SHELFORD 775-000405254 Diode Bridge Compressor Instruction Manual

SHELFORD 775-000405254 Diode Bridge Compressor

Product Specifications

• Product Name: Shelford Diode Bridge Compressor
• Manufacturer: Rupert Neve Designs LLC
• Class: Class B digital device
• Compliance: FCC Rules Part 15

Product Usage Instructions

Safety Instructions:

1. Read and keep these safety instructions.
2. Heed all warnings provided with the equipment.
3. Follow all the instructions for safe usage.
4. Avoid using the apparatus near water to prevent electrical hazards.
5. Clean the equipment only with a dry cloth to prevent damage.
6. Ensure ventilation openings are not blocked during installation.
7. Avoid placing the equipment near heat sources like radiators or stoves.
8. Do not modify the plug for safety purposes.
9. Protect the power cord from damage.
10. Use only manufacturer-specified attachments/accessories.
11. Unplug during lightning storms or when not in use for extended periods.

Installation Instructions:
Follow the manufacturer’s instructions for proper installation, ensuring compliance with safety guidelines. Avoid obstructing ventilation and maintain a safe distance from heat sources.

Operation Guidelines:
Operate the Shelford Diode Bridge Compressor according to the provided manual. Ensure proper power supply and avoid exposure to extreme noise levels to prevent hearing damage.

Frequently Asked Questions (FAQ)

• What should I do if the equipment causes interference with radio or television reception?
  If interference occurs, try turning the equipment off and on. If the issue persists, consult a professional for assistance in resolving the interference.

• Can I use accessories not specified by the manufacturer?
  It is recommended to only use attachments and accessories specified by the manufacturer to ensure optimal performance and safety of the product.

Important Safety Instructions

1. Read these instructions.

2. Keep these instructions.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this apparatus near water.

6. Clean only with a dry cloth.

7. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.

8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.

9. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding-type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.

10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.

11. Only use attachments/accessories specified by the manufacturer.

12. Use only with a cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.

13. Unplug this apparatus during lightning storms or when unused for long periods of time.

14. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

15. This apparatus shall not be exposed to dripping or splashing, and no object filled with liquids, such as vases or beer glasses, shall be placed on the apparatus.

16. Do not overload wall outlets and extension cords as this can result in a risk of fire or electric shock.

17. This apparatus has been designed with Class-I construction and must be connected to a mains socket outlet with a protective ear thing connection (the third grounding prong).

18. This apparatus has been equipped with a rocker-style AC mains power switch. This switch is located on the rear panel and should remain readily accessible to the user.

19. The MAINS plug or an appliance coupler is used as the disconnect device, so the disconnect device shall remain readily operable.

    • The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure, that may be of sufficient magnitude to constitute a risk of electric shock to persons.
    • The exclamation point within an equilateral triangle is intended to alert the user of the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.
    • This symbol indicates that this product must not be disposed of with other waste. Instead, it is your responsibility to dispose of your waste equipment by handing it over to a designated collection point for the recycling of waste electrical and electronic equipment. The separate collection and recycling of your waste equipment at the time of disposal will help conserve natural resources and ensure that it is recycled in a manner that protects human health and the environment. For more information about where you can drop off your waste equipment for recycling, please contact your local city recycling office or the dealer from whom you purchased the product.

20. NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

    • Reorient or relocate the receiving antenna.
    • Increase the separation between the equipment and the receiver.
    • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
    • Consult the dealer or an experienced radio/TV technician for help.
      CAUTION: Changes or modifications to this device not expressly approved by Rupert Neve Designs LLC, could void the user’s authority to operate the equipment under FCC rules.

21. This apparatus does not exceed the Class A/Class B (whichever is applicable) limits for radio noise emissions from digital apparatus as set out in the radio interference regulations of the Canadian Depar tment of Communications.
    ATTENTION — Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant las limites applicables aux appareils numériques de class A/de class B (selon le cas) prescrites dans le réglement sur le brouillage radioélectrique édicté par les ministere des communications du Canada.

