Did Dumble reverse polarities in his cabs?

[PierreL]

Actually, with the Fuchs and Two Rock amps which have a reverb, the cab polarity (or the speaker cable's) needs to be reversed.
Straight from Two Rock's site :

Speaker Cabinet and Combo Wiring:

Care needs to be taken when installing new speakers or adding other manufactures cabinets to our amps. All of our amps that have reverb have a reverse phased output section. What this means is that the signal is in the negative swing as it leaves the amplifier. Traditional wiring of speakers takes the “+” positive terminal and connects it to the tip of the speaker jack, and the “-“ negative terminal and connects it to the sleeve of the speaker jack. When the speaker gets the signal in this configuration the speaker will push first and the pull. If the wiring of the cabinet is “Out of Phase” with the amp then the speaker will pull first and then push. We wire all our cabinets and combos that pair with our reverb amps with the “-“ speaker terminal going to the tip of the speaker jack and the “+” positive going to the sleeve. This way the signal that is in the negative swing as it leaves the amp see a negative polarity at the speaker. Causing it to push first and then pull. Making sure that the amplifier matches the cabinet will result in the amp/speakers working together. This will increase the dynamic range and tone of the system. It will not hurt the amp to have the speaker running in an opposite polarity then the amp. It will just sound slightly muffled and not have the headroom. Amplifiers that have no reverb will want to be wired in the traditional manner.

It does indeed make a difference with my Fuchs.

[talbany]

..The two "Major differences (single amp/Cab) being..The change in attack, versus the softer diffuse attack. Also the reproduce able feedback phenomenon.(Feeding back on certain frequency's) ie..Fundamental,4th, etc..Due to (reversed) negative feedback coupling,with the amp CRANKED!!

BTW.. The Express and Liverpool Trainwreck designs are "out of phase with the input" ..I have never seen Ken order a directive to change his speaker phasing..I believed he thought it was a part of the amps character!!..(Maybe that's why I've never been a big fan of TW amps )..Blackface AB series combos.with reverb tanks has 2 channels that are out of phase (Reverb being out of phase w/input) with each other...

If we look at Robbens rig and how he sets it up,
http://www.youtube.com/watch?v=jzVq9JsBLsI
In this type stereo setup he needs to pay attention to phasing issues...So it makes sense for him to use a phase reversed cable to be in phase with his Super when he runs them together and in Stereo!!!..Here is why..
Since the Amp and Lator have an odd number of gain stages (out of phase with the input) and he runs his Super in the Reverb side (again odd number of gain stages) the Dumble would be out of phase with the Super (The super being in phase) coming out of his TC unit.. So if he wanted to run them both in phase (to get full Stereo effect)) with each other the logical thing would be to reverse the Dumble or use the Normal channel in the Super.....There it is...Interesting huh!!

Here is a list of a few pedals that will reverse your phase..Sometimes reversing phase is a part of the pedals job to give you that sound..(especially with compressors or boosters!!)....If we did pickups it might be even longer!!

boosts/overdrives/distortions/pre-amps:
Analogman KOT (each channel inverts independently)
Bad Bob Booster
Badger Badgerplex Vintage Pre (The Badgerplex Plural does NOT invert)
Boss DS-1
Boss OD-1
Catalinbread Super Chili Picoso
Cmatmods Super Signa Drive (each channel inverts independently)
Colorsound Overdriver/Power Boost (and clones of)
Danelectro Daddy-O Overdrive
Devi Ever Dark Boost
Devi Ever Karaoke Party
Electra Distortion
Electro Harmonix LPB
Fuchs Plush Pure Gain
Fulltone Fat Boost1 (FatB2 and FatB3 do NOT invert)
Henretta Engineering Choad Blaster
Ibanez SML Super Metal
Kingsley Jester Overdrive/Boost (each channel inverts independently)
Legendary Tones (pre-Keeley) Time Machine Boost: Vintage channel inverts when engaged regardless of '66 or '73 setting. (Modern channel does NOT invert)
Lizard Legs Flying Dragon Boost
Lovepedal Amp Eleven (each channel inverts independently)
Lovepedal COT
Lovepedal Les Lius
Marshall Bluesbreaker OD
Menatone Dirty Blonde (6 knob knob version)
Menatone Fish Factory (each channel inverts independently)
Menatone Foxy Brown (4 knob jacks on top battery on side version)
Manatone Howie (6 knob version)
Menatone Red Snapper (4 knob red box, jacks on top version)
Menatone Shut Up And Drive
MI Audio Boost n Buff v1 and v2 (always inverted. inverts engaged AND bypassed)
MI Audio Tube Zone
OceanFX Pearl Drive
Seymour Duncan Twin Tube Classic (channel 1 inverted. channel 2 flips signal back to non-inverted when engaged)
Skreddy Screw Driver
Soulsonicfx Hunny Bunny OD
Telenordia Treble Boost
Xotic BB plus (each channel inverts independently)
Xotic EP Booster
Zvex Super Hard On (and clones of)

ANY single transistor boost....


