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why no sEALed fEARfuls???

#142
billfitzmaurice said:
It bears no resemblance to a transmission line whatsoever. Part of your confusion might stem from the fact that the majority of so-called transmission lines are not.
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Then the same goes for your assumption that an (fully)open-back cabinet resembles a bassreflex system. A fully open-back is just an open-baffle with a certain cut-off frequency depending on the distance between the drivers direct sound and the sound from the back. Which in fact has more resemblance to a transmissionline (depends on the cab depth and width) then a cab with helmholzresonator.
 
#147
It's a thrown together diy job....the amp is a bassman. It's wide open side to side. The whole thing is 18" high. The slot is 12-13"high so there's 2-3" covered top and bottom just for sturdyness and to have a place to mount the jack. Can also throw pedals in there and they don't fall out. I had no idea I was making a port....or a T-line....or anything else other than something to keep the speakers from rolling around on the floor. :)
 
#148
Arjank said:
Then the same goes for your assumption that an (fully)open-back cabinet resembles a bassreflex system. A fully open-back is just an open-baffle with a certain cut-off frequency depending on the distance between the drivers direct sound and the sound from the back. Which in fact has more resemblance to a transmissionline (depends on the cab depth and width) then a cab with helmholzresonator.
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Refer to G.A. Augsperger's definitive work on transmission lines, published in the Journal of the AES. Transmission lines and open back or OB cabs share no characteristics. A fully open back operates as an OB of course, but few 'open back' guitar or bass combos are truly open back. Determining whether or not a cab operates as a VB or OB is simple, a VB will show a secondary impedance peak above Fb, an OB will not. The secondary impedance peak with most open back cabs is very small, often only a few ohms higher than the driver raw impedance, but it is there.
 
#149
kraigo said:
In addition to RPSands' response, nobody in bassdom is making 500 cabs a day.

KO
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Correct.

My experience is with a full range of loudspeaker enclosures; PA, guitar, bass, and otherwise. 500 units on 2 assembly lines working 10's isn't out of the question when there are no issues.

Sorry about the cheeseburger analogy fail. I knew it was, but I went with it anyway.:D I just find it odd that 50 years later the most popular amps, cars, and guitars are all from the same era.
 
#150
kringle77 said:
Sealed cab designs.
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Companies like Eminence have reference cabinet designs right on the page with each driver
Speaker Detail | Eminence Speaker

Sealed is not an option for their top of the line drivers like used in the fEarful

You will find sealed reference designs on their bass only drivers. It's pretty much throw a driver in a box, and here's what happens at different size boxes.

If you're going build a box, might as well build the best cabinet for the driver, as this is what the manufacturer recommends.
 
#151
Sealed 3015LF in a 2.5cf net (probably 3cf before stuffing and driver displacement and bracing and handles) box and a couple mod50-10's vertically above that. Passive crossover is the real work there, it'd be very challenging and expensive and heavy. :)
 
#152
kringle77 said:
Sealed cab designs.
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If there ever was a bass cab perfect for a first time DIY'er without the aid of a design or knowledge to design one, it would be a sealed cab with a driver meant for one.

A lot more forgiving of the "throw a speaker in a box" build variety. Note that I didn't say it would be perfect...just a lot easier to do.

Buy any speaker good for sealed cabs and build a box for it. Hard to screw it up too bad even if you don't know what you are doing.
 
#153
I think it's amusing how long this thread went on when the question was answered so quickly (Why no sealed fEarfuls? Because the fEarful designs are built around the 3015LF and 3012LF drivers for the lows and those are designed to be used in ported cabs).

Interesting discussion of ported/sealed/etc. though.

My next cab project is probably going to be a sealed design, but then again, it's also going to be strictly a guitar cab, so there ya go.

Speaking of which, it seems there are very few ported guitar cabs in the same manner as ported bass cabs (lots of open back guitar cabs, but that's not really the same thing). From the discussion, my guess is because the difference in the roll-off of the lows between sealed and ported cabs is below the frequencies guitar cabs really need to produce?
 
#154
They're an octave above a bass so fundamental is 82hz and the power is at 164.

Maybe a market for downtuned metal guys but I'd think it'd be way too woofy for regular stuff plus the cabs would have to be bigger or have less speakers in them and that wouldn't be cool.
 
#155
Genz makes a ported guitar cabinet that sounds better than any other cabinet I've ever heard, period. Absolutely what I would use, regardless of tuning. It's got an epic tone.

El Diablo 60 and that ported cab on its side...could probably make my guitar playing palatable ;)
 
#158
will33 said:
They're an octave above a bass so fundamental is 82hz and the power is at 164.

Maybe a market for downtuned metal guys but I'd think it'd be way too woofy for regular stuff plus the cabs would have to be bigger or have less speakers in them and that wouldn't be cool.
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Indeed so.

Maybe a market for the downtuned metal stuff, yeah, but it really depends on what said metallers are into. Lots of those who tune really low are into really vintage-y sounds.
 

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