'large', i.e. why not just clone the Mini? Pretty sure it's just an empty box with minimal bracing, damping.
GM
You can't get 95db, but you might get 93, with a tail wind. The problem you will encounter is baffle step-loss. The B 102 is a pretty good "starter" driver, and well suited to a bass reflex. Zu speakers first started with this driver. You will need a net enclosure volume of (.707) (2.3) = 1.63 cubic feet. With emphasis on "net volume". You will have to figure out how to mate an appropriate tweeter.
With some though on construction details, you can plan for future additions. For example, to use a removable tweeter plate, such that you don't have to re-build the entire baffle board in the future. You will also want an *old-fashioned* style of enclosure, where it is wider than it is deep. By keeping it as wide as you can tolerate on an esthetic basis, the lower it will run before it encounters said baffle loss. If you also build it for dimensions to be placed on a (temporary) stand, and later on add dual opposed subs underneath it. Or, not. You could also place subs outboard in the future. Building an enclosure that is appropriate for both bass and mid-range is quite the difficult, but not impossible, task. Check out TNT Audio for enclosure construction tips.
Thanks for responses. I've changed my mind to do an econowave type 2 way. I really want to use a compression driver to get the efficiency. My son does not care for the "wide baffle" look but prefers the tower look so I realize I will have to compromise.
So what could I build to maximize efficiency if I switch gears to build a 2 way with a 12" woofer and compression driver/horn? I realize I'm being lazy but I appreciate the help.
Jim
So what could I build to maximize efficiency if I switch gears to build a 2 way with a 12" woofer and compression driver/horn? I realize I'm being lazy but I appreciate the help.
Jim
That is a Bass Guitar "Ampeg sound" woofer, I would not use it for any Hi Fi task.
Extend that to "Bass Guitar" use, way too muddy, absolutely unrelated to early Ampeg speakers which were way more defined in sound.
In a 2 way configuration, you will be left with a hole in the middle, it will drop before any reasonable tweeter can catch up.
If you want high efficiency, try one of the PA type ones instead, which are flatter and way more clear in sound.
Say some from the "Greek" series I(Alpha/Beta/Gamma/etc.)
Extend that to "Bass Guitar" use, way too muddy, absolutely unrelated to early Ampeg speakers which were way more defined in sound.
In a 2 way configuration, you will be left with a hole in the middle, it will drop before any reasonable tweeter can catch up.
If you want high efficiency, try one of the PA type ones instead, which are flatter and way more clear in sound.
Say some from the "Greek" series I(Alpha/Beta/Gamma/etc.)
I'd look at the diysoundgroup htm 12
$379 each, everything included.
Parts, you clamp and glue the box together, you solder the crossover.
You have to buy 2, but free shipping.
Denovo Home Theater Monitors
$379 each, everything included.
Parts, you clamp and glue the box together, you solder the crossover.
You have to buy 2, but free shipping.
Denovo Home Theater Monitors
Thank you Norman and Greg. I actually have been looking at that same kit from diysoundgroup as well as the offerings from Wayne to get a tested crossover design. I built one of the diysoundgroup kits years ago and was very unhappy with the harshness I heard from the Denovo compression driver they used at the time. Maybe the Celestion CD is better. I've been building for many years. My main system uses vintage JBL 2441s in Bruce's salad bowls (augmented w/Great Plains 15' in FLH and diy tapped horns for subs) so I know how a CD can sound. I realize this may not be a fair comparison.
The other issue is the width of the cabinet. the HTM12 is has a 18" wide front baffle and I wanted something as narrow as possible, but my son can't have his cake and eat it too!
I appreciate your help.
Jim D.
The other issue is the width of the cabinet. the HTM12 is has a 18" wide front baffle and I wanted something as narrow as possible, but my son can't have his cake and eat it too!
I appreciate your help.
Jim D.
For narrower baffle could do a 2.5way or 2 way with two smaller woofers (say 8"s maybe). The extra woofer acts as a baffle step buster and if paralleling 8ohm woofers for 4ohm you get an extra boost in sensitivity too if the amp will handle it. Seems like the Selenium D220TI with the B&C ME-10 is a nice compact combination for the tweet: B&C ME10 Hyperbolic Cosine Horn – AmpsLab
End result would be something similar to the klipsch tower designs I suspect. Though I don't know if there is a kit available using that design
End result would be something similar to the klipsch tower designs I suspect. Though I don't know if there is a kit available using that design
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