Sherlock Audio's Speaker Mate
http://www.sherlockaudio.ca/
I have only gigged with this a couple of times and it was with an Ampeg B2RE Solid State head and 3 Ampeg cabs. Sounded good to me and nothing fried.
Here is the marketing BS..
SpeakerMate was designed to allow connecting a wide array of multiple, impedance matched speaker cabinet pairs as well as some mismatched impedance triple-cabinet setups to just about any amplifier available today. Through the use of Self-Switching-Topology, SpeakerMate allows a multitude of speaker hookups (scenarios) in series, parallel, series-parallel and parallel-series (or combinations of these) . SST also maintains an optimum load to the power amp in the event of a speaker failure. SST draws no other power from your amp than the draw from your present or future speaker additions. Immeasurable THD and virtually the same S/N ratio regardless whether Speakermate is connected to your system or not.
SpeakerMates compact design, eliminates the need for cumbersome, confusing, (which wire is which on a darkened stage?) spliced up, unreliable external wired bundles of spaghetti previously attempted to achieve some kind of similar results (often with near-disasterous conclusions) Who needs THAT hassle? With SpeakerMate, you can just plug in any standard ¼ plug terminated speaker cable and, available soon with Neutrik Speakon connectors for heavy duty applications.
SpeakerMate is also an invaluable tool for golden-eared guitarists. They can now evaluate the sonic differences imparted on their tone by allowing several combinations of speaker cabinets with various impedances to be used simultaneously on their tube amps. As well, in the recording studio, Speakermate can be used to audition several speaker setups in an effort to nail that Tone you want to record. An added benefit of Speakermate's clever design is a slightly enhanced warm, low-end response when connected to many of today's "dry" sounding digital power-amplifiers.
For guitar stores, SpeakerMate is a timesaver, allowing players to demo multiple speaker cabs on the same amp, at the same time, helping them in their quest for the right combination.
For musicians playing a number of different sized venues, SpeakerMate can be used to add that extra speaker cabinet to your amp and position it at the other of the stage so the guitarist can hear you (or vice versa!) . For smaller gigs, you can safely leave SpeakerMate connected to your present setup and when the need arises, just plug in and youre good to go.
SpeakerMates simply clever circuit design offers offers guitarists, bassists, sound operators & installers alike a multitude of speaker configurations from a choice of several different models presently available.
Time & time again, Speakermate has proven itself as an indispensable lifesaver, when a main power amp had gone down during a live performance. On a hastily called break, the disabled power would be set aside, its speakers would be reconnected , along with the secondaryspeakers, to the Speakermate & secondary amp that was still operational, allowing the performance to continue, with nary a hitch.
Speakermate has quickly become a standard must-have item in every musicians & soundmans gigbag of goodies (right next to the gaffer tape & spare mic clips!) to pull them out of a surprise like showing up at a gig & finding out theres only ONE supplied monitor amp for all OUR wedges? (Did anybody check the contract?) SpeakerMate to the rescue (literally) allowing up to SIX monitors to operate from one mono power amp.
in series, parallel, series-parallel and parallel-series (or combinations of these) . SST also maintains an optimum load to the power amp in the event of a speaker failure. SST draws no other power from your amp than the “draw” from your present or future speaker additions. Immeasurable THD and virtually the same S/N ratio regardless whether Speakermate is connected to your system or not.
