Need to replace a 12" bass cab speaker... What one do i get

[Steve Conner]

I believe this is simply a 6th order resonator as opposed to the usual 4th order. It will go down lower, but roll off at 36dB/octave when it finally does run out of steam.

I wonder if it would help the EVM12L's "thin" bass.

[RudeBoy]

I believe this is simply a 6th order resonator as opposed to the usual 4th order. It will go down lower, but roll off at 36dB/octave when it finally does run out of steam.

I wonder if it would help the EVM12L's "thin" bass.

WinISD v 0.7 will model a 6th order bandpass enclosure. There are no built-in alignments so its sort of a cut-and-try approach.

[Steve Conner]

Yep, but this is a 6th order highpass.

[RudeBoy]

Yep, but this is a 6th order highpass.

Ohh look at that! My lazy eyes saw something else. I couldn't begin to model it.

[blindboybenton]

Maybe an Eminence Beta 12 or Celestion Truvox? They're not too expensive general purpose 12" drivers rated at about 150W.

Geezer Butler famously used the EVM12L in his bass cabinets. But it's expensive and can sound a bit too "thin" and "tight" in some cabinets due to its high motor strength. The Eminence Delta Pro 12 is similar but cheaper.

There is some truth in the saying that a speaker sounds best when pushed near its maximum power. The higher the power the speaker is designed for, the bigger and heavier the voice coil will be. The extra weight tends to lower the sensitivity and dull the treble output. So you don't want to be using a voice coil any bigger than necessary to handle your amp's output power.

I Brought the Eminence Beta 12 off ebay.. so ill see what it sounds like

BBB

[Leo_Gnardo]

That "double chamber reflex" was covered in a Speaker Builder article @ 1985. In a subsequent issue SB warned readers that they had been contacted by Bose legal beagles because this design supposedly was covered by a Bose patent - so go ahead & build yourself one and one only! Or else go to Bose jail. Now 28 years later that patent is worth the paper it was printed on so full speed ahead with the dual chamber cabs & no fear of the Bose Police. For those who want to do that sort of thing.

Let us know how you like your Eminence Beta, BBB.

I was going to suggest Em's Kappa Pro - I've used 'em and very satisfactory they are. Also practically bulletproof.

[loudthud]

I don't think the Bose suit was for the article that appeared in SB issue #3 from 1980. There was a later article about a three way PA system that used a 6th order bandpasss sub-woofer, an EVM12L in a short horn enclosure and a compression driver for the highs. The software I have from Eminence warns you that the 6th order bandpass is covered by a Bose patent. In the diyAudio thread, the argument is made that the double chamber reflex is not a 6th order bandpass as in the Bose patent.

What ever happened to that Bose system for performing musicians where each musician had this speaker that looked like a short flag pole and cost outrageous money?

[Leo_Gnardo]

I don't think the Bose suit was for the article that appeared in SB issue #3 from 1980. There was a later article about a three way PA system that used a 6th order bandpasss sub-woofer, an EVM12L in a short horn enclosure and a compression driver for the highs. The software I have from Eminence warns you that the 6th order bandpass is covered by a Bose patent. In the diyAudio thread, the argument is made that the double chamber reflex is not a 6th order bandpass as in the Bose patent.

What ever happened to that Bose system for performing musicians where each musician had this speaker that looked like a short flag pole and cost outrageous money?

I'd have to snoop thru my dusty pile of old SB's (and I know right where they are) but IIRC there wasn't any suit, just a warning letter. And we're way way past the sunset on Bose's patent. I'm not about to build any, but if anybody was, I'd say don't sweat the Bose Police.

Those Bose PA speakers were supposed to be the bees knees BUT as an old sound guy I knew there was a limit to how much you could get - gain before feedback - and it turns out they work OK at modest volumes but sure can't drive anybody deaf. That's no fun. Plus they're dipole radiators - just as much sound comes out the back as the front. So that limits your gain before feedback somethin' fierce. I have seen/heard them in use at a church my cousin & her husband attend in the Boston suburbs. They sound OK - non offensive - that is to say smooth. And they project decently into the church hall which seats @ 200-250. But they're also pretty well smothered by the time the congregation starts to sing along. For folkies, lite jazz & pop-rock, playing at a small club, might be a choice. I think I like the old Bose 800 (?) better. Similar to the 901 but moulded plastic cabs and 8 speakers not 9. Used to see a pair of those set up one on each side of Keith Moon's head. Imagine what kind of volume it took to get thru.

[loudthud]

A good friend of mine had a pair of 801s and another pair he built. Drove them with a Crown DC300 and they did ok. Very clear sounding when mounted on stands. But they were no match for my pair of bi-amped Altec A7s as far as shear volume.

I think this is the Bose patent US 4549631: Multiple porting loudspeaker systems - Bose Corporation

I found some Bose patents that reference the Augspurger article from 1961.

[Leo_Gnardo]

A good friend of mine had a pair of 801s and another pair he built. Drove them with a Crown DC300 and they did ok. Very clear sounding when mounted on stands. But they were no match for my pair of bi-amped Altec A7s as far as shear volume.

I hear THAT! and with more bandwidth too.

Never got into Boses. Ran across some replacement speakers though - kinda weird. Meant for 901/801, they were 1 ohm voice coils (?!?), must have 8 or 9 in series, depending. Can anybody verify this? Seems bizarre to me, but that's Bose.

Local speaker builder made Bose-like wedge monitors a long long time ago. 12 small cones with 4 tweeters along the diagonal for 4x4 appearance on the baffle. Supposedly they were used by Janis Joplin, later turned up in the house system at Bearsville Theater. Can't say I was thrilled with the sound. How about - unimpressed. Give me a 12+horn any day, or 15 even better.

[blindboybenton]

Hi all

Just to say i used my new speaker cab last week. Very pleased with the Eminence Beta. I had to use my back up amp as the valve amp i use is playing up. Solid state !! but with the 2 x 10" and 1 x 12" was very impressed with the sound. Great size cab and with me being on the 2 nd floor light to carry up and down again

BBB