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Summary of Contents for Boulder 508
- Page 1 508 Phono Preamplifier 6/1/2018 Boulder Amplifiers, Inc. Rev. 1.0 255 S. Taylor Ave. Louisville, CO 80027 (303) 449-8220 P/N: 91053 www.boulderamp.com...
- Page 2 About About Boulder Amplifiers, Inc. Boulder was founded in 1984 and is the last high-performance audio manufacturer operating in North America to still perform all of its own design, engineering and manufacturing in-house. While this form of production may be more costly than outsourcing, the resulting quality control and reliability of the finished products are never compromised.
- Page 3 Please take a few moments to read through this instruction manual prior to using your 508. This will help you understand the many functions and capabilities of the phono preamplifier. It will also allow you to maximize the convenience and performance for which it was engineered.
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Page 4: Table Of Contents
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Placement and Installation of the 508 •... -
Page 5: Getting Started
Getting Started Introduction The 508 Phono Preamplifier embodies years of development and is di- rectly descended from the legendary 2008 Phono Preamplifier, one of the greatest Phono Preamps ever developed. Here are some of the features that set the 508 apart from the competition: Audio features: •... -
Page 6: Unpacking And Care
The 508 Phono Preamplifier weighs 11.5 lbs. (5.2 kg). Be sure to save all packing materials! The 508 is shipped in a foam wrap to protect the phono preamplifier’s fine finish. Try not to damage this wrap in the event that the unit must be transported elsewhere in the future. -
Page 7: How To Clean The Casework
Be sure to leave access to the AC mains and interconnect cables when installing the phono preamplifier. Depending on how easy it is to access the back panel of the 508, it may be wise to pre-install the power and interconnect cables before placement. -
Page 8: Turntable Connection Types
Getting Started Turntable Connection Types To get started listening, you only need to connect a turntable to the 508 as you would any other phono preamplifier. Please take note of the following: The 508 can be connected to many different types of analog turntables and will provide excellent sound quality for each. -
Page 9: Connecting A Turntable
Boulder ABL2 input adaptor or any other “standard” RCA phono to XLR adaptors. These are not intended for phono use, as they short pin 1 to pin 3 and will cause hum in your system. Only use the Boulder PHRCA Phono Adaptors. -
Page 10: Connecting The Outputs To A Balanced Preamplifier
Getting Started Connecting the Outputs to a Balanced Preamplifier With the low output impedance of the 508 Phono Preamplifier, distances of more than 50 meters between the 508 and preamplifier are practical. Connect the LEFT and RIGHT OUTPUT interconnects from the 508 to your preamplifier. -
Page 11: Connecting The Outputs To An Unbalanced Preamplifier
Use an ohmmeter or continuity checker to determine how your cable is wired. NOTE: The 508 Phono Preamplifier conforms to the standard of pin 2 as high or “hot” for all balanced analog inputs and outputs. UNBALANCED OUTPUT CABLE... -
Page 12: Moving Coil Or Moving Magnet Selection
Connect the AC power cord to the AC Power Input connection on the rear panel of the 508 as shown and plug the other end into the AC mains outlet. AC Mains... -
Page 13: Operation
With all of your connections made, you are now ready to listen to your Boulder 508 Phono Preamplifier. To turn the 508 ON, move the large Power Switch located on the front panel upwards. The small LED above the Power Switch will turn white and the 508 will automatically unmute when it is ready for listening. -
Page 14: Equalization
To temporarily mute the output, press the front panel MUTE button. When the 508 is in Mute mode, the small LED above the Mute button will illuminate amber. -
Page 15: Appendix
Appendix Technical Specifications Balanced Inputs 1 x 3-pin balanced XLR Balanced Outputs 1 x 3-pin balanced XLR Maximum Output Level 16 Vrms Distortion, THD 0.01% 1 kHz Gain, RIAA MC: 70 dB, MM: 44 dB Noise (EIN), MC 116 nanovolts flat, 20 Hz to 20 kHz Frequency Response, 20 Hz to 20kHz RIAA: ±0.50 dB, 20Hz to 20kHz Low Cut Filter... - Page 16 Appendix Weights and Dimensions 508 Phono Preamplifier Chassis: 11.5” W x 9.45” D x 2.3” H (11.5 lbs.) 29.2 cm W x 24 cm D x 5.8cm H (5.26 kg) Shipping: 18” W x 20” D x 5” H (16 lbs.) 45.7 cm W x 50.8 cm D x...
- Page 17 Appendix 508 Phono Preamplifier Dimensions (Inches) .250 .289 R .500, 2 PL .250 .289 R .500, 2 PL R .500, 2 PL 9.200 9.200 BOULDER AMPLIFIERS, INC. R 1.500, 2 PL 508 PHONO PREAMPLIFIER OUTSIDE DIMENSIONS R 1.500, 2 PL .109...
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Page 18: Troubleshooting
Defective 508 Return 508 to dealer for service Red LED indicator 508 is Muted Press Mute button to take 508 out of Mute mode Phono preamplifier is booting Wait until boot process completes Defective power supply Return 508 to dealer for service... - Page 19 Appendix Notes:...
- Page 20 Appendix Notes:...
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