DRRI Extension Speaker

[JAM]

Anyone know what to safely plug in to that little hole that says extension jack? (ohm wise) or is it just there for looks?

Usually it's for a speaker.

[Kap'n]

You folks must all have worked with Fender on writing the manual...."maybe" doesn't work for me on my only amp...too risky....guess you guys have amps and money to burn

Rudeness doesn't work for me either.

[Wilko]

Safest is to use a 16 ohm external speaker.

Here's why. If you use 8 your amp sees 4 ohms.

If you use 16 your amp sees 5.33 ohms.

5.33 is closer to 8 then 4 is.

[JAM]

Squeezebox,

Sorry for the smartass reply, here's to summarize:

Yes, you can use the BD speaker. You wont hurt the amp, but because of the lower load the amp isnt going to put out full power.

[CJ Neel]

Well, I guess I'm just an idiot because I can't find the answer

Again, Yes or No is the only answer i am looking for

Here it is:

Back in the day, Leo designed his amps to be tolerant of a -50% impedence mismatch from design standard

So if you had a Delxue Reverb, and plugged in official 1x12, 8 ohm Deluxe Reverb extension cabinet (they do exist) in addition to the internal 8 ohm speaker, you were very unlikely to have an technical issue with the four ohm load.

[Squeezebox]

thx

[Jazzguru]

Posted by Kap'n
The water pipe analogy works well for me.

If you can move x amount of water with one pipe of water, you can move twice as much water with two pipes side by side (in parallel). That's because you have half as much resistance to the water flow.

HuH? isnt it because you have twice the diameter or area to move the water thru at the same pressure?
PV = nRT in chemistry/physics at least. Yeah I know its the ideal gas law but ......

[NTBluesGuitar]

It's not about taking one pipe and splitting it into two more, I think.

I see it like having a HUGE water tank and a small pipe to drain it...if you had two pipes it can drain more.

"Well that's one more, now, inn'it?"

[Kap'n]

HuH? isnt it because you have twice the diameter or area to move the water thru at the same pressure?
PV = nRT in chemistry/physics at least. Yeah I know its the ideal gas law but ......

Well the walls of the pipes are confinement, or resistance to flow.

By doubling the piping in parallel, you are halving the resistance to flow.



I'm open for ideal gas law questions, too.

[Wilko]

Well the walls of the pipes are confinement, or resistance to flow.

hmmm... The walls of the pipe are not usually included in the analogy as applied to the study of resistance to motion of fluids. Just the cross-sectional area of the passage.

[Kap'n]

hmmm... The walls of the pipe are not included in the analogy as applied to the study of resistance to motion of fluids. Just the cross-sectional area of the passage.

Well, I wasn't meaning any sort of friction, or impediment of laminar flow.

I just meant that the walls of the pipe define the cross-sectional area, and that defined area is what restricts the flow.

[Wilko]

of course. I thought of that after I posted. Sorry.

Turbulence, pressure, volume, gravity, wind speed.

[CJ Neel]

That makes me nervous, that bit about "restricts the flow"...

[Kap'n]

.

[CJ Neel]

[Wilko]

[Kap'n]

[Wilko]