ER3C Sound Delivery Tubes for Small Plastic Eartips (ER3-06, 1 pair/pack)

Sound Delivery Tubes (ER3-06) including coupler for ER3C tubal insert earphones and small 3mm/4mm plastic eartips. The sound delivery tube is 26.5cm in length and has a constant diameter of 1.35 mm ID × 2.16 mm OD. Two ER3C Sound Delivery Tubes per pack (one red and one blue). The color-coding is for easy binaural identification of the left (blue) and right (red) ear.

Sound Delivery Tubes are used to connect small plastic tips to the ER3C tubal insert earphone. The smooth frequency response of ER3C earphones depends on maintaining a total of 292 mm (11.5 inches) of the sound channel between the case wall and the eartip outlet. Of this 292 mm total, 22 mm is provided in the eartip, 5.5 mm is provided by the small metal tip, and 264.5 mm is provided by the sound-delivery tubes.

Technical Specifications

• Compatibility: ER3C tubal insert earphones
• Tube length (without coupler): 26.5mm
• Inner diameter: 1.35mm
• Outer diameter: 2.16mm
• Material: Polyurethane
• Packaging: 2 coupler tubes (red and blue, 1 pair) including coupler for ER3C

Application Note

Caution: Do not cut the sound tube. A change of 10 mm in the length of the sound tube will change the frequency response by 0.5 dB at some frequencies.