Doyle Audio 412 Series Parallel Wiring Part 2

Which way is West? And do I need to go that way?

Category:

Science & Technology

Tags:

• Doyle
• Audio
• Guitar
• 412
• speaker
• cabinet
• Marshall
• Series
• Parallel

[coldandhomeless]

i swapped my speakers in my cab from 8 ohm speakers to 16 (4x12), and in my other cab 16 ohm to 8... i was wondering if it was safe? both cabs are stereo, one Was labelled 8ohm mono/16ohm stereo, or 2ohm mono/4ohm stereo with 8ohm spkrs, and othr cab WAS labelled 4ohm mono/16ohm stereo, or 8 ohm stereo with 16 ohm speakers, all i did was swap the speakers, and my amp head has 4/8/16 ohm switch... 100w tube, 80w speakers all around. have no idea what to set it to one either end to be safe. HELP!!

[doyleaudio]

@coldandhomeless

Dear Homeless

I don't know the switching system you have so I can't comment on what's what. There is a lot of potential screw ups with stereo cab's. The bigest one is when you use 2 different amps and throw the mono switch that ties the amps together. BIG BANG GO BOOM.

I can say that the best thing to do is measure with a meter and 1/4 cable, your ohm on the cabinet. Make sure you are not using the 2 ohm load in one. Amps hate to run at low ohms. Thats what will kill them.

[magicmomentsvideo]

Hi, Based on your video Pt1 if all four speakers are 8 ohms then am I right in saying that in wiring then this way (series parallel) the total impedance is 8 ohms and if I was to connect a second cab in jack to jack this would become 2 x parallel makeing the impedance 4 ohms. Many thanks - great video. N

[doyleaudio]

That's it. Correct. Two 8 ohm cabinets plugged in parallel is a 4 ohm load.

p.s. Make sure you use a real speaker cable and not a guitar cable.

[randygonet]

Ok, I have a 16ohm 4x12 cab and my amp has a switch on the back for 4-8-or 16ohms. If I get another cabinet

what ohm should it be? And what should the switch be set to?

[doyleaudio]

Two 16 ohm cabinets in parallel will give you an 8 ohm load.

Cheers

[BraveMavrick]

Thank you for the great videos, I have a question you might be able to help me with. I have a 4x12 cab wired in series-parallel, it has two imput jacks and it says in the manuel that it can be wired like two 2x12 cabs, how would I do this? I got rid of the stock speakers and installed two v-30's and two 70-80's and I would like to run them seperate.

[coldandhomeless]

@doyleaudio would you suggest that i ditch the stereo jacks and switches? (cause i never use a stereo signal, generally just one cable) because if i just looked up the wiring, i could have one 8 ohm cab with the 8 ohm speakers, and either 4 or 16 ohm cab with the 16 ohm speakers. im leaning toward the 4 ohms cause thats where it was usually set before the swap. im really glad u replied so soon, cause u seem to know ur stuff. are the watts different when in 4 ohm mode with the 16 ohm speakers?

[joelg125]

Im reinstalling the back of a 4x12 but was thinking of adding weather stripping (or something) just to better seal the cab from farting (what is cabinet farting btw?). Is this a good idea?

[magicmomentsvideo]

Many Thanks for your quick reply. N

[doyleaudio]

Two things.

Is it the same speakers as the first?

Is it the same Efficiency as the first?

All things being equal, an 8 ohm cabinet will draw twice as much power, sounding twice as loud. Try to make the second cabinet a 16 ohm to match the first.

Some times you may have a cabinet that has very heavy bass orineted guitart speakers that are a lot less effiecent than Mid range speakers. It may balance out.

But ultimately plug them into your amp together and set the bias on the amp accordingly.