ScanSpeak D2608/913000



The D2608/913000 is a tweeter from the ScanSpeak  Discovery series. It’s essentially the same tweeter as the famous Peerless “HDS” tweeter, but nowadays its built by ScanSpeak . It plays in a division higher tan the other “Discovery” tweeters, almost like the “Revelator” or “Illuminator” tweeter series.

It offers a very sturdy build quality with a metal faceplate and a double magnet system.

It uses ferrofluid combined with  a fully vented motor system for low compression and it has a fairly low resonance frequency. This is a low distortion tweeter an can be used as low as 1500Hz.

ScanSpeak Spec sheet: D2608/913000

T/S Parameters:


About 10% higher fs than official spec sheets. Not a perfect match between the two samples, but within limits.









Free air impedance measurement:

Sample 1 = Green

Sample 2 = Blue

Thanks to ferrofluid in the magnetic gap, a shallow impedance peak around fs. The two sample are a reasonable close match.





Frequency measurement conditions:

The tweeter is measured mounted on a 14 liter Dayton Audio enclosure (PartsExpress part #302-721) baffle with the following conditions:

Baffle size (WxH): 21,59×35,56cm (8,5″x14″)

Driver position: Mounted on center-line with driver unit center 8cm from the top of the baffle.

Mic position: 1m distance, on tweeter-axis.

Smoothing: No smoothing applied.


Not a perfect match between the two samples in the higher octaves. Sample 2 has a broad dip around  15kHz, but instead has a frequency response up to 30kHz!

In the cross-over region they measure essentially the same.


Sample 1

0deg = Blue

15deg = Red

22.5deg = Green

Baffle diffraction around 3.5kHz which as expected flattens out off-axis. Nice extended frequency response and off-axis dispersion.

Sample 1

0deg = Blue

15deg = Red

30deg = Green

Sample 1

0deg = Blue

30deg = Red

45deg = Green

Even at 45deg off-axis this tweeter reaches 15kHz!



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

  • Tweeter near-field measurement at 10cm
  • Frequency Range: 500-10000Hz
  • Baffle size WxH: 21,59×35,56cm (8,5×14″)

Sample1 – 85dB at 1m

Sample2 – 85dB at 1m

Sample1 – 90dB at 1m

Sample2 – 90dB at 1m

Overall very low distortion throughout the frequency range. This tweeter can be crossed-over as low as 1.5kHz, without distortion becomes an issue.