Description: Two-way, reflex-loaded, floorstanding loudspeaker. Drive-units: ¾" fabric-dome tweeter, 7" carbon-fiber–impregnated paper-cone midrange/woofer. Impedance: 8 ohms nominal. Sensitivity: 86dB/W/m.
Dimensions: 42" H by 83/4" W by 10" D.
Serial numbers of pair reviewed: P 07563.
Price: $4500/pair (1996); no longer available (2005). Approximate number of dealers: 35.
Manufacturer: ProAc, Highpoint House, Riding Road, Buckingham Road Industrial Estate, Brackley, Northamptonshire NN13 7BE, UK. Tel: (44) 1280-700147. Fax: (44) 1280-700148. US…
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Sidebar 1: Specifications
Sidebar 2: Measurements
You don't get something for nothing, and the price to be paid for the Response 2.5's impressive bass extension is a low sensitivity: I calculated 2.83V to raise just 83dB (B-weighted) at 1m, which is hardly more sensitive than an LS3/5a! The speaker is easy on the partnering amplifier, however, as its impedance (fig.1) only drops below 8 ohms in the lower midrange, and then not by much. The tuning of the 2.5's reflex port is revealed by the impedance "saddle" at 38Hz in this graph.
Fig.1 ProAc Response 2.5, electrical impedance (solid) and phase (…
Consider the fate of Giordano Bruno, a 16th-century astronomer who challenged Ptolemy's notion of Earth being the center of a finite universe—and in doing so went head to head with the church of Rome. Bruno's scholarly diligence and fearlessness were rewarded not with fame, riches, or accolades from his colleagues, but with a hot-lead enema, after which he was burned at the stake. Next heretic in line, step right up, please.
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Mark S. Doss, Patricia Schuman, Ana Maria Martinez, Suzanna Guzmán, Hector Vasquez, Oren Gradus, Chad Shelton; Houston Grand Opera Orchestra & Chorus, Patrick Summers
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