SWR Sound owner manual 350x Power Delivery Capabilities Power Ratings, Speaker Output Jacks

One 8 ohm enclosure + one 8 ohm enclosure = 4 ohms total impedance

One 4 ohm enclosure + one 4 ohm enclosure = 2 ohms total impedance

One 8 ohm enclosure + one 4 ohm enclosure = 2.6 ohms total impedance

Here’s another formula: To figure out the total impedance of two or more cabinets of equal value hooked up in parallel, divide the impedance of one cabinet by the number of cabinets:

Impedance of one cabinet / number of cabinets = total impedance

(For an even more in-depth discussion of impedance and power rating issues, go to the SWR Website at: www.swrsound.com, click on “Press,” then click on “Articles,” then click on “Plug and Play – Setup Tips for Amps and Speakers” – an article by SWR founder Steve Rabe that ran in the August ’92 issue of Bass Player Magazine.)

350x Power Delivery Capabilities (Power Ratings)

After determining how the number of cabinets you wish to run affects the total operating impedance, you need to take into account the power handling capabilities of your speaker cabinets as compared to what the 350x can deliver at that impedance. Those ratings are as follows:

450 Watts @ 2 ohms

400 Watts @ 2.6 ohms

350 Watts @ 4 ohms

240 Watts @ 8 ohms

So if you have two 8 ohm speaker cabinets, they will each get up to 175 watts of power, and more during transient peaks. A single 4 ohm cabinet will get 350 watts of power, and again, more during peaks. Make sure your speaker cabinet(s) can handle the power.

Also be aware that when running the amp at 2.6 or 2 ohms, you are operating at or near the maximum capacity of the power amplifier. With extreme settings on the Gain and Master controls and the Limiter cir- cuit disengaged, you may hear audible clipping of the power amp. If so, you have exceeded the maximum capacity of the power amp. POWER AMP CLIPPING CAN CAUSE DAMAGE BOTH TO ITSELF AND YOUR SPEAKER CABINETS. Either re-engage the Limiter (by pushing in on the Effects Blend control) to help smooth out the peaks, or back off on the Gain and Master controls.

Remember, it’s always better to have a little too much power than just barely enough. If you find yourself constantly wanting more power than the 350x provides, either:

a)Tell your bandmates to turn down;

b)Tell the monitor engineer to turn you up;

c)(best option) Take the time to investigate getting an external power amp and/or additional speaker cabinets to supplement your rig.

Question: Can you safely daisy-chain an 8 ohm speaker cabinet and a 4 ohm speaker cabinet together even though they have different impedances? Yes, but one speaker cabinet will get more power—and be louder—than the other. Since your 350x is a mono amplifier, it is best to use cabinets of similar imped- ances when using more than one. The best two-cabinet setup is to use two 8-ohm enclosures.

NOTE: The frequency response of the 350x 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 impor- tant 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 350x. 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 350x 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 disconnection), but also offer a greater and more stable connection surface. This solid connection provides a more effective transfer of power to your speakers.

350x OWNER’S MANUAL • 13