Test Seas DXT 27TBCD / GB (H1499-06) 25mm dome with waveguide, 6 Ω

Datasheet © www.heissmann-acoustics.de
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m

Seas_h1499_27tbcd_dxt

 

Seas DXT 27TBCD / GB sound pressure & impedance (dispersion)

seas_27tbcd_dxt_Amplitude_

Very broadband and symmetrical superelevation from 800Hz to 10kHz, which can be easily equalized with the crossover. This is due to the waveguide and already a first indication of its effectiveness.

The efficiency reaches broadband 95dB but then drops down to 88dB in super high. In the case of linear tuning, therefore, no more than the named 88dB / 2,83V / m are achieved.

The impedance response is interference-free and shows a slightly asymmetrical "resonance hill" around 900Hz. More often seen in tweeters with coupling volume.

 Seas DXT 27TBCD / GB Sound pressure at angles (15 °, 30 °, 45 °, 60 °)

seas_27tbcd_dxt_winkel

Extremely even directivity into the super high tone. In large parts near the so-called constant directivity Behavior.

Seas DXT 27TBCD / GB Decay behavior

seas_27tbcd_dxt_Ausschwingverhalten

Even and fast decay over all frequencies.

 Seas DXT 27TBCD / GB level linearity 85, 90, 95 and 100dB

seas_27tbcd_dxt_Pegellinearität

Frequency response level corrected, based on the 85dB measurement

Even and low dynamic compression from 100dB / m <= 0,5dB (Please note the scaling => 20dB range)

Seas DXT 27TBCD / GB harmonic distortion

seas_27tbcd_dxt_Klirr

Extremely low harmonic distortion even at 100dB. K2 increases evenly with the level and remains below the 100% mark until 2dB starting at 1kHz.

K3 increasing below 2,5kHz, above that at the measurability limit.


Rating


Frequency response / directional behavior:5 5 out of stars
Range:4.5 5 out of stars
Power handling:4.5 5 out of stars
Consisty:4.5 5 out of stars
Haptics:4.5 5 out of stars
Price-performance:4.8 5 out of stars

Summary


Nowadays the straightening behavior of loudspeakers is getting more and more important. The Seas DXT stands out in this discipline from the competition. No other known tweeter of this size shows as uniform straightening as the Seas DXT.

However, a careful baffle design is required to maintain this behavior. In "normal widths" baffles (~ 20cm) for example. the Seas DXT tends to widen significantly at angles around 3kHz.

Work very well:

  • a practically nonexistent ...
  • or a very wide baffle.

See also here

Also in all other disciplines of the Seas DXT shows without blemish and blame.

 

Test Wavecor TW030WA09 30mm dome tweeter with low sound conduction 4Ω

Datasheet © www.heissmann-acoustics.de
Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m

Wavecor TW030WA09

Wavecor TW030WA09 frequency response & impedance (consisty)

TW030WA09_Amplitude_Impedanz

Very good linearity with evenly decreasing amplitude response. Extremely broadband. The efficiency is on average around 93dB / 2,83V. In the super highs, however, only to 88-90dB.

Both drivers are practically congruent in their frequency response up to 10kHz. Above very small deviations. Very good. The TW030WA09 is expressly advertised as "... best consistency" in the manufacturer data sheet.

There are no disturbances in the impedance. Practically congruent graph of both drivers. Exemplary.

The resonance frequency is at 700Hz. Very low for a driver without coupling volume. The accented resonance peak indicates that there should no ferrofluid be found in the air gap.

 Wavecor TW030WA09 sound pressure at angles (15 °, 30 °, 45 °, 60 °)

TW030WA09_Winkel

Very even and balanced omnidirectional behavior. For a tweeter equipped with a 30mm voice coil even in the super high tones still widely radiating.

Wavecor TW030WA09 decay behavior

TW030WA09_Ausschwingverhalten

Very even and fast decay over all frequencies.

Wavecor TW030WA09 level linearity 85, 90, 95 and 100dB

TW030WA09_Pegellinearität
Frequency response level corrected, based on the 85dB measurement

From 100dB minimum dynamic compression <= 0,5dB in the super high tone.

(Please note the scaling => 20dB range)

Wavecor TW030WA09 harmonic distortion

TW030WA09_Klirr

Very low harmonic distortion even with 100dB. K2 increases evenly with the level, hardly exceeding the 100% mark even with the 1dB measurement.

K3 and higher-order distortions play virtually no role. One might be tempted to separate the tweeter with a steep edge at 1200Hz. Who wants to be safe takes 1,5kHz.


Rating


Frequency response / directional behavior:4.5 5 out of stars
Range:4.8 5 out of stars
Power handling:4.5 5 out of stars
Consisty:4.5 5 out of stars
Haptics:4.8 5 out of stars
Price-performance:4.5 5 out of stars

Summary


The Wavecor TW030WA09 ...

with its 30mm voice coil, a resonant frequency around 700Hz and the very low harmonic distortion already from 1kHz invites you to be married to a beautiful 20 midrange driver. Messtechnisch he makes no weaknesses, is very deep, looks classy, ​​and is, with an EIA of only 55€ (As of Dec. 2013) to be described as extremely cheap.