This beautiful 7" 8 ohm mid-tweeter has been fully tested and is functioning properly. There are no cracks, tears, or repairs. Phenomenal driver with incredibly rich history.
- Fully tested and performing at manufacturer's specifications.
Type 7" mid/tw
Nominal Impedance (ohms) 8
Minimum Power Recommendation (RMS) 25
Maximum Power Recommendation (RMS) 75
Maximum Peak Power Recommendation (RMS) 150
Voice Coil Diameter 1"
Length Of Wire On Voice Coil (meters) 8 (2 layers)
Voice Coil Wire Size #33
Voice Coil Wire Diameter .008"
Turns Of Wire On Voice Coil 100
Voice Coil Wire Round Copper With Custom High Temperature Baked Resin Coating
D.C. Resistance Of Voice Coil (ohms) 5Ω
Voice Coil Axial Length .375"
Electromagnetic Coupling Constant (Bl) 8.8
Effective Mass Of Voice Coil, Cone And Spider (grams) 21g
Effective Piston Diameter Of Cone 5.625"
Maximum Peak To Peak Excursion .062"
Free Field Resonance (Hz) 1500
Magnet Material And Structure Custom Coated Ceramic, D.C. Magnetized, Equalized Flux Module Structure (EFM)
Total Magnet Weight 5 lbs.
Flux Density (Weber/m2) 1.1
Recommended Frequency Range (Hz) 3000-20,000
The History of Hartley
Founded in 1927, by H.A. Hartley in London, England, Hartley coined the phrase "high fidelity". This was a noteworthy beginning for a company who would innovate and change the face of the loudspeaker industry forever. Hartley, with engineer P.K. Turner and ideas from Barker, Voigt, and Olson set out to manufacture...
[ Read More ]
In the past, very special people have known about HARTLEY speakers. Audiophiles, engineers, musicians, recording technicians, scientists and other professionals who use sound or consider sound to be a very important part of their lives or careers. No matter what the price, HARTLEY speakers are considered among the best available anywhere in the world. Meticulous hand-crafting and unique problem solving of the physics of loudspeakers are the reasons for our long standing reputation. We don't sell a lot of speakers that way, but we don't have to compromise our standards either. In fact some of our drivers require over fifty hand operations to build.