ok feathers, now im gettin lost. explain please.
so say if im using a 8 ohm speaker in the amp (because say the amp is 8ohm)
i cant just go use another 8ohm speaker for the cab?

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63supro
"The good thing is in a club situation, most of the patrons are trashed and really can't tell the difference."

No, you can not. 2 8 ohm speakers wired in series would give you 16 ohms, 2 8 ohm speakers run in parallel would give you 4 ohms.

_________________
Chet Feathers

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I didn't Lose my mind, I traded it for this guitar.

here you go way cool
http://www.about-guitar-amps.com/speake ... lator.html
I "think" as long as the total ohms aren't greater than the amps built for is the start point, although Billm says BJ could drive 16ohms without problems if I've read it correctly in the Tele post earlier

ok feathers, you and i are gonna have to have a set down. (if your willing)
im confused big time.
ok the speaker in my BLUES jr says "Jensen Special Design" i dont see a ohms
rate anywhereon the speaker.
then im gonna have to learn how to wire series and parallel.

_________________
63supro
"The good thing is in a club situation, most of the patrons are trashed and really can't tell the difference."

killer link 555. saved this one to my study folder.
thank you bro, big BIG help.

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63supro
"The good thing is in a club situation, most of the patrons are trashed and really can't tell the difference."

Hey Chets right on this... I do believe that you could get a y connect cable and extend an additional 8 ohm speaker. I think that the BJr will tolerate a 2:1.( I didnt realize that it did not have an additional speaker out jack) But as Chet states to do it correctly you would need to replace both speakers.

_________________
Hey, Boy Blue is back!

_________________
Chet Feathers

Authorized TonePros Dealer
Authorized WD Music Products Dealer
F/A Official Southpaw Compliance Certification Tester http://faamps.com/

http://www.facebook.com/cafeathers


I didn't Lose my mind, I traded it for this guitar.

The Blues Jr is 8 ohms.

_________________
Chet Feathers

Authorized TonePros Dealer
Authorized WD Music Products Dealer
F/A Official Southpaw Compliance Certification Tester http://faamps.com/

http://www.facebook.com/cafeathers


I didn't Lose my mind, I traded it for this guitar.

so the total of both speakers can not exceed the ohms the amp was designed to push
correct? im reading up on it as we speak.

_________________
63supro
"The good thing is in a club situation, most of the patrons are trashed and really can't tell the difference."

Hi way cool jr,

There is only one speaker jack on the BJr. If you unplug the internal speaker, and plug in an external cabinet, you can use any 8 ohm cabinet that you want. I think that what some are saying is that if you use two speakers in an external cabinet, you should wire them to be 8 ohms (two 16 ohm in parallel, two 4 ohm in series). The internal speaker would be disconnected when using an external cabinet. I agree that the BJr would work fine with a 4 ohm speaker arrangement also, probably altering the original sound though.

_________________
---> "The amp should be SWITCHED OFF AND UNPLUGGED before you do this!" <---

Por favor, disculpe mi español, no se llega a la práctica con mucha frecuencia.

at the risk of sounding more stupid, do most speakers come in 4,8, and 16ohm's?
is one ohm better choice than the other for any reason?
what about speak magnets? how do they differ?

_________________
63supro
"The good thing is in a club situation, most of the patrons are trashed and really can't tell the difference."

ok what im wanting to do is get the mod where a ext speaker jack is added to the jr so i can add a 1X12 cab to get two speakers working off the same amp.

_________________
63supro
"The good thing is in a club situation, most of the patrons are trashed and really can't tell the difference."

I see now, I reread your OP. If you add another jack, you can still use an 8 ohm external speaker with your original 8 ohm at the same time. There is no problem running the BJr amp at 4 ohms, which is what you would have when using both jacks, each with an 8 ohm speaker. Normally, best practice is to match the impedance of amp and speaker to get the sound as designed. The impedance matching is about amp efficiency, and changing the speaker impedance load on the amp will change the sound.

This is from the Billm site about adding another speaker jack.

"Aux speaker jack kit: $10
High-quality, all metal Switchcraft jack, pre-soldered leads, lock washer, and nut. Requires drilling a 3/8 inch hole adjacent to the existing jacks. The aux jack is in parallel with the main speaker jack and is intended for use with a second 8 ohm speaker or cabinet. It does not cut off the internal speaker."

And

"bill says:
August 9, 2010 at 8:53 am

Yes, the BJr can drive a 4 ohm load without problems."

_________________
---> "The amp should be SWITCHED OFF AND UNPLUGGED before you do this!" <---

Por favor, disculpe mi español, no se llega a la práctica con mucha frecuencia.

Some on this forum will argue, but the Blues Jr. was designed to have an 8 ohm load PERIOD. Unless you change out the OT you risk doing damage to the amp. Even Billm will qualify the addition of an additional speaker jack only (without changing the OT) by "if used occassionally and not at high volumes"

I know this because I was very interested in doing the same thing you wish to do. In fact, I got a Y splitter and actually tried it out with the stock speaker and an 8 ohm ext. cab (total load then = 4 ohms). It sounded great, but to be sure, I questioned Billm via his website and was given the above caveat in quotes. I decided it was not a risk I was willing to take. You may elect to take the risk, but at least you'll understand it is a risk.

Scour his website closely for the caveate and you should find it.

_________________
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thank you for joining in on this. im on bill's site now and see nothing of him against the ext speaker idea. can you direct me please.

_________________
63supro
"The good thing is in a club situation, most of the patrons are trashed and really can't tell the difference."