Charter Oak Acoustics SP-1 Professional Studio Headphones

The Charter Oak SP-1 is an acoustically closed headphone for studio use and music production built exclusively for Charter Oak by German manufacturer MB Quart.  
The Charter Oak SP-1 headphones unique features include: Five-dimensional "CARDAMATIC" ear cup suspension that ensures a comfortable, individual fit regardless of head size and prevents body noise effects from infiltrating the ear cups; comfortable, "Gentle to the skin" hygienic ear pads provide excellent insulation from outside noise without affecting wearer comfort over long periods of time; high-quality drivers featuring ultra-light sandwich diaphragms and copper-plated aluminum voice coils; good rejection of outside noise, extended frequency response and perfect detail. All of these features make the SP-1 appropriate for over-dubbing and mixing.  
The Charter Oak SP-1 is delivered in a handsome black, piano type finish box and Charter Oak's Lifetime Warranty.  
Charter Oak SP-1's specifications

•   Frequency Response 14 Hz - 24.1 kHz
•   Impedance 2 x 300 Ohms
•   5 dimensional cardamatic ear cup suspension
•   Closed design rejects outside noise making the headphone appropriate for overdubbing in the studio
•   Excellent frequency response, imaging, and overall accuracy make the headphone appropriate for mixing tasks
•   Extreme comfort for long hours of overdubbing and mixing