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INTRODUCTION
Congratulations on your purchase of the SWR 350x Bass Amplifier! You now own the cornerstone amp of
SWR’s world-renowned Professional Line of products for bassists.
A little history: The SWR 350x is an upgraded version of the Bass 350, a model we’ve offered for over ten
years as a simple and straightforward solution for bassists who wanted the famous “SWR Sound" in the
simplest Professional Line package possible. Our top-selling Professional Line head for several years run-
ning, the Bass 350 featured a tube preamp (using a specially-selected 12AX7A vacuum tube), SWR’s
patented “Aural Enhancer,” an easy-to-use 3-band EQ section, and a high-quality, discrete solid-state 350-
watt power amp capable of delivering enough power and headroom for most live applications. With a
proven track record among players of all levels, the Bass 350 has become a constant presence in live
venues and studios alike.
The new 350x maintains all of these proven features while adding significant improvements. We’ve inte-
grated a new feature: our SubWave™ circuit, which produces a tone an octave below the original signal
and tracks as well or better than anything else on the market today. (The effect is foot-switchable, and
we’ve provided a footswitch for your convenience.) The XLR (Balanced) output circuit has been upgraded to
include a variable pad, and is quieter in terms of signal-to-noise ratio. Additionally, the unit is now lighter,
quieter (in terms of overall residual and white noise), and in our humble opinion, better-looking thanks to a
cosmetic rework from the ground up. And, of course, each 350x is still assembled by hand and individually
sound-tested in the USA at our factory in Southern California.
It’s all part of SWR’s commitment to continued improvement and refinement of even our most popular
models, so that we can continue to assist today’s bassist in the pursuit of the ultimate goal: finding equip-
ment that not only does the job, but actually enhances the overall musical experience and contributes to
the creative process. Everyone here at SWR sincerely hopes that the purchase of your 350x helps you get
there from here… and beyond.
Please take the time to read your User Guide thoroughly and completely, so that you can realize the full
potential of your new 350x Bass Amplifier. Once again, thanks for your purchase, and for letting SWR help
Amplify Your Future™.
Sincerely,
SWR
350x OWNER’S MANUAL • 1