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Author Topic: Modify your speaker cabinet to allow parallel coupling??? How?  (Read 5899 times)

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rabidgerry

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Hi guy's, I have been thinking about this for a while now due to some amplifiers only have single speaker outputs on the back of them.  I play in stereo so the amps I use will have a left and right.  However some amps will have dual left and right allowing more cabs to be hooked up and of course the load will change and the possibility of more volume becomes available.

Like say if I have an amp that can take 4ohms into one output, and I have 2 x 8ohm cabs, but I can only hook one up at a time there for only giving about half the output of what the amp is capable off, would there be any way that I could couple the cabs?  So they could run parallel into the one output?

I have often wondered if someone ever designed a speaker coupling box for this kind of purpose but I have never come across one.  So I figured if there is no device that does this for you is it possible to fit a cabinet with a coupling input that allowed your cab to have another cab run into it and therefore change the overall?

Anyone any ideas about this feel free to fire them down  :)
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"whadda ya want? we want Heavy Metal"

Guitars:1986 Westone Dimension IV, 1989 Korean Squier Fat Strat Silver Series, 1998 Korean Squier Fat Strat, MIM Fender Fat Strat - FR, Squier Stagemaster Deluxe - Thru Neck x 2, Squier Stagemaster 22 Fret - 1st Gen, 1999 Squier Showmaster - Anniversary Edition, Squier Showmaster, Tokai FV40 Flying V

Effects:  Ada Mp1, Peavey Rockmaster, Boss GX700 Boss SX700 * Amps:   Rocktron Velocity 300 - Harley Benton GPA400
Cabs: 4 x Bugera 2 x 12"

MarshallJMP

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There are some possibility's ,the easiest way is to add a jack in one of the speakers cabinets so you can daisy chain 2 cabs.Or you can use a small box with 3 jacks,one input and 2 outputs.And last you can add a jack in the power amp if possible.

http://www.youtube.com/watch?v=y_HVgxUAVIU

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rabidgerry

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What is the box option Marshall?  Are these for sale or would it be a device I would have to construct?  Suppose constructing would be easy enough.  Hell it would give me another project (do I have the bloody time though?).

I could even add a series parallel wiring switch hmmmmmm you got me thinking. 
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"whadda ya want? we want Heavy Metal"

Guitars:1986 Westone Dimension IV, 1989 Korean Squier Fat Strat Silver Series, 1998 Korean Squier Fat Strat, MIM Fender Fat Strat - FR, Squier Stagemaster Deluxe - Thru Neck x 2, Squier Stagemaster 22 Fret - 1st Gen, 1999 Squier Showmaster - Anniversary Edition, Squier Showmaster, Tokai FV40 Flying V

Effects:  Ada Mp1, Peavey Rockmaster, Boss GX700 Boss SX700 * Amps:   Rocktron Velocity 300 - Harley Benton GPA400
Cabs: 4 x Bugera 2 x 12"

MarshallJMP

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Well maybe you can buy something like that but you can also DIY,it's quite easy,a box and 3 jacks wired in parallel.
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rabidgerry

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well this is failry easy to make on of these but palmer have already done it :)

http://www.palmer-germany.com/mi/en/CAB-M-Passive-Cabinet-Merger-PCABM.htm

I'm just going to buy it cause I'm lazy sometimes and it's cheap

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"whadda ya want? we want Heavy Metal"

Guitars:1986 Westone Dimension IV, 1989 Korean Squier Fat Strat Silver Series, 1998 Korean Squier Fat Strat, MIM Fender Fat Strat - FR, Squier Stagemaster Deluxe - Thru Neck x 2, Squier Stagemaster 22 Fret - 1st Gen, 1999 Squier Showmaster - Anniversary Edition, Squier Showmaster, Tokai FV40 Flying V

Effects:  Ada Mp1, Peavey Rockmaster, Boss GX700 Boss SX700 * Amps:   Rocktron Velocity 300 - Harley Benton GPA400
Cabs: 4 x Bugera 2 x 12"

rnolan

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Hey Gerry, this is cabs 101 stuff, you don't need to get fancy. But you do need to stay cognitive of the impedance. If only one jack out on the amp you can (easiest as MJMP says) daisy chain a second box (in parallel or serial depending on desired ohms). another common way is the amp has 2 output jacks wired together in parallel. So 2 x 16ohm speakers (cabs?) in parallel = 8 ohms (nominal) So parallel halves impedance, 2 x 8 ohms  in series = 16 ohms etc.
Parallel: = + <> + and -<>-
Serial = amp +ve > +(sp1) _(sp1) > +(sp2) -(SP2) > amp -ve
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Live Rig: MP2/MB1 > Alesis Quadverb > Alesis Midiverb 4 > Yamaha AM802 > B200s/Carvin TS100/DCM200L > ADA Split Stacks/Mesa P112s

rnolan

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The ADA split stacks have both parallel and series coupling jacks BTW - to get the impedance right
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Studio Rig: MP2/MB1 > Eurorack UB2442FX-Pro > TC M-One XL > Behringer Truths (with Truth Sub) / QUAD ESL 63s
Live Rig: MP2/MB1 > Alesis Quadverb > Alesis Midiverb 4 > Yamaha AM802 > B200s/Carvin TS100/DCM200L > ADA Split Stacks/Mesa P112s

