03-03-2013 04:48 PM - edited 03-03-2013 04:51 PM
so I bought this for $30
and for a 2x10 cab from a repurposed PA cab [I assume] it is just fine. The ports for whatever/tweeter are just empty space now
I poped the back jack plate off before I realzied it was a front mount speaker set up. So i slipped my phone in to snap some speaker back pics:
and I have seen no name square magnet speakers in old cabs before... usually they sound not too bad, but this thin black magnet with the cab sawdust on it in the foreground is something I have not run across... looked almost waxy. and the front:
the front of the square magnet one^
and the one I am confused about ^ with a really shallow cone and wide middle part. anyone see something like this? is this still a PA speaker? I was thinking of doing one 10" guitar speaker and one 10" bass speaker in this thing... but seeing this weird speaker has me looking for indentification before I take a next step.
03-03-2013 05:32 PM
Are there any numbers on the frames of the speakers? I can't see them in the pics, but they might be on the portions we can't see. It looks like the rims are front-mounted... you might have to take them off to see the numbers. Once visible, I can give you a manufacturer and date-made.
03-03-2013 06:21 PM
03-03-2013 09:17 PM
Actually my speakers have a cone to center ratio similar to that and they're awesome.
Celestion G12-65s. However, those speakers are not the same as that one so who knows. Does it sound good? If so, no problem.
03-03-2013 10:13 PM - edited 03-03-2013 10:15 PM
The "cone to center ratio" thing is just a part of the speaker called the dust cap. It really doesn't matter if it's large or small, at least insofar as determining if it was a PA speaker or not originally. Same with the large "flat" magnet. That's also not terribly uncommon on both guitar and PA speakers.
The best way of determining what you have is to pull each speaker out, and write down whatever codes you can find that are stamped or otherwise marked on them. From that, we can determine the manufacturer of the speaker, and go from there.
03-05-2013 05:14 AM
03-05-2013 05:58 AM - edited 03-05-2013 05:59 AM
The dust cap size and weight affects the frequency response of the speaker. It can serve as a mid-, high-frequency radiator. So, the smaller and lighter the dust cap is, the more extended the high end frequency response. Larger, heavier dustcaps acutally lower the driver resonance by sheer mass. Subwoofers tend to be all dustcap and very little cone. This is all subtle though and dependent on a lot of other factors.
The striations on the outer edge are there to allow the cone to move freely.
Anyway, I'm betting that bottom speaker is just some budget PA/stereo woofer with the label removed. If you Google "10in raw speaker" you'll probably find similiar stuff.
03-05-2013 08:07 AM
so here are some pics. the square magnet one only had a stamp on the cone and a red blurb
and the other one had a label and cone stamp. neither had anything on the rims. this one was WAY heavier than the square wave one
03-05-2013 08:12 AM
03-05-2013 12:28 PM
03-05-2013 01:01 PM
03-05-2013 01:06 PM - edited 03-05-2013 01:10 PM
In another lifetime, I was a Sunn authorized warranty repairman. I can't tell you who made those speakers for them, but I can tell you that Sunn used those two speakers in many products. Mostly I saw the one with the smaller magnet in their closed guitar cabinets and the one with the larger magnet in their open backed combo amps, which makes sense.
It seems unlikely that that Sunn cab started out with two different speakers in it. Most likely it started out with two speaks with the smaller mags since the cabinet is closed except for the port. Closed cabinets limit excursion so a smaller magnet structure can work. Possibly someone replaced one of the speakers with another Sunn speaker that was intended for open back cabs.
03-05-2013 01:12 PM
oh and i tried to get an ohm reading for bothg speakers and it really didnt settle with my DMM at all... the closest i could say was 16ohm which is weird since 1 speaker clearly says 8 ohms
DC resistance isn't the same as impedance. Typically the speakers should show DC resistance on your meter which is considerably lower than that the marked impedance on the speaker.
03-05-2013 01:50 PM
Yup they already email back and said it was a pa speaker they made about a decade ago for an outside supplier...
So being a pa speaker, it would be closer to a bass voiced speaker then guitar, right?
That entirely depends on the specific model. There are "PA speakers" that are voiced for various different frequency ranges... not all of the 12" "PA speakers" are designed for lows / low mid reproduction, or full range reproduction. Some are targeted just at the mids, or just the lows. See if Eminence can supply you with any of the technical info on that particular speaker, or its specifications. That would let you know a lot more about it, and give you a much better idea of whether or not it is suitable for guitar duties. Typically, guitar speakers have a usable frequency range of about 80 Hz to 6 kHz. A bass driver that was designed for a PA cabinet might only run from 30 or 40 Hz to 300 Hz... it just depends on the speaker, and what they were trying to achieve.
03-07-2013 08:07 AM
03-08-2013 06:36 AM
I'm guessing it's also an Eminence just because it has the same cone stamp and red dot as the other.
the confirmed eminence has no red stamp, you must be looking at the pics out of order
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