• Vented diaphragm.
• Wooden air chamber.
• UHPLC copper voice coil wire.
• HPLC copper connecting cord.

Product Description ------------------- ------------------- Product Description ------------------- --> From the Manufacturer --------------------- --> Grado Reference Series RS1i Headphones -------------------------------------- The RS1i uses new upgraded dynamic transducers and the new 8 conductor cable design all in an open-air configuration. A masterpiece of the Grado collection, the beautiful 'retro' styling of the RS1i headphone is perfectly complemented by its handcrafted, real mahogany earpieces. However don't be mislead into thinking Grado have used this luxurious natural material purely for its striking visual impact. That's absolutely not the case. These carved hardwood enclosures are subjected to an intricate curing process which enables Grado to perfectly optimise the earpiece's tonal quality. This, combined with new upgraded dynamic transducers and their new 8 conductor cable design, result in a smooth, controlled and coherent sound with ultra-detailed dynamics. The frequency response ranges from 12Hz - 30kHz and the drivers are matched to 0.05dB. Light and comfortable, they weigh just 255g. The handcrafted mahogany earpieces are made using an intricate curing process. The result is superb tonal quality, free from unwanted resonance. Grado Headphones, Better By Design ---------------------------------- All Grado headphones have a vented diaphragm design that incorporates a large air chamber. This design concept lowers the frequency resonance (distortion) of the diaphragm and extends bass response. The diaphragm is made of a low mass polymer, carefully formed to broaden resonant modes to reduce their amplitude. The diaphragm mass is determined with the compliance of the suspension in mind so that the desired low frequency resonance is achieved. The Professional, Statement, Reference Series, and along with the Prestige Series (SR325is, SR225i and SR125i), feature voice-coils that are wound from ultra-high purity, long crystal (UHPLC) oxygen-free copper. The copper is slowly drawn through the die in extremely small increments and is annealed following each drawing operation. Ultra-high conductivity copper yields the clearest transmission and lowest colouration possible. The sound of UHPLC copper is smoother, cleaner and more dynamic. All use very high power neodymium magnets to provide maximum efficiency and better sound. Each headphone driver is made to Grado's high standards, then pair-matched for exact imaging. These headphones also utilise UHPLC copper in the connecting cable. Technical refinements for Grado drivers include improved diaphragm and voice coil design for increased bass response and a larger perceived sound stage. A unique process to "de-stress" the diaphragm results in enhanced inner detail. An increased ability to control driver resonance virtually eliminates distortion. For all models, an improved headband spring will afford greater comfort for the majority of listeners. The Grado Sound --------------- Grado headphones can reproduce as natural a soundstage from stereo s and provide as much listening pleasure as a good pair of speakers do. Grado headphones are free of room effects and placement problems, and they minimise any interference from external noise. They also offer portability and the ability to listen without worrying about the neighbours. With Grado headphones, you will hear s with greater clarity and with deeper bass than others. Grado headphones are the antithesis of mass production, as each Grado headphone is hand-assembled and closely scrutinised to meet full performance specifications in the U.S.A. The Grado story started in 1953 with the production of high-end phono cartridges. The Grado Story --------------- Grado is one of the oldest family owned companies in the audio industry. For more than half a century it has been a leader in design engineering for the high-end audio and industries. Grado is famous for their remarkable headphone and phono cartridge designs and hold over 48 patents. Company founder, Joseph Grado is credited as the inventor of the stereo moving coil phono cartridge. He is responsible for more innovations in phono cartridge design than any other person in our lifetime and was inducted into the Audio Hall of Fame in 1982. The Legacy Continues... ----------------------- Joseph Grado has passed on the mantle of President to his nephew John Grado. John has risen from sweeping the floors of the factory as a twelve year old, to President and Owner of Grado Laboratories. Following on from Joseph Grado's accled designs, John has led the development of the Prestige, Reference and Statement Series of headphones and phono cartridges and the Professional Series of headphones. All of which have received world wide accl by the audio press. Compare Grado Headphones ------------------------ Grado Professional Series PS1000 ( /dp/B002SKKQZO ) Grado Professional Series PS500 ( /dp/B005W1BXC6 ) Grado Statement Series GS1000i ( /dp/B001BIQROS ) Grado Reference Series RS1i ( /dp/B00076VEG6 ) Grado Reference Series RS2i ( /dp/B0006DPMUO ) Frequency Response 5Hz – 50KHz 14Hz – 29KHz 8Hz – 35KHz 12Hz – 30KHz 14Hz – 28KHz Impedance 32 Ohms 32 Ohms 32 Ohms 32 Ohms 32 Ohms Weight 588g 344g 333g 260g 260g Vented Diaphragm Yes Yes Yes Yes Yes Air Chamber Hybrid Hybrid Wooden Wooden Wooden Box Contains ------------ 1 pair of RS1i headphones