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.)

POWER 750 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 han- dling capabilities of your speaker cabinets as compared to what the Power 750 can deliver at that impedance. Those ratings are as follows:

850 watts @ 2.6 ohms

750 watts @ 4 ohms

450 watts @ 8 ohms

So if you have two 8 ohm speaker cabinets, they will each get up to 375 watts of power, and more during transient peaks. A single 4 ohm cabinet will get up to 750 watts of power. Make sure your speaker cabinets can handle the horsepower!

This is even more crucial when running at the minimum impedance. When operating your Power 750 at 2.6 ohms, the combined power handling of your 4 ohm and 8 ohm cabinet had better be at least 850 watts. To be safe, each individual cabinet (especially the 4 ohm cabinet) should handle at least 500 watts. Don't guess or assume that your speaker cabinets can handle the power listed above - get the specs and make sure!

Also be aware that when running the Power 750 at 2.6 ohms, you are operating at the maximum capacity of the power amplifier. If you're sending too hot a signal from your preamp, and your Power 750 Volume control is set high as well, you may hear audible clipping of the power amp (and the +3 Red LED on the front panel should be glowing). If so, you have exceeded the maximum capacity of the power amp. Continual clipping of the power amp section can cause damage to the power amplifier and/or your loudspeakers.

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 Power 750 provides, either:

a)ask your bandmates to turn down

b)ask the monitor engineer to turn you up

c)(best option) take the time to investigate getting another external power amp and/or additional speaker cabinets to supplement your system

NOTE: The frequency response of the Power 750 is far greater than usually found in musical instrument amplifiers (20 Hz to 40 kHz). 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 Power 750.

Speakers that have been overdriven are easy to detect and generally do not fall under manufacturer warranty.

SPEAKER OUTPUT JACKS

There are two 1/4" jacks and two Speakon jacks provided for the output section of the Power 750. Make sure all speakers are properly connect- ed BEFORE turning on the Power 750 whenever possible. Generally it's a bad idea to plug or unplug your speakers while the unit is on.

SPEAKON VS. 1/4" JACKS

We have found the Speakon connection to be superior in both stability and amperage conductivity, and so we have provided Speakon output jacks in addition to the standard 1/4" jack. If using the Speakon output jack, we highly recommend the use of a Speakon-to-Speakon speaker cable, one of which is supplied with your unit. (All SWR Professional Series speaker cabinets manufactured after January of 2000 come equipped with Speakon input jacks.) If your speaker cabinet(s) does not have a Speakon input jack, you should use the 1/4" output jacks on the Power 750 and connect them accordingly. The Speakon jacks are wired "standard" (+1/-1) and additional Speakon-to-Speakon cables are available through most musical equipment retail outlets.

8 • POWER 750

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SWR Sound owner manual Power 750 Power Delivery Capabilities Power Ratings, Speaker Output Jacks, Speakon VS /4 Jacks
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750 specifications

The SWR Sound 750 is a powerful and versatile bass amplifier that has garnered a solid reputation among musicians and sound engineers for its exceptional performance and reliability. Ideal for both live settings and studio recordings, the SWR Sound 750 blends cutting-edge technology with user-friendly design, making it a top choice for bassists of all levels.

One of the standout features of the SWR Sound 750 is its impressive power output. This amp delivers 750 watts of pure power at 4 ohms, ensuring that users can achieve a loud, punchy sound in any environment. The onboard power management system also optimizes the amplifier's performance, allowing for dynamic control and responsiveness to playing styles.

The SWR Sound 750 incorporates advanced tone-shaping technologies that enable musicians to sculpt their sound with precision. It features a 4-band EQ section, allowing for detailed adjustments to the high, mid, and low frequencies. This gives bassists the ability to enhance their tone, whether they are looking for a deep, rich low end or a bright, cutting high end. Additionally, a built-in compressor helps to smooth out the tonal inconsistencies, providing a consistent sound across various playing dynamics.

Versatility is another key characteristic of the SWR Sound 750. It includes multiple input options, catering to both active and passive bass guitars. The amp also features a balanced XLR line out for seamless integration into live sound systems, making it suitable for gigging musicians who require reliable connectivity and high-quality sound.

Durability is crucial in a performance environment, and the SWR Sound 750 is built to withstand the rigors of the road. The sturdy chassis and robust components contribute to its long-lasting performance, ensuring that it remains a reliable choice for touring musicians. Additionally, its lightweight design makes it easy to transport without sacrificing sound quality.

The SWR Sound 750 is more than just an amplifier; it is a comprehensive solution for bassists. With its powerful performance, advanced features, and rugged construction, this amplifier has established itself as a trusted choice for musicians seeking to elevate their sound in any scenario, be it on stage or in the studio. Whether you are playing in a small venue or a large concert hall, the SWR Sound 750 is designed to deliver powerful, professional-grade audio that enhances the overall performance.
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