howarddavidp Posted September 1, 2015 Share Posted September 1, 2015 Hello, So, it was time to upgrade. I had a Spider2-150 for what seems like a decade. I wanted to do more with my amp and get tube distortion, possibly even sell my Peavey 6505 now that I have a tube from Line6. So, my questions: #1 - I kept my 4x12 Spider2 slant cabinet. It looks like I can set the amp to 8 ohms stereo and use the existing Line6 cab just like I did with the Spider2? I run 2 speaker cables (1/4) from the left and right outs on the amp to the left and right 8 ohm in's on the cabinet? This seem correct? I think the cabinet is rated at 320 watts, and the output of the valve is rated 240w, so I should not blow anything up? #2 - So, if I want to go FULL STACK, I could put the amp output to 4ohms, and run 1 cable to the Line6 slant cab as 4ohm mono and use the left-mono plug. I also have a Peavey 5150 cab with 4 x 16ohm speakers in that. I think that cab has, or can be wired as 4 ohm input by running the speakers in parallel? Basically, I would split the input signal 4 ways, one + and one - to each speaker so that the 4 ohm signal is sent to each of the speakers? Does this sound correct? Or, does the 4ohm incoming to the cabinet get broken down to 1 ohm per speaker? I always though if you put 4 speakers in parallel, then the speakers would each run at 25% of the rated ohm; if you ran 2 in parallel, then 50%, etc? If it works like I remember (been years since I had to rewire any cabinets), then I can practice with my slant, and switch to full when I go to jam with friends. Replies appreciated, the 5150 cab has celestions (the British ones), I also think the line6 cab has Celestions as well, but some special Line6 variant of their speakers. Replies appreciated. Dave Quote Link to comment Share on other sites More sharing options...
napynap Posted September 3, 2015 Share Posted September 3, 2015 Most speakers are wired in parallel, but check your manual or open those cabs.. Here's some general Ohm impedance formulas: Series: A Ohm + B Ohm = Total OhmParallel (common Ohms): Common Ohm / # of speakers = Total OhmParallel (uncommon Ohms 2 speakers): A Ohm X B Ohm / A + B = Total OhmParallel (uncommon Ohms 3 speakers): 1 / (1/A + 1/B + 1/C) = Total OhmSeries+Parallel: Use above formulas together, compute series first as one speaker load, then do parallel formula. Quote Link to comment Share on other sites More sharing options...
howarddavidp Posted September 3, 2015 Author Share Posted September 3, 2015 Thank you for your reply. Even thought it was kinda-generic. I say this because I don't think Peavey ever released a cabinet with multiple speakers of different ohms, it is a 4x12 with all speakers of 16 ohms. It seems like I will use the 4ohm out with left and right going to top and bottom cabs. When I practice at home, I will switch to 8 ohms stereo and plug both outputs to the Line6 cab. Thanks for the clarity, should get the amp today or tomorrow. Dave Quote Link to comment Share on other sites More sharing options...
howarddavidp Posted September 10, 2015 Author Share Posted September 10, 2015 Hello, OK, I can't do what I thought I could. The Spider Valve Mk2 will only allow pairs of 8-Ohm or 16-Oms, no 4-Ohm pairs. You can go single with 4, 8, or 16-Ohms it seems. So, I have a straight cab that is 16-Ohm, and my Line6 Spider2 slant cab is either 4-Ohm Mono, or using 2 plugs it will do a pair of 8-Ohms stereo. But, I think I have an idea: I can rewire the Slant cab from the spider 2 to series-parallel to get it to do 16-ohm mono. I researched and it seems it has 4 x 16-Ohm speakers, so doing a re-wire to series-parallel will get me to 16-ohm in a single 1/4" input. This sound right? I wish there was a plug that would allow me to switch between an 8-Ohm pair for practice at home on the 1/2 stack, the allow me to switch to the series-parallel wiring to run a full 16-ohm stack when I go practice with the band. Anyone know of this? But sicne I can run a single 16-Ohm out from the Spider Valve Mk2 head, I will just run it as mono on the 1/2 stack, then switch to the 16-Ohm pair output to go full stack? The straight cab is a Peavey with 4 x 12" 16-Ohm speakers, and I guess they are already in the series-parallel wiring, so now I just have to do the same with the top slant cab? So, the back of the amp has 3 output combos, being: Output=A : Single 16-Ohm output <--- will use this with rewired L6 Slant in Series-Parallel Output=B : Single 8-Ohm OR 16-Ohm pair <--- Will use this to go full stack with Rewired L6 slant and Peavey Output=C : Single 4-Ohm OR 8-Ohm pair <--- Using this now with non-rewired L6 Slant as 8-Ohm stereo pair Thanks, Dave Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.