The Optimus PRO LX5, despite its low-frequency limitations, produced a surprisingly balanced overall sound, with no obvious lack of bass. Undoubtedly this was because of its very healthy output between 100 and 500 Hz, which gives a good sense of the lower octaves without sounding boomy or unnatural. The speaker's wide, smooth, and well-dispersed middle-and high-frequency output distinguishes it from many others of similar size and price.
In A/B comparisons against other speakers of comparable size, the PRO LX5 easily held its own. When we teamed it with a good subwoofer, the combination was thoroughly satisfying, with the PRO LX5's own low-frequency rolloff nicely complementing the subwoofer's frequency range. Actually, the most interesting aspect of this combination was how little the subwoofer added to the system's sound. Only with programs containing strong, deep bass (under 50 Hz or so) was there any obvious difference in the sound when using the subwoofer.
The Optimus PRO LX5 is clearly an excellent value, and a lot of speaker for its size and price.

RadioShack Optimus Pro LX5 loudspeaker Specifications

Specifications

Description:
Two-way, stand- or bookshelf-mounted, reflex-loaded box loudspeaker. Drive-units: 5" polypropylene-cone bass/midrange; 2" by 4" Linaeum dipole tweeter. Measured crossover frequency: 4–5kHz. Frequency range: 85Hz–20kHz (no limits given). Measured sensitivity: 81.5dB/2.83V/m (B-weighted). Nominal impedance: 8 ohms. Amplifier requirements: 100W recommended maximum.
Dimensions:
10.5" (267mm) H by 6.375" (162mm) W by 6.5" (165mm) D. Weight: 7.5 lbs (3.4kg) each.
Serial numbers of units reviewed:
9A4 (both). RadioShack Catalog number: 40-4061.
Finish:
gray matte.
Price:
$299.98/pair. Approximate number of dealers: 6500.
Manufacturer:
RadioShack, A Division of Tandy Corporation, 1700 One Tandy Center, Fort Worth, TX 76102. Tel: (817) 390-3011. Fax: (817) 878-6508.
Web: www.radioshack.com.

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