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Silver 40mm sphere acoustic pressure equalizer for DPA 4000 series microphones

DPA Microphones

DPA Microphones APE40RS 40mm Acoustic Pressure Equalizer for 4000 series

SKU CH-24CN-ZS7N8

A 40 mm acoustic pressure equalizer that adds on-axis boost and off-axis attenuation for DPA 4000 series microphones

  • Designed for seamless integration with 4000 series microphones
  • 40mm sphere enhances directivity with on-axis boost
  • Off-axis attenuation stronger than 30mm version
  • 8 dB front-to-back ratio at 4 kHz reduces reverberation
  • Angle adjustment modifies spectral character of recordings

Acoustic Pressure Equalizer for 4000 series

The APE40RS is a 40mm sphere-shaped accessory built for DPA 4000 series microphones. It acts as a passive acoustic processor that modifies the sound field near the diaphragm. This tool is intended for recording engineers who need adjustable directivity and spectral control in professional environments.

Replaces former L40B with backward compatibility

The equalizer supersedes the previous L40B model while maintaining fit with 4003, 4006, and 4006-TL microphones. It delivers a noticeable on-axis boost between 2 and 8 kHz and stronger off-axis attenuation than the 30mm version. The upgrade is worthwhile when a front-to-back sensitivity ratio of 8 dB at 4 kHz is required to reduce reverberation.

Mounts directly on compatible omnidirectional

The sphere attaches to supported DPA pressure microphones without additional hardware or power. It frees the user to shape tonal balance by rotating the microphone rather than applying electronic equalisation. Builds that rely on active processing or directional capsules cannot use this accessory.

How it compares

Measured against everything we stock in Streaming & USB Microphones, at today’s prices. Recalculated every night.

Price $69.99
Pricier than about 66% of the 1,309 comparable items (median $47.99).

Specifications

No published specifications for this item yet.

Questions about this item

How does the 40mm sphere attach to a 4000 series microphone?

The APE40RS mounts directly onto the microphone capsule of compatible 4000 series models, replacing the former L40B accessory with a secure friction fit.

What is the correct orientation when fitting the equalizer onto the capsule?

Align the sphere so its centre sits over the diaphragm; the accessory is symmetrical, but rotating it off-axis changes the spectral response, so set the angle before locking it in place.

Does the 40mm ball need cleaning or periodic replacement?

The passive acoustic processor has no moving parts or consumable elements; wipe the surface with a dry, lint-free cloth if dust accumulates, otherwise no scheduled maintenance is required.

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