RST28A-4 1-1/8" Reference Series Aluminum Dome Tweeter 4 Ohm

Quick Overview

The Dayton Audio RST28A-4 1-1/8" aluminum dome Reference Series tweeter has remarkable clarity, low free air resonance, exceptional efficiency, and smooth frequency response, a combination seldom found in the industry at any price. This upgrade over the original RS28A-4 provides incredible performance at an amazing value.

Product Highlights

  • 1-1/8" aluminum diaphragm offers remarkable clarity without the typical harshness of metal domes
  • Exceptional efficiency at 92.5 ±3dB from 1.5 kHz to 19 kHz and a smooth frequency response
  • Well-designed phase bridge to balance the response in the upper octave
  • Tuned rear chamber and high-quality Ferrofluid for excellent low-end response
  • Low-distortion motor system achieves a rare level of transparency
  • Matches the performance of even the most expensive audiophile high-frequency transducers

Product Manuals / Spec Sheets / Downloads

Dayton Audio RST28A-4 Specification Sheet
Dayton Audio RST28A-4 Data Files

The Dayton Audio RST28A-4 aluminum dome Reference Series tweeter offers exceptional efficiency from 1,500 Hz to 20,000 Hz with smooth and well controlled frequency response. This tweeters unique black anodized 1-1/8" aluminum diaphragm and state-of-the-art motor system not only match the look and features of Dayton Audios Reference Series woofers and midranges, but also the clean, detailed, and uncolored sound you have come to expect. A specialized damped rear chamber, well-designed phase bridge, rigid mesh grill, and several distortion-reducing paths in the motor are just a few of the features that allow these tweeters to outperform some the most expensive audiophile high-frequency transducers.

Speaker Series Reference Series
Model Number RST28A-4
List Price $49.99
Color Black
Unit of Measure Each
UPC 848791004896
Warranty - Parts 5 Years
Warranty - Labor 5 Years
Product Shipping Weight (lbs.) 1.8
Speaker Type Tweeter
Nominal Diameter 1.125"
Power Handling (RMS) 80 watts
Power Handling (max) --
Continuous Program Power --
Impedance 4 ohms
Sensitivity 92.5 dB @ 2.83V/1m
Frequency Response


500 - 20

Voice Coil Diameter --
Magnet Weight --
DC Resistance (Re) 3.0 ohms
Voice Coil Inductance (Le) 0.03 mH
Resonant Frequency (Fs) 775 Hz
Mechanical Q (Qms) 2.15
Electromagnetic Q (Qes) 1.65
Total Q (Qts) 0.93
Diaphragm Mass Inc. Airload (Mms) --
Moving Mass Of Diaphragm (Mmd) --
Mechanical Compliance of Suspension (Cms) --
Surface Area Of Cone (Sd) 6.6 cm²
Volume of Displacement (Vd) --
BL Product (BL) --
Compliance Equivalent Volume (Vas) --
Maximum Linear Excursion (Xmax) --
Drivers Mechanical Losses (Rms) --
Entry / Exit Diameter --
Surround Material --
Voice Coil Wire Material --
Voice Coil Former --
Basket/Frame Material --
Magnet Material --
Overall Outside Diameter --
Overall Depth --
Baffle Cutout Diameter --
Mounting Hole Diameter --
Bolt Circle Diameter --
Product Weight --