22. Exposure to extremely high noise levels may cause permanent hearing loss. Individuals vary considerably in susceptibility to noise-induced hearing loss, but nearly everyone will lose some hearing if exposed to sufficiently intense noise for a period of time. The U.S. Government’s Occupational Safety and Health Administration (OSHA) has specified the permissible noise level exposures shown in the following chart. According to OSHA, any exposure in excess of these permissible limits could result in some hearing loss. To ensure against potentially dangerous exposure to high sound pressure levels, it is recommended that all persons exposed to equipment capable of producing high sound pressure levels use hearing protectors while the equipment is in operation. Ear plugs or protectors in the ear canals or over the ears must be worn when operating the equipment in order to prevent permanent hearing loss if exposure is in excess of the limits set forth here:
    Duration, per day in hours| Sound Level dBA, Slow

Response

| Typical Example
---|---|---
8| 90| Duo in small club
6| 92|
4| 95| Subway Train
3| 97|
2| 100| Typical music via head phones
1.5| 102|
1| 105| Siren at 10 m distance
0.5| 110|
0.25 or less| 115| Loudest parts at a rock concert

Rupert Neve Designs: Shelford Diode Bridge Compressor

Thank you for purchasing the Rupert Neve Designs Shelford Diode Bridge Compressor. We hope you enjoy using this product as much as we have enjoyed designing and building it. The Shelford Compressor features custom Rupert Neve Designs transformer-coupled inputs and outputs, Class-A analog signal paths, and full-wave rectifi-cation in the compressor sidechain.

Shelford Compressor Block Diagram

Shelford Compressor Front Panel

Shelford Compressor Rear Panel

Shelford Compressor Front Panel Features

THRESHOLD
The THRESHOLD control is a 31-detent potentiometer that allows the user to adjust the point at which compres-sion occurs, between -25dBu and +20dBu. Turning this control counter-clockwise will increase the amount of compression; turning it clockwise will decrease the amount of compression. If the input signal is lower than the set threshold, no compression will occur.

RATIO
The RATIO control is a 6-position rotary switch that allows the user to set the slope of the compressor curve, rang-ing from 1.5:1 through 8:1.

TIMING
The TIMING control is a 6-position rotary switch that allows the user to manipulate the attack and release times of the compressor simultaneously. Each TIMING setting has a different attack and release time range associated. Due to the nature of this topology, these time constants will adapt based on several factors: compression ratio, threshold, and source material. It is recommended to experiment with different combinations of RATIO, TIMING, and THRESHOLD settings to achieve the desired result.

GAIN
The GAIN control is a 31-detent potentiometer designed to add make-up gain to compressed signal in order to match the compressed signal level with the input signal level.

BLEND
The BLEND control is a 31-detent potentiometer that allows the user to adjust the ratio of the compressed (wet) signal with the uncompressed (dry) signal to achieve parallel compression. Turning the BLEND control fully count-er- clockwise shifts the mix toward the fully dry, uncompressed signal. Turning the BLEND control fully clockwise shifts the mix toward the fully wet, compressed signal.

FAST
The FAST illuminated push-button switch speeds up the attack and release times on the TIMING control by 30%, effectively doubling the range of TIMING settings made available to the user.

LINK
The LINK switch engages stereo link mode. In stereo link mode, the compressor channel that is applying the most gain reduction will control the other channel in order to maintain a properly balanced stereo image.

COMP IN
This illuminated push-button engages both channels of the compressor, enabling the user to make quick A/B comparisons.

S/C HPF
The side-chain high-pass filter employs a 12dB/octave filter that allows the user to control the amount of low fre-quency energy that hits the compressor side-chain. The 31-detent HPF potentiometer is continuously variable from 20Hz to 250Hz. The side-chain HPF is engaged when the S/C HPF push-button switch is set to the IN position.

S/C INSERT
This push-button switch enables the S/C INSERT SEND and RETURN jacks on the rear-panel of the compressor. This allows the user to patch in additional external processing gear into the compressor side-chain (such as an external EQ). The side-chain insert level is -3dB referenced to the input level.

VU SELECT
These push-button switches toggle the VU meter displays between compressor output level and compressor gain reduction. VU Reference Standard: 0VU = +4dBu

PEAK LED
The Peak LED will illuminate RED in order to warn the user that the output stage signal level is peaking 3dB below clip point.

VU METER ENDSTOP ADJUST
PLEASE NOTE: The recessed black adjusters below the VU meters come factory trimmed and should not need further adjustment. These adjusters allow for VU meter needle bottom endstop calibration (one tick mark below -20 VU).

Shelford Compressor Rear Panel Features

POWER
IEC standard 3-pin grounded AC power inlet with power switch. 100-240VAC 50/60Hz input range with a maxi-mum power consumption of 45W.

LINE INPUT
Neutrik XLR combo jack line input utilizing custom Rupert Neve Designs transformer-coupled, balanced inputs. Maximum input signal level is +26.7 dBu at 1kHz.

