ScanSpeak R3004/602010


The R3004/602010 is a 4Ω tweeter from the ScanSpeak Illuminator series.

In a compact design, using a powerful neodymium motor with an under-hung voice coil configuration together with a large linear excursion capability the R3004/602010 share similar qualities with its larger Illuminator tweeter siblings.

The “R” version (R3004/602010) is essentially the same tweeter as the “D” version (D3004/602010) tweeter, but uses a ring dome diaphragm with an aluminium phase plug for increased frequency linearity.

Key features:

  • 1″ Ring Dome Diaphragm
  • Patented Symmetrical Drive (SD-2) motor
  • Large Non Resonant Alu Rear Chamber
  • Patented Phase Plug Design
  • Sound Transparant Protective Grill
  • Die Cast Housing & Face Plate


ScanSpeak Spec sheet: R3004/602010

T/S Parameters:


Very good consistency between the two tweeter samples and they match very close to the manufacturer’s specification.









(click on picture to zoom)



(click on picture to zoom)

Sample 1 = Green
Sample 2 = Blue

A perfect match between the two tweeter samples.



Frequency measurement conditions:

The tweeter is measured mounted on a baffle with the following conditions:

Baffle size (WxH): 24×51cm with 12mm round-over.
Driver position: Mounted on center-line with driver unit center 7cm from the top of the baffle.
Mic position: 1m distance, on tweeter-axis.
Smoothing: 1/24 octave smoothing applied.

(click on picture to zoom)

Left: Frequency response on-axis (Blue=sample1, Red=sample2).
Right: Frequency response 15deg off-axis (Blue=sample1, Red=sample2).

The two tweeter samples measures virtually the same, which indicates good consistency in the manufacturing process.

Very smooth and linear frequency response. +/- 1dB between 2-20kHz.


0deg = Blue
15deg = Red
22.5deg = Green


30deg = Blue
45deg = Red
60deg = Green



Measurement setup:

  • Tweeter near-field measurement at 10cm
  • Frequency Range Tweeter: 500-10000Hz
  • Baffle size WxH: 24×51cm

The distortion measurements are done in near-field and the amplifier output level was adjusted for each driver so that the fundamental is 85dB, 90dB and 95dB at 1m. This setting simulates normal to medium-high and high listening levels.

85dB @ 1m (click on picture to zoom)

Left = Sample 1

Right = Sample 2


90dB @ 1m (click on picture to zoom)

Left = Sample 1

Right = Sample 2


95dB @ 1m (click on picture to zoom)

Left = Sample 1

Right = Sample 2

Low odd-order distortion even at higher levels and elevated second-order distortion, which rapidly raises below 2.5kHz.

This tweeter should be able to work nicely crossed-over at 2-2.5kHz or higher.