Matthew Polk himself often praised the 7 as the better in the Monitor series in interviews. Specs- Frequency response- 25 Hz to 25 KHz, 40Hz at lower -3db limit, 23KHz at upper -3db limit. Recommended amplifier power- 20wpc to 150wpc efficiency- 89 db Impedance- 8 ohms size- 24" tall by 13" wide by 10" deep. 33 lbs each. Polk still supports it's products, and if ever the durable and well-built speakers ever need replacement parts, they are still available from Polk.