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Hard Bop Academy Book
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This instrument or product has been carefully played/used and returned to us in
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our 60-Day Satisfaction Guarantee on instruments and 30 days on accessories applies to this used product.
This instrument or product is in good working condition but has one or more cosmetic
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applies to this used product.
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Accidental damage, normal wear and power surges are no longer an issue with these comprehensive and affordable plans. We even pay to ship your gear for repairs. More details.
Covers much more than the original manufacturer's warranty:
Limit of Liability: The least of the cost of (1) authorized repairs, (2) replacement with a product of similar features, (3) reimbursement for authorized repairs or replacement or (4) the price that you paid for the product.
*Limitations and exclusions apply. See terms and conditions for program details
Electro-Voice Q44 II Power AmplifierThe Q44 II power amp from Electro-Voice provides 2 x 450W @ 4 ohms or 2 x 650W @ 2 ohms. It's an excellent choice for small tops and utility loudspeakers, such as ZX1, SX Series, or EVID Series.Dynamic Headroom:Electro-Voice's philosophy is that tonal performance of live music counts most; therefore, Electro-Voice amps are designed for dynamic headroom, meaning that each and every EV amp—including the Q44 II—has at least 30% more output capability for short-term signals when compared to a long-term sine wave value. This additional headroom results in an amp that will, for example, allow for short term signal peaks of at least 780W when spec'd 600W. While dynamic headroom is audible when playing music through a sound system, another specification to observe is the increase in output power from an 8-ohm load to 4 ohms, and then down to 2 ohms. Of course, all EV power amplifiers are designed to be absolutely stable into loads of 2 ohms. Innovative Class-H powerWith Q Series' efficient Class-H design, the permanent voltage rail is designed to cover the average music signal, rather than permanently supplying the voltage for maximum output power. If dynamic peaks require a higher output voltage, the voltage rail is switched to the maximum. This process saves up to 50% of the power consumption found in conventional amplifier design, and results in a dramatic reduction in heat output. The EV Q44 II and other power amps from the Q Series combine the sonic excellence and ruggedness of its Precision Series predecessors with Class-H innovation, all in a compact and affordable package.Transient Response:When processing dynamic signals, other important criteria are signal speed and dynamic distortion. For example, kick drum signals carry pulses of many frequencies as an overlay spectrum. Therefore, and in contrast to many other manufacturers, Electro-Voice specifies a lot more information on their amplifiers' dynamic behavior than just "slew rate" figures. Important tests referring to the amp's ability regarding multitone signal pulses are expressed by IMD-SMPTE measurements at high power levels. And, while IMD tests show the Intermodulation Distortion behavior (how much "sound" is added by the amplifier), DIM30 is the real spec for speed in an amplifier. All these tests are carried out in EV labs during an amplifier's design phase, to ensure maximum sonic performance. While these technical explanations appear very complex, they are clearly audible. Take a the Q44 II amplifier and crank it up—you'll hear the difference immediately.Protection Package and Dynamic LimiterQ Series amplifiers benefit from decades of professional amplifier design, and all the expertise that has made EV amps the concert/touring standard is built into Q Series power amplifiers. This complete protection package includes sophisticated circuits against overheating, short circuit, DC output voltage, HF oscillation, back EMF (Electromotive Force), and destructive peak current. Furthermore, Q Series amps also protect your valuable loudspeakers with built-in dynamic limiters, preventing dangerous output clipping. The limiters immediately reduce amp gain when dynamic headroom is pushed to the limits at maximum output, keeping distortion below 1% in a situation that can otherwise cause a signal to clip, which is often fatal for woofers and drivers.
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