Heissmann Acoustics

Test Scan-Speak Discovery D2604 / 833000 26mm dome tweeter 4 Ω

Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m.

Scan-Speak Discovery D2604 / 833000

Frequency response and impedance (consisty)

Extremely broadband frequency response. Full level from 1,1kHz, with good linearity.

The average efficiency is exceptionally at 93dB / 2,83V.

Impedance is flawless. The resonant frequency with 430 respectively 440Hz is below the manufacturer's specification of 475Hz.

Both drivers behave almost congruently both in amplitude and impedance.

Directivity horizontal (0°, 15°, 30°, 45°, 60°)

Directivity of the Scan-Speak D2604 / 833000 is even and balanced throughout the entire transmission range.

In the top octaves> 10kHz significantly wider radiating than, due to the effective membrane area of 8cm², would be expected.

Burst decay

Overall smooth and fast decay over all frequencies.

> 10kHz minimal delay.

harmonic distortions

The Scan-Speak D2604 / 833000 has outstanding low harmonic distortions.

K3 remains below 1% at all measured levels> 0,5kHz largely independent of the excitation signal.

K2 increases with the level, extends very evenly and would not reach the 1% to 1dB / m even with a crossover-point at 100kHz!

Rating

Frequency response / directional behavior:
Range:
Power handling:
consisty / without rating:
Haptics:
Price-performance:

Conclusion

With an effective membrane area of 8cm², a resonant frequency <xnumxhz and="" the="" very="" low="" harmonic="" distortions,="" driver="" invites="" to="" be="" deeply="" crossed="" eg.="" a="" xnumxer="" mid-woofer.="" crossover="" frequencies=""> = 500kHz should be possible without any problems. In smaller systems, eg with a 20er TMT, the Scan-Speak D1,5 / 13 could be crossed even at lower frequencies.</xnumxhz>

The concept of a large effective membrane area, in combination with a "standard voice coil" (26mm), and a rather soft dome material works out. Widely radiating in te top octaves, crossable very low, with high load capacity.

=> Scan-Speak D2604 / 833000 with waveguide

Test Peerless XT19TD00-04 (Vifa XT-200 K4) Ring radiator, 4 Ω

Datasheet © www.heissmann-acoustics.de

Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m

19mm ring radiator from Peerless, distributed by Quint-Audio. Equipped with a 4mm front plate, a 4-hole attachment, a "bead only design" as a membrane, a coupling volume and excellent measured values ...

Vifa / Peerless XT19TD00-04 (XT-200 K4) sound pressure & impedance (dispersion)

Outstanding linear frequency response. From 2,5-14kHz + -0,5dB!

Full level from 1,2kHz. Extremely good-natured "roll-off". With an average of 89,5dB / 2,83V, the efficiency is rather below average. For most applications, however, completely sufficient.

Outstanding pair equality in the two measured copies both in impedance, - and amplitude response. The maximum deviation of both drivers> 500 Hertz is + -0,15dB! This testifies to an excellent production consistency.

Thanks coupling volume very low resonance frequency around 750Hz. The impedance peaks indicate a dose of low-viscosity ferrofluid. Their slightly different characteristics are completely meaningless, being far out of the usable range.

Vifa / Peerless XT19TD00-04 (XT-200 K4) Sound pressure at angles (15 °, 30 °, 45 °, 60 °)

Extremely consistent and a 19mm voice coil corresponding Rundstrahlverhalten.Idealer game partner for broad-beam concepts. Also interesting would be the ring emitter a very small baffle (similar Samira) to provide a uniform directivity to the TMT / MT.

Vifa / Peerless XT19TD00-04 (XT-200 K4) Decay behavior

Very smooth and fast decay over all frequencies.

Vifa / Peerless XT19TD00-04 (XT-200 K4) harmonic distortion

Vifa Peerless_XT19_XT200_Circle — gray line: 1% distortion
Graph switches every 3 seconds

Outstanding low distortion 3.order. From 2kHz at all measured levels <0,1%. The "good-natured" K2 increases relatively sharply below 3kHz. A little bit of "enhancement" is built in. Higher order distortion components are practically not apparent. For very level-stable combinations, I recommend separations from 3kHz. Smaller 2-way (e.g. with a 4 ″ TMT) can be separated by 2kHz.

Rating

Frequency response / directional behavior:
Range:
Power handling:
Consisty:
Haptics:
Price-performance:

Conclusion

The 19mm ring emitter Vifa / Peerless XT19TD00-04 (XT-200 K4) measured in the sum of its properties absolutely outstanding!

The relationship to his big brother, the XT25TG30-04 shows not only on the outside but also in all measurements. (The resourceful reader will have noticed that a few passages in the text are identical in both tests ...)

The frequency response is linearly smooth. Can be used in very level-stable combinations from 3kHz, otherwise lower. Series spread seems a foreign word for the