![]() ![]() Warehouse describes the G12C as having “a punchy, dynamic low-end response coupled with a musically articulate top-end”, and we’d certainly agree with that. Combining the AC15’s prominent midrange with the extended bass and treble response of the G12C driver produces a rather special combination that enhances the AC15’s complex treble, smooths out the bottom-end and - when overdriven - balances the midrange grind for a more articulate solo sound. We tried the AC15 with a variety of single- coil and humbucking guitars, including our regular Duncan APS1-loaded Strat and a Les Paul loaded with Duncan PAF-alikes. The G12C gives the AC15 a more ‘boutique’ vibe that sits comfortably alongside other EL84-powered US exotica ![]() So, what difference does the Warehouse speaker make? We already know that the AC15C1 has a wide tonal range, with sparkling cleans from the famous Top Boost channel at lower-gain settings, through the elusive Vox chime that stamps its authority on any rhythm part, to fat mid-heavy compressed overdrives with that unique Vox Class A grind. The Warehouse driver also has a couple of decibels’ extra sensitivity and a much higher power rating, 75 watts compared with the Greenback’s 25 watts, probably not so critical on an amp that produces 15 watts. On paper at least, Warehouse’s G12C is a very different animal to the Celestion G12M Greenback, with a different cone formula, smaller-diameter voice coil and a much higher resonant frequency: 134Hz compared with the Greenback’s 75Hz. To add another variable, guitar speakers with corrugated-paper surrounds take several hours of use to loosen up before they produce their definitive sound. This is one of the common difficulties involved in swapping loudspeakers: you can burn the midnight oil poring over spec sheets, but until you have a loudspeaker plugged into your own amp, you won’t really know what it sounds like, because a speaker’s behaviour is largely dependent on the power stage topology, with biasing and negative feedback, output valves and the output transformer all affecting the result. Characteristics such as sensitivity (the amount of volume the speaker generates for a given amount of input power), frequency response and damping may alter things a lot - or sometimes not. SoundsĬhanging a loudspeaker can make a significant difference to the way a valve amplifier sounds and responds. The G12C loudspeaker on this limited-edition run comes from Warehouse’s American Vintage series and features a seamed cone, 1.5-inch voice coil and a 35oz ceramic magnet for full-on American tone. It’s built to the usual high standard we’ve come to expect from Vox, with neatly tied wiring and bright soldering, and looks robust enough to handle anything from weekend warrior gigs to full-on professional touring. Inside the chassis, most of the electronics are held on two printed circuit boards: a large one that holds most of the components including the control knobs, and a smaller one supporting the valve bases, which point downwards from the bottom of the chassis.
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