VPD variable inline attenuator

VPD variable inline attenuator

VPD variable inline attenuator

$59.00$79.00

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SKU: VPD Category:

Description

The VPD variable inline attenuator can be configured as one of the following:

  • XLR-F to XLR-M, 6dB to 30dB balanced microphone level attenuator, in eight 3-4dB steps.
  • XLR-F to XLR-M, 6dB to 48dB balanced line-level attenuator, in eight 6dB steps.
  • 1/4″ TRS to 1/4″ TRS, 6dB to 48dB balanced mono line-level attenuator, in eight 6dB steps.
  • 1/4″ TS to 1/4″ TS, 6dB to 48dB unbalanced mono line-level attenuator, in eight 6dB steps.
  • 1/4″ TS to 1/4″ TS, 6dB to 48dB unbalanced mono high-impedance attenuator, in eight 6dB steps.
  • 1/4″ TRS to 1/4″ TRS, 12dB to 48dB unbalanced stereo line-level attenuator, in four 12dB steps.
  • XLR-F to XLR-M, passive balanced low cut filter for microphones, 50Hz to 160Hz in four 2/3 octave steps.
  • XLR-F to XLR-M, passive balanced line-level low cut filter, 50Hz to 160Hz in four 2/3 octave steps.
  • 1/4″ TRS to 1/4″ TRS, passive balanced line-level low cut filter, 50Hz to 160Hz in four 2/3 octave steps.
  • 1/4″ TRS to 1/4″ TRS, passive unbalanced stereo line-level low cut filter, 50Hz to 160Hz in four 2/3 octave steps.
  • 1/4″ TS to 1/4″ TS, passive unbalanced mono line-level low cut filter, 20Hz to 500Hz in eight 2/3 octave steps.
  • XLR-F to XLR-M, passive notch filter, -7dB at 250Hz to 6kHz in eight 2/3 octave steps.
  • XLR-F to XLR-M, passive three-band EQ (coming soon)

Custom values for attenuation, input impedance, and frequency corner are available on request.

Microphone level attenuators are intended for use with condenser microphones on loud sources. Microphone level attenuators have an input impedance of approximately 2KΩ and will thus pass phantom power with minimum voltage drop.  Maximum input level is +20dBV.

Line level attenuators have input impedance of 7KΩ or higher and are thus not intended for use between microphone and amplifiers, but rather between line level outputs and inputs.  Maximum input level is +30dBV.  Also available is a high-impedance version with 100KΩ input using 1/4″ TS connectors.

The passive low-cut filters’ frequency corners will vary slightly with the input impedance of the following device.  The microphone filter is designed for loads between 1KΩ and 3KΩ;  the line-level filter is designed for loads of 10KΩ or more.  The stated frequency range will only be accurate for the specified impedance.  The microphone filter is a shelving type in order to pass phantom power to connected microphones.  The maximum cut is -20dB, which will be achieved at no lower than 10Hz.  Insertion loss is less than -3dB.  Phantom power voltage drop is 1.7V per 1mA draw by the connected microphone.

The passive notch filter is designed for feedback rejection in live sound applications.  The 2/3 octave bands are designed to cover the midrange frequencies where feedback typically occurs.  The notch filter has insertion loss of -3dB.  The passive notch filter will pass phantom power with voltage drop of 0.2V per 1mA draw by the connected microphone.

All VPD XLR inline attenuators/filters are directional balanced (“U” pads); the TRS attenuators/filters are symmetrical unbalanced or balanced (“T” or “H” pads).  The VPD attenuators use precision 1% tolerance resistors, so matching between units and channels in stereo units will typically be within 0.1dB.  Due to greater tolerance in reactive components, the frequency corners of the filters may vary up to 5%.

Coming soon: The passive three-band EQ contains three filters; a shelving low-cut filter with three settings (160Hz, 60Hz, and either 20Hz or bypass) and maximum cut of -20dB; a -7dB midrange notch filter with six settings from 250Hz to 4kHz plus bypass; and a high-cut filter with three frequencies (6kHz, 8kHz, 12kHz) and two settings (shelving or lowpass), plus bypass. Insertion loss is -7dB.  The passive three-band EQ’s switches may be set with either a spindle (shown) or a screwdriver slot (3mm flathead).  Phantom power voltage drop is 1.8V per 1mA draw by the connected microphone.

The passive three-band EQ filter may be contain an optional PFA circuit to adapt low-voltage microphones or high-impedance instruments for phantom-powered input.  To select the PFA option, order an unterminated PFA together with the three-band filter.

Additional information

Weight 0.25 lbs
Dimensions 5 × 3 × 1.5 in
Type

XLR microphone attenuator, XLR line-level attenuator, TRS balanced line-level attenuator, TS mono unbalanced line-level attenuator, TS mono unbalanced high-impedance attenuator, TRS stereo unbalanced line-level attenuator, XLR low-cut microphone filter, XLR low-cut line-level filter, TRS balanced low-cut line-level filter, TRS stereo low-cut line-level filter, TS low-cut line-level filter, XLR passive notch filter