LINE OUTPUT
Neutrik XLR jack line output utilizing custom Rupert Neve Designs transformer- coupled, balanced outputs. Maxi-mum output signal level is +26.7 dBu at 1kHz.

S/C INSERT SEND & RETURN
Neutrik TRS jacks utilized for compressor side-chain insert. These jacks are enabled by pressing the S/C INSERT push-button switches located on the front panel. A 1/4” TS cable should be used to make patches to and from external processing gear. The side-chain SEND jack should be connected to the INPUT of the external processor (EQ). The side-chain RETURN jack should be connected to the OUTPUT of the external processor.

GROUND LIFT
The ground lift switch can be used to interrupt a ground loop if encountered in the studio environment. In the LIFT position, Pin 1 of the XLR line outputs are disconnected from chassis ground.

Shelford Compressor Specifications

• XLR Line Input to XLR Line Output (Compressor Bypassed) ZSOURCE= 40 Ω Balanced

  • Input Impedance 10 kΩ
  • Output Impedance 40 Ω
  • Maximum Input Level (+4 dBu Selected) +26.7 dBu typical
  • Maximum Output Level +26.7 dBu typical
  • Noise (22 Hz – 22 kHz BW) -104 dBu typical
  • Frequency Response (10 Hz to 120 kHz) +/- 0.25 dB typical
  • THD+N @1 kHz @ Maximum Level (22 Hz – 22 kHz BW) 0.0008% typical

• Compressor Noise Specifications ZSOURCE= 40 Ω Balanced

  • Noise @ 0 dB Make-Up Gain (22 Hz – 22 kHz BW) -84.5 dBu typical
  • Noise @ +20 dB Make-Up Gain (22 Hz – 22 kHz BW) -64.5 dBu typical

• Compressor Timing Specifications
  Note: TIMING measurements represent the full range between 1.5:1 and 8:1 ratio and FAST mode

  • FAST Attack 250 μS – 2 mS // Release 100 mS – 200 mS typical
  • MF (MEDIUM FAST) Attack 1 mS – 5 mS // Release 100 mS – 200 mS typical
  • MED (MEDIUM) Attack 3 mS – 18 mS // Release 350 mS – 700 mS typical
  • MS (MEDIUM SLOW) Attack 5 mS – 40 mS // Release 600 mS – 1 S typical
  • SLOW Attack 10 mS – 80 mS // Release 800 mS – 1.5 S typical
  • AUTO Attack 5m S – 40m S // Release T1 400-900 mS, T2 1-2 S typical

• Product Dimensions (W x D x H) 19” (48.3 cm) x 8.25” (20.9 cm) x 1.65” (4.2 cm)

• Shipping Dimensions (L x W x H) 24” (61 cm) x 13” (33 cm) x 4” (10.2 cm)

• Shipping Weight 10 lbs. (4.5 kg)

Shelford Compressor Ratio RMS Level Sweep

PRODUCT WARRANTY

Rupert Neve Designs warrants this product to be free from defects in materials and workmanship for a period of three (3) years from date of purchase, and agrees to remedy any defect identified within such three year period by, at our option, repairing or replacing the product.

LIMITATIONS AND EXCLUSIONS
This warranty, and any other express or implied warranty, does not apply to any product which has been improperly installed, subjected to usage for which the product was not designed, misused or abused, damaged during shipping, damaged by any dry cell battery, or which has been altered or modified in any way. This warranty is extended to the original end user purchaser only. A purchase receipt or other satisfactory proof of date of original purchase is required before any warranty service will be performed. THIS EXPRESS, LIMITED WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, TO THE EXTEND ALLOWED UNDER APPLICABLE STATE LAW. IN NO EVENT SHALL RUPERT NEVE DESIGNS BE LIABLE FOR ANY SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES RESULTING FROM THE USE OF THIS PRODUCT. Some states do not allow the exclusion or limitation of consequential damages or limitations on how long an implied warranty lasts, so this exclusion may not apply to you.

WARRANTY SERVICE
If you suspect a defect in this product, please contact our support staff for troubleshooting by phone (512-847-3013) or email (service@rupertneve.com). If it is determined that the device is malfunctioning, we will issue a Return Material Authorization and provide instructions for shipping the device to our service department.

ABOUT COMPANY

• Rupert Neve Designs
• PO Box 1969
• Wimberley TX 78676
• www.rupertneve.com
• tel: +1 512-847-3013
• fax: +1 512-847-8869

References

• Rupert Neve Designs – The Most Trusted Name in Sound.

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