Rogers LS3/5a The Rogers LS3/5a speakers are a product of one of the few BBC licences British firms, who first manufactured the LS3/5a speakers in 1975. These monitors were designed as near-field monitoring with a frequency range from 400 Hz to about 20 kHz for mobile broadcasting vans. This pair of LS3/5a monitors are not a matched pair and show some signs cosmetic wear but are both in working condition and sound great. Please see images. Specifications Max SPL: 95dB Impedance: 11 ohms Frequency response: 70Hz - 20kHz Recommended Amp power: 25-100 watts per channel Hight: 12" Width: 7.5" Depth: 6.5" Weight: 5.5Kg