“ Prologue: Hello everyone, here is a review of a new competitor on the market of high end custom headphones! The recently established "company" Martin Custom Audio ran by the one and only, you guessed it, Martin! You may have followed some of his other projects here on head-fi, building suspiciously good looking bits and pieces for grado headphones out of wood. Now he considered to share...” --VictorHalgaard
“ Presentation: Upon initial receipt of these headphones, you immediately feel as though Marty has made them especially for you – because he did. Marty of Martin Custom Audio does do lines of headphone modifications, but in small quantities and your item, such as this pair of SR-325i Grados is just that – custom and features a serial number. In the case of this particular...” --wje
High-end offering from German headhpone company 'Manta' (manufactured by Calrad Imports Inc.*) in 1974. *Reference Needed Impedance Rating in Ohms 4.0 minimum and 16.0 maximum Frequency Response Range Hz 30.0 to 15000.0 Headset Cord Length 84.0 inches nominal Earphone Element Type Dynamic Earphone Cushion Material ...