Building a 1x12 Thiele/Small guitar cabinet.

[bcdon***]

Wow, looking really good. Bet it will sound great with the Boogie.

[Monkus]

Thanks bcdon, lets hope it sounds good!

After intensive research and invaluable comments from Tung and Tig...(thanks guys)!

I decided on an Eminence Delta 12A Speaker for the cab. The thing is, its rated at 400W RMS, 800 peak, which flies in the face of all conventional wisdom.

Specs on the Delta here:

http://www.eminence.com/pdf/Delta_12A.pdf

From my googling, this seems to be ideal replacement for the EVM12L. It also seems that this speaker will not color the sound of an amp and has a 'better' sound than the EVM12 L which the speaker enclosure was designed for. Locally, I got one new for about $50 so what the heck, I'll try it. I need to figure out how to "break" in a speaker with a 9 volt battery.

On to the pics!

Internal bracing finished, including port area.




Cleaned up a little and from another angle. You can't see it very well. but the edges have been routed to a rounded edge.

[tunghaichuan***]

From my googling, this seems to be ideal replacement for the EVM12L. It also seems that this speaker will not color the sound of an amp and has a 'better' sound than the EVM12 L which the speaker enclosure was designed for. Locally, I got one new for about $50 so what the heck, I'll try it. I need to figure out how to "break" in a speaker with a 9 volt battery.

I wouldn't use a 9v battery, it is DC and could possibly overhead the voice coil. You need and AC source like a wall wart, a filament transformer or Variac.

The formula for figuring out the amount of wattage a particular voltage level will generate is V(squared)/R or ac voltage squared divided by the speaker's resistance. If you want to get technical, you should measure the DC resistance of the coil, which should be around 6.3 ohms for a speaker with an 8 ohm nominal impedance rating according to the Delta specs .pdf.

So for 25VAC, you get 25*25/6.3=99.2 watts. You may want to try lower AC voltage, even though the Delta is rated for 400 watts. The more wattage you put into the speaker, the louder it will be and that 60HZ tone will drive you nuts.

Looking at the specs for both the Delta 12A and the EVM 12L, the Thiele specs are close but not identical. I bet the Delta sounds fine. I'll be very interested as my Thiele cabs are loaded with Celestions, but I'd like to hear them with Delta speakers.

HTH.

[bcdon***]

I wouldn't use a 9v battery, it is DC and could possibly overhead the voice coil. You need and AC source like a wall wart, a filament transformer or Variac.

What is the purpose of this 'break-in' ? Are all speakers broke-in is some fashion or another (e.g. stereo speakers, tv speakers, &c)?

[tunghaichuan***]

What is the purpose of this 'break-in' ? Are all speakers broke-in is some fashion or another (e.g. stereo speakers, tv speakers, &c)?

The break in loosens up the parts. The consensus is that speakers sound better after being broken in. Some speakers can sound shrill and "stiff" and breaking them in can tame the ragged high end. This article explains it better than I can:

http://www.premierguitar.com/Magazin..._Speakers.aspx

Stereo speakers are a different animal. They have synthetic cones and surrounds, which do not loosen up over time like the paper cones in guitar speakers. Stereo speakers are typically played clean with no distortion in the signal, their purpose is to reproduce recorded sound. Guitar speakers generate music and there can be lots of harmonic distortion in the signal.

[Ch0jin]

.....Stereo speakers are a different animal. They have synthetic cones and surrounds, which do not loosen up over time like the paper cones in guitar speakers. Stereo speakers are typically played clean with no distortion in the signal, their purpose is to reproduce recorded sound. Guitar speakers generate music and there can be lots of harmonic distortion in the signal.

Or as I like to say "Hi-Fi speakers are about reproducing the sound. Guitar speakers are about creating the sound"

I've never really tried to break any in myself though. The speakers in my 4x12 were made in the 60's so I'm assuming they were broken in long before I acquired them

[bcdon***]

Or as I like to say "Hi-Fi speakers are about reproducing the sound. Guitar speakers are about creating the sound"

I've never really tried to break any in myself though. The speakers in my 4x12 were made in the 60's so I'm assuming they were broken in long before I acquired them

Isn't this akin to the 'worn' guitars? Why not wear them in yourself by natural use instead of speeding up the process by synthetic means.