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Cab Speakers?

C

Cruzer23

Apr 24, 2026
32
4
#1
1000082078-jpg.7481357
Hi, was trying to work out what speakers are in a Mesa Boogie 4x10 Powerhouse 600w Cab. No labels other than to say made in USA. Assume they're 150w each. Cab from around the 2000's? Hand made in Petaluma California
 

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#2
First, the wiring was modified because the black-white pair should have been twisted together but while the white wire shows the original twisting, the black wire does not.

The very first thing to do is verify that the cabinet is correctly wired. (Most of the cabinets were 8 ohms, using a series-parallel combination of 8 ohm drivers)

Is there a nominal impedance stated on the driver?

Are they all the same driver... for the 8 ohm cabinet, they SHOULD all be 8 ohms but the one with the missing dustcap may be 4 ohms which may (depending on how wired) have received more power and because those drivers were not designed around extended bass, damaged the dust cap.

Those look like an early driver we used, possibly earliest of what became the Eminence Legend series. Does it have a #761058 stamped on the back of the magnet? I kind of doubt it because the surround doesn't match my data.

I would say no more than 150 watts each as a generality for driver of that era.
 
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#3
agedhorse said:
First, the wiring was modified because the black-white pair should have been twisted together but while the white wire shows the original twisting, the black wire does not.

The very first thing to do is verify that the cabinet is correctly wired. (Most of the cabinets were 8 ohms, using a series-parallel combination of 8 ohm drivers)

Is there a nominal impedance stated on the driver?

Are they all the same driver... for the 8 ohm cabinet, they SHOULD all be 8 ohms but the one with the missing dustcap may be 4 ohms which may (depending on how wired) have received more power and because those drivers were not designed around extended bass, damaged the dust cap.

Those look like an early driver we used, possibly earliest of what became the Eminence Legend series. Does it have a #761058 stamped on the back of the magnet? I kind of doubt it because the surround doesn't match my data.

I would say no more than 150 watts each as a generality for driver of that era.
Click to expand...
 

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#4
agedhorse said:
First, the wiring was modified because the black-white pair should have been twisted together but while the white wire shows the original twisting, the black wire does not.

The very first thing to do is verify that the cabinet is correctly wired. (Most of the cabinets were 8 ohms, using a series-parallel combination of 8 ohm drivers)

Is there a nominal impedance stated on the driver?

Are they all the same driver... for the 8 ohm cabinet, they SHOULD all be 8 ohms but the one with the missing dustcap may be 4 ohms which may (depending on how wired) have received more power and because those drivers were not designed around extended bass, damaged the dust cap.

Those look like an early driver we used, possibly earliest of what became the Eminence Legend series. Does it have a #761058 stamped on the back of the magnet? I kind of doubt it because the surround doesn't match my data.

I would say no more than 150 watts each as a generality for driver of that era.
Click to expand...
1000082113.jpg

Has a P.Audio tweeter
 
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#5
agedhorse said:
First, the wiring was modified because the black-white pair should have been twisted together but while the white wire shows the original twisting, the black wire does not.

The very first thing to do is verify that the cabinet is correctly wired. (Most of the cabinets were 8 ohms, using a series-parallel combination of 8 ohm drivers)

Is there a nominal impedance stated on the driver?

Are they all the same driver... for the 8 ohm cabinet, they SHOULD all be 8 ohms but the one with the missing dustcap may be 4 ohms which may (depending on how wired) have received more power and because those drivers were not designed around extended bass, damaged the dust cap.

Those look like an early driver we used, possibly earliest of what became the Eminence Legend series. Does it have a #761058 stamped on the back of the magnet? I kind of doubt it because the surround doesn't match my data.

I would say no more than 150 watts each as a generality for driver of that era.
Click to expand...
1000082093.jpg

Nothing on the speakers other than Made in USA. Was thinking the speaker have been swapped out at some point?
 
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#6
I can't read the numbers on the tag, that looks like a version of an early Eminence cast frame driver that ultimately became the Legend series metalwork. The numbers on the tag may include 761___ the first 2 digits should be 76. The cone numbers don't mean anything (for this purpose anyway).

That's an unvented motor used with a comp. paper dust cap. If they were driven beyond their mechanical rating, the dust cap could break the bond to the cone. This changed in later drivers.

I don't recall using a P-Audio HF driver, but it's quite possible that it was changed out at some time, or maybe it was a very early build prior to our later HF drivers.
 
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#7
agedhorse said:
I can't read the numbers on the tag, that looks like a version of an early Eminence cast frame driver that ultimately became the Legend series metalwork. The numbers on the tag may include 761___ the first 2 digits should be 76. The cone numbers don't mean anything (for this purpose anyway).

That's an unvented motor used with a comp. paper dust cap. If they were driven beyond their mechanical rating, the dust cap could break the bond to the cone. This changed in later drivers.

I don't recall using a P-Audio HF driver, but it's quite possible that it was changed out at some time, or maybe it was a very early build prior to our later HF drivers.
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1000082096.jpg

Speaker label, can't see anything else anywhere
 
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#8
Looking at that again, I think those may have been a PAS driver that we used until PAS exited the MI business. It looks really familiar, but none of us can remember for sure. it's been at least 20 years. PAS used unvented motors and paper dust caps too, SWR used them and maybe Eden too, they had a really nice midrange character for bass guitar but were not very robust and started failing as amp power increased over the years.
 
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