Unknow speaker. Power handling

[chocopower]

Hellow,

are there any simple test to measure the power handling capability in a speaker.
"Simple" means: No osciloscopy. No signal generator....

I know, i know.
"play it hard till it seems to be in problems"
I would like to use that method as last solution.

Pics attached. Maybe some one know the logo or have some information.
Is 12" - 16ohm

[LooseChange]

Cool looking speaker. Size matters. Looking at the magnet size and age (can't see the voice coil but I figure it's small too) I would guess 15 to 25 watts max.  Age is another factor. Could be a 25 watt speaker but crank it up with a 10 watt amp and she could blow.

[FYL]

are there any simple test to measure the power handling capability in a speaker.

You can somewhat guesstimate it by measuring the voice coil diameter (usually sightly smaller than the glued dust cap) and looking at the motor assembly as well as the suspension.

For pre '60 12" speakers used in MI applications:

1" => app. 5 watts (very small magnet, one-piece paper cone with an untreated pleated surround) to 10 watts (medium-sized magnet, treated surround)
1.25" => 10 to 20 watts
1.5" => 15 to 30 watts (large magnet, glued fabric surround)
2" => 25 to 60 watts

Post '60 speakers usually have higher ratings, 50 to 100% depending on brand/model/... OTOH, most vintage paper cones and surrounds have become quite brittle and fragile, with very poor real-world power handling.

Can you post higher resolution pics of the logo as well as of the markings on the basket?

[Tiny_Daddy]

Looks like an extension speaker for a movie projector. Any brand name?

[chocopower]

those are seller pics.

When it arrives i post some more.

thanks!!!

[Frankenamp]

Looks like an extension speaker for a movie projector. Any brand name?

Correctamundo! It is an extension speaker of some sort. It looks to be no earlier than late 50's styling. If it is a 12" driver I would guesstimate from the size of the motor that the VC is 1.25 to 1.5". Given the age, I wouldn't hit it with anything much over 15 watts. Ten really distorted, or 20 sqeaky-clean watts.

EDIT: Looking closer, at the second picture It seems to be a "Peerless" brand driver. Peerless is a pretty good Danish brand. What you have is a higher-end utility speaker.

[kagliostro]

Which a nice future combo ..............

Kagliostro

[tubeswell]

I vote for 15-20W judging by the size of the magnet in relation to the frame

[chocopower]

Which a nice future combo ..............

Kagliostro

You read my brain!!!  

A vox AC15 or a 5E3 tipology amp will be a nice partner for this cab.

[rafe]

That would make a nice looking Vibro-champ 

[chocopower]

Now i need to think about the best way to put the controls (vol, tone...) with minimun cab damage.

Ah! back side!

[chocopower]

Cab at home.

is mark with:

"P120FM  -  16ohm"

Googleing:
Peerless  P120FM: 30,5cm - 8Ohm - 20Watt - Fres40-16kHZ - Alnico - Doppelkonus

I tried to get out the bell without succes.

[FYL]

Peerless  P120FM: 30,5cm - 8Ohm - 20Watt - Fres40-16kHZ - Alnico - Doppelkonus

A dual cone wide range speaker designed for hifi/PA applications. Could be too smooth and too linear for MI.

The 20-watt power rating should be halved for MI.

[jeff]

Cool looking cab.

 It always confused me that they mark a speaker with the one thing you can test for easily with a multimeter(Ohms) but don't mark the thing you can't test for.

[chocopower]

Peerless  P120FM: 30,5cm - 8Ohm - 20Watt - Fres40-16kHZ - Alnico - Doppelkonus

A dual cone wide range speaker designed for hifi/PA applications. Could be too smooth and too linear for MI.

The 20-watt power rating should be halved for MI.

I´ll test it tomorrow with diferent amps.
If the speaker is not ok for guitar use, i´ll try with some celestions i have around.
I love the cab look so much!

[chocopower]

Cool looking cab.

 It always confused me that they mark a speaker with the one thing you can test for easily with a multimeter(Ohms) don't mark the thing you can't test for.

Never thought about it, but you are on right. 

[chocopower]

Eii!!

is perfect for my last baby!! (with a diferent speaker, i know)

http://www.el34world.com/Forum/index.php?topic=11677.0