Technical question: re.Series Speaker Output

[Broken_Vacuum]

I was searching google for a wobbly hum that comes out of my Musicman HD130 head at low volumes and came across a fact I did not know anything about. Their output speaker jacks are wired series. I saw someone on talk bass was saying how that allows you to daisy chain 4 cabs out of those 2 output jacks. I play out of a late 70's Marshall 16ohm cab that isn't stereo and an Orange cab that is. I have the 16ohm Marshall coming from the Extension Speaker and the 4ohm Orange out of the Mains Speaker. Am I running the wrong load at 8ohms if they are series and could this be a cause of the wobbly hum noise? Should I have it switched over to the 4ohm side when running those cabs?

Side note- how does daisy chaining cabs work, and how would I go about running 4 cabs? I would obviously have to rewire the Marshall into the current Marshall wiring for stereo, right? in order to run 4 cabs since that cab only has one input jack anyways orr would I be able to run 3 cabs?

I run into the Input 1 on the bass side and then jump channels from Input 2 in the bass side to Input 1 of the Guitar side. Is it possible to run the channels independent of each other to run stereo effects into one head and out to 2 or more cabs for stereo or would that not work since the channels can't split the signal into the cabs seperate so that it is stereo?

Basically I want to run 2 full guitar cab stacks through one head and as a bonus try and split the head into to seperate channels for stereo effects. Are either of these idea's possible? And better yet are they possible together?

[MEC]

I have zero knowledge about the Musicman HD130 and how it's wired. I looked for a schematic but couldn't find one so I'm just going on the information you've given.
If the speaker jacks are wired in series then the cabs you are using in your current configuration are creating a 20ohm load (16+4). If you were to daisy chain the Orange into the Marshall the load would be 3.2ohms. Ideally you want the Ohms from the speakers to match the Ohms the amp is expecting. The way you are running it know will not hurt the amp but also will not produce as much power as it could if it were matched. If you daisy chained the Orange into the Marshall it could cause the amp to overheat and burn up a transformer or tube.

For the best possible results, if the amp was set to 16ohms you would plug a 8ohm cab into each jack, if it were set to 8ohms you would plug a 4ohm cab in each jack or daisy chain two 16 ohm cabs from a single jack and at 4ohms you would plug a 2ohm cab into each jack or daisy chain two 8ohm cabs from a single jack.

If you want to run four cabs you would daisy chain two 8ohm cabs from each jack and and set the amp to 8ohms or daisy chain two 4ohm cabs from each jack and set the amp to 4ohms. Either way when daisy chaining all your cabs need to have the same Ohm impedance.

Without knowing how many speakers are in your cabs and the actual ohm rating per speaker it's hard to say if your current cabs can be wired to be compatible and match ohms with your amp.

Here's some more info:
http://www.legendarytones.com/ohms.html
http://colomar.com/Shavano/impedance_proc.php


As far as the two channel stereo thing goes, I doubt it will work.

[Broken_Vacuum]

I kinda figured the 2 channel stereo was a pipe dream. As for the speakers, in the Orange there's 4 Celestian Greenbacks but I'm not sure what individual speakers ohmage is. I'll check tomorrow at practice, and the Marshall has 4-G12-75's (which are all 16ohm) which I believe is wired series/parallel . I'm going to look at those 2 links now.
That was a very informative answer, I thank you a ton! I just noticed that half of that one sentence was missing. No clue how that happened.

My bands gonna hate me when I tell them I'm not as loud as I could be. While I'm looking at those sites, what about a 3 cab set up? Daisy chaining another 4ohm cab off the orange and have the marshall run from the head? For some reason I think this idea is impossible with 3 cabs but I wanna make sure before I give up.
Ideally louder is better so I should either rewire the orange or the marshall to match each other first, then worry about daisy chaining maybe?
Sorry if this is all a mess. Oh also the head can only be set at either 8 or 16ohms. no chance for 4

[MEC]

Since the Orange has Greenbacks they are probably four 16ohm speakers run in parallel. If that is the case that means you can rewire it to series/parallel and make it a 16ohm cab.
http://www.eminence.com/support/wiring-diagrams/

After you rewire the Orange you can daisy chain it and the Marshall from the main speaker and set the amp at 8ohms and everything will be matched. This would also allow you to daisy chain two more 16ohm cabs (4 cabs total) or run a single 8ohm cab (3 cabs total) from the other output with the amp set to 16ohms.

Side note: The Greenbacks are only 25watts each and together make a 100watt cab so be careful when using that cab all by it's self with that 130watt amp.

[Broken_Vacuum]

Well all of this comes at a perfect time, we got kicked out of our practice spot so I'll have my cabs at my house to rewire now. works out perfectly. Thanks again for you're help! much appreciated.