(general):
ANYTHING that has 1,3 (or any other odd number) inverting gain stage(s).....for example: Spencer Subzombie fuzz


compressors:
MXR Dynacomp
Okko Coca Comp

all Ross compressors,clones and variants invert: some examples.....
Analogman Bi-comp (only one channel inverts) (Ross side of the Bi-Comp inverts. Orange Squeezer side does NOT invert)
Analogman CompRossor
BYOC 5 knob compressor
GoudieFX Compressor
Keeley Compressor
Retro-Sonic Compressor
Wampler Ego Compressor (compression signal inverts. clean blend does NOT invert)

delays:
Biyang AD-10 (only dry signal inverted, repeats are non-inverted)
Blackbox/Ooh La La Quicksilver
Danelectro Dan Echo (always inverted. inverts engaged AND bypassed)
Danelectro Fab Echo (always inverted. inverts engaged AND bypassed)
DLS Echo-Tap
DMB Lunar Echo
Electro Harmonix Deluxe Memory Man
Empress Super Delay / Vintage Modified
Ibanez AD-80 (always inverted. inverts engaged AND bypassed)
Lovepedal Echo Baby
Seymour Duncan Deja Vu (when true bypass: inverts when engaged / when buffered bypass: always inverted. inverts engaged AND bypassed)
SIB Blue Echodrive
TC Electronic Nova Delay


fuzz pedals:
Blackout Effectors Musket Fuzz (from Kyle @ blackout: "5 inverting gain stages, which results in flipped polarity")
Bluebird Fuzz
Colorsound Tonebender (and clones of)
Electronix MessDrive Hybrid
Fender Blender
Gretsch Controfuzz
Maestro Brassmaster / Malekko B:Assmaster
MI Audio Pollyanna
Mosrite Fuzz Rite (and clones of)
Skreddy Lunar Module and Dlx
Soulsonicfx Shizzle fuzz
Spencer Mixmuff
Spencer Subzombie (stage #1 and stage #3 invert)
Spencer Suprazombie
Zvex Fuzz Factory

(general):
octave up fuzz's


modulation pedals:
chorus:
MXR Micro Chorus
TC Electronics Chorus

flangers:
MXR Micro Flanger
Ross Flanger (ac powered)

phasers:
MXR Phase 90 (original)
Red Witch Moon Phase

tremolos:
Danelectro Cool Cat Tremolo
Danelectro Tuna Melt Tremolo (always inverted. inverts engaged AND bypassed)
Effectrode Delta Trem Tremolo

vibe pedals:
Effectrode Tube Vibe

vibrato pedals:
Behringer UV300: inverts in "latch" and "unlatch" mode / does NOT invert in "bypass" mode (inverts in some modes but not in others)

multi fx:
Digitech RP-155 (always inverted. inverts engaged AND bypassed)


noise reduction:
Behringer NR300


PEDALS THAT INVERT PURPOSEFULLY(to correct out of phase pedals etc.)

- Barge Concepts VB-jr
- Badger Schism
- GigRig Humdinger
- GigRig Wet Box
- One Control Mesquite Blender

Tony

[PierreL]

Damn I have a Nova Delay...

[MKB]

I am grateful to Dumble that his overdrive circuit does not invert phase as compared to when it is switched out. Some amps do invert phase when channels are switched, which can be a mess if you care about such things.

At first blush the Dumble circuit's output is in phase with its input. However the FET input will swap the phase. So if you wanted to play with phase, switch between the standard input and FET input, the phase inversion between the two is part of the tonal difference.

[sepulchre]

Hey Tony, is that your rig? (looks nice!)

[steve_p]

Hey Tony, is that your rig? (looks nice!)

I think that is Robben's rig.
That is definitely the "green light" dumble

[JHP]

If we look at Robbens rig and how he sets it up,
http://www.youtube.com/watch?v=jzVq9JsBLsI
In this type stereo setup he needs to pay attention to phasing issues...So it makes sense for him to use a phase reversed cable to be in phase with his Super when he runs them together and in Stereo!!!..Here is why..
Since the Amp and Lator have an odd number of gain stages (out of phase with the input) and he runs his Super in the Reverb side (again odd number of gain stages) the Dumble would be out of phase with the Super (The super being in phase) coming out of his TC unit.. So if he wanted to run them both in phase (to get full Stereo effect)) with each other the logical thing would be to reverse the Dumble or use the Normal channel in the Super.....There it is...Interesting huh!!

Yep, that makes sence.

My second amp must be reversed phased as well because when I flip one I need to flip the other or they are noticably out of phase with eachother.

If RF's super or twin is in phase he would need to flip the dumble.

[fulltone1989]

Hey everyone! New poster and Fuchs ODS mod owner, I'm new to the reverse polarity idea so here's what I did.

Speaker + to Speaker wire -
Speaker - to Speaker wire +

Did I do that right? Sorry for the silly question.

Thanks!

[jelle]

Yes, that is correct.

[jelle]

I am grateful to Dumble that his overdrive circuit does not invert phase as compared to when it is switched out. Some amps do invert phase when channels are switched, which can be a mess if you care about such things.

True for all but the Ripper voiced ODS.

[fulltone1989]

Yes, that is correct.

Thank you! Sounds fuller and the feel is different. I dig it. When running 2 1-12" cabs they should both be wired out of phase, correct?

[jelle]

Yes, make sure they are matched.