rabidgerry

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Hey Gerry, this is cabs 101 stuff, you don't need to get fancy. But you do need to stay cognitive of the impedance. If only one jack out on the amp you can (easiest as MJMP says) daisy chain a second box (in parallel or serial depending on desired ohms). another common way is the amp has 2 output jacks wired together in parallel. So 2 x 16ohm speakers (cabs?) in parallel = 8 ohms (nominal) So parallel halves impedance, 2 x 8 ohms  in series = 16 ohms etc.
Parallel: = + <> + and -<>-
Serial = amp +ve > +(sp1) _(sp1) > +(sp2) -(SP2) > amp -ve

hey man, understand all that. The device below does exactly what I want, and this is just for scenarios when I am using cabs that are not my own but I would like to couple them in such a way that I can get their impedance to some up to something compatible with my amps.  The amps I use at the moment only have a left and right speaker output.  The new amp I wish to buy has 2 speaker outs for each side, so this is obviously parallel coupling.

I would have built something similar had I not discovered this

http://www.thomann.de/gb/palmer_cab_m_merger.htm
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"whadda ya want? we want Heavy Metal"

Guitars:1986 Westone Dimension IV, 1989 Korean Squier Fat Strat Silver Series, 1998 Korean Squier Fat Strat, MIM Fender Fat Strat - FR, Squier Stagemaster Deluxe - Thru Neck x 2, Squier Stagemaster 22 Fret - 1st Gen, 1999 Squier Showmaster - Anniversary Edition, Squier Showmaster, Tokai FV40 Flying V

Effects:  Ada Mp1, Peavey Rockmaster, Boss GX700 Boss SX700 * Amps:   Rocktron Velocity 300 - Harley Benton GPA400
Cabs: 4 x Bugera 2 x 12"

rnolan

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I don't know, You can just work out the various impedance of the boxes you get to plug into. They are going to be 8 Ohm cabs typically. If they are less i.e. 4 Ohm cabs you'll get a bit more from the amp, if they are more a bit less (very unusual to have a cab that isn't 4, 8, or 16 Ohm)
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Studio Rig: MP2/MB1 > Eurorack UB2442FX-Pro > TC M-One XL > Behringer Truths (with Truth Sub) / QUAD ESL 63s
Live Rig: MP2/MB1 > Alesis Quadverb > Alesis Midiverb 4 > Yamaha AM802 > B200s/Carvin TS100/DCM200L > ADA Split Stacks/Mesa P112s

rabidgerry

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I don't know, You can just work out the various impedance of the boxes you get to plug into. They are going to be 8 Ohm cabs typically. If they are less i.e. 4 Ohm cabs you'll get a bit more from the amp, if they are more a bit less (very unusual to have a cab that isn't 4, 8, or 16 Ohm)

I tend to run into cabs at 16ohm or else 4ohm with a 16ohm option also.

The reason this cab coupler box would be handy would be in a scenario where an amp only has 1 speaker output and you have 2 cabs and you want to use both so as you can get the full amount of output.  So an amp runs full power at 4ohm, but you have 2x8ohm cabs.  So that's completely sorted if you have the cab coupler because you stick the cabs into the coupler unit in the parallel inputs and make a load of 4, then run that to the speaker out of the amp and hey presto you have 4 ohm load delivering maximum output from the amp which is always a good thing.

I just remembered I will not need the cab coupler now because them amp I am looking at has 4 speaker outputs!  2 for each side left and right, however when I was looking at a marshall it only had 2 speaker outputs 1 for each side and this would have been an issue with the 4 speaker cabs I use.  I still might pickup one for emergencies.  Good little invention.
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"whadda ya want? we want Heavy Metal"

Guitars:1986 Westone Dimension IV, 1989 Korean Squier Fat Strat Silver Series, 1998 Korean Squier Fat Strat, MIM Fender Fat Strat - FR, Squier Stagemaster Deluxe - Thru Neck x 2, Squier Stagemaster 22 Fret - 1st Gen, 1999 Squier Showmaster - Anniversary Edition, Squier Showmaster, Tokai FV40 Flying V

Effects:  Ada Mp1, Peavey Rockmaster, Boss GX700 Boss SX700 * Amps:   Rocktron Velocity 300 - Harley Benton GPA400
Cabs: 4 x Bugera 2 x 12"

rnolan

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Hey RG, most cabs have an additional parallel jack on the back so you can daisy chain 2 x 8 ohm cabs to get 4. ADA cabs also have a series extension option. If the cabs only have 1 jack, then you need to use the splitter for amp with single jack.

Most solid state amps seem happy with 4, 8 or 16 ohm loads (more impedance = less output). But remember that 16 ohm speakers are typically more efficient/more sensitive (more coils/turns of copper around the voice coil). Tube amps use an output transformer between the amp and cab so you select the correct "tap".
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Studio Rig: MP2/MB1 > Eurorack UB2442FX-Pro > TC M-One XL > Behringer Truths (with Truth Sub) / QUAD ESL 63s
Live Rig: MP2/MB1 > Alesis Quadverb > Alesis Midiverb 4 > Yamaha AM802 > B200s/Carvin TS100/DCM200L > ADA Split Stacks/Mesa P112s
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