Hughes & Kettner QC 421, QC 412 Appendix, Enhanced HF Neodym Speakers, Tuned Resonance Cabinets

TM

Quantum -combo Manual

9. Appendix

9.1 Enhanced HF Neodym Speakers

All Quantum™ amps are loaded with advanced speakers sporting Neodym magnets. Not only does this technology reduce weight significantly, it also creates a more concentrated magnetic field for improved impulse response. Speakers trigger faster and with greater precision, ensuring truer response to the player’s touch and enhan- cing loudness. Our developers developed these rigs to render the crucial overtone spectrum with utmost uniformity. The projection pattern of conventional amps’ high-frequency horns is a tight cone. Because these horns are driven by crossovers, phase shifting is in- evitable. This is why Quantum™ series loudspeakers were designed with integrated HF systems. While the 10" speakers use parallel membranes (that is, a dual cone design) to this end, the 12" and 15" woofers feature a completely new technology. A machined aluminum cone (DuraDome™) renders the voice coil’s high fre- quency output. Both of these technologies deliver true response,

a wide pattern of throw, and a rich overtone spectrum that blends perfectly with the main membrane’s low and midrange frequency response.

9.2 Tuned Resonance™ Cabinets

Many years experience designing, tuning and manufacturing loud- speaker enclosures enabled the Quantum™ development team to build cabinets that – like fine acoustic instruments - make the most of resonances. Intelligently engineered and arrayed panels and bracings, and the housing’s robust, six-ply okumé plywood (weighing about half as much as standard cabinet woods), deliver punchy low-end projection and finely balanced, crisp midrange resonance. Because the enclosure projects these resonances uniformly across its entire surface area, the bass signal can be localized precisely from any position on the stage.

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