Summary of Contents for Sphere MP-1 Mk.3.3
- Page 1 1742 Selby Av. St. Paul, MN 55104 6516902246 atmasphere.com ATMA-SPHERE MUSIC PREAMPLIFIER model MP-1 Mk.3.3 OWNER'S MANUAL Please study this document carefully before using equipment RoHS...
- Page 3 Please read the manual carefully and follow the instructions closely. If you have any questions, do not hesitate to contact your dealer and always feel free to contact us at ATMA-SPHERE MUSIC SYSTEMS. Here's to many years of happy listening!
- Page 4 LIMITED WARRANTY ON ATMA-SPHERE MUSIC SYSTEMS PRODUCTS This warranty on your ATMA-SPHERE MUSIC SYSTEMS product, which is distributed and warranted by ATMA-SPHERE MUSIC SYSTEMS, shall remain in effect for three (3) years from the date of consumer purchase, provided the enclosed registration form is completed and returned to ATMA-SPHERE MUSIC SYSTEMS within ten days of purchase.
- Page 5 The MP-1 supports the use of a low impedance (600 ohm) load at the input of the power amplifier (although it is by no means required). Such practice can reduce hum and buzz but more importantly eliminate artifact from the interconnect cables. An optional terminator is available from ATMA-SPHERE for...
- Page 6 On the other hand, the input cables may be very critical, depending on the source. Atma-Sphere offers a variety of interconnect cables for this purpose. Contact your dealer or Atma-Sphere for details.
- Page 7 cartridge directly at audio frequencies. For best results, the phono cable should be shielded. Note: To avoid noise, avoid New Old Stock (NOS) 12AT7 tubes in the phono section. Most are far too noisy to be of any real use. The tubes closest to the rear panel have the most affect on the noise floor.
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Page 8: Troubleshooting Tips
If this is not possible, a specialized balanced-to-unbalanced subwoofer-optimized line transformer is available from Atma-Sphere and works quite well. If you do not use one of these techniques, it is likely that you will encounter a buzz. - Page 9 Benz. There are of course many others. If a high output cartridge is used, a jumper plug that replaces one of the phono tubes can be installed to reduce gain. Contact Atma-Sphere for details. A moving coil step-up transformer option is also available for cartridges of less than 0.1mV.
- Page 10 WARRANTY REGISTRATION FORM IMPORTANT: This form must be filled out and returned to ATMA-SPHERE MUSIC SYSTEMS within 10 days of purchase to validate the warranty! Please type or print clearly. NAME__________________________________________________________________________ Address_______________________________________________________________________ City or town ____________________________________State______zip code__________ Country_______________________________________________________________________ Name of dealership____________________________________________________________ MP-1 Mk.
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