Speaker Output Jacks - SWR 550x Owner's Manual

NOTE: The frequency response of the 550x is far greater than usually found in musical instrument
amplifiers (20 Hz to 40K Hz). This was engineered in order to give the bass player the same punch
and clarity on stage as found in the studio or concert P.A. systems. Therefore, it is doubly important
that you are aware of the impedance and power rating of the speakers that you intend to use, and
that they are compatible with the 550x. Speakers that have been overdriven are easy to detect and
generally do not fall under a manufacturer's warranty.

SPEAKER OUTPUT JACKS

Two 1/4" phone jacks and two Speakon Jacks (all wired in parallel) are provided for connection of the 550x to your speaker
system. Whenever possible, use of the Speakon jacks is recommended. Speakon jacks and connectors offer the best possible
connection and are far superior to banana or 1/4" phone jacks in that they not only lock in place (preventing accidental dis-
connection), but also offer a greater and more stable connection surface. This solid connection provides a more effective
transfer of power to your speakers.
Only SPEAKER CABLE of 18 gauge or heavier (the heavier the cable, the lower the gauge) should be used to connect your
550x to your speaker system. Do not use shielded instrument cable to connect your amplifier to your speaker enclosure, as
this can result in intermittent power loss, cause your amp to oscillate and damage itself and/or your speakers, and render the
cable useless for any purpose.
NOTE: Unlike some amplifiers on the market, the 550x can be used for recording purposes without
speakers attached to the speaker output jacks (using only the Balanced [XLR] Output).
Recommended single SWR Speaker enclosures for use with the 550x include:
Goliath III 4x10 (4 or 8 ohm versions)
Goliath Senior 6x10
Twelve-Stack 4x12
Big Bertha 2x15
Megoliath 8x10
Workingman's Tower 8x10
Recommended SWR Speaker combinations for use with the 550x include:
(2) Goliath III 4x10's (8 ohm versions)
(2) Goliath Junior III 2x10's (8 ohm version)
(2) Son Of Bertha 1x15's
(1) Goliath III 4x10 (8 ohm version) and (1) Son Of Bertha 1x15
(1) Goliath Junior III 2x10 (8 ohm version) & (1) Son Of Bertha 1x15
(1) Goliath Junior III 2x10 (8 ohm version) & (1) Big Ben 1x18
(1) Goliath III 4x10 & (1) Goliath Junior III 2x10 (8 ohm version)
(1) Twelve-Stack 4x12 and (1) Twelve-Pack 2x12
(2) Workingman's 4x10T's
SPEAKER FUSE
The speaker fuse is provided to protect your speakers in the unlikely event of a power amp failure or to protect your power
amplifier from incorrect speaker impedances or hookups. Size and rating of the fuse is 3AG, 10 amp, fast-blo. Do not defeat
the purpose of this feature by using a higher rated fuse as it can damage your amplifier and void your warranty.
The fuse can open as a result of a fault in the speaker cable, the speakers themselves, or the power amp being sent well into
clipping. With this in mind, it is wise to carry extra fuses at all times.
18 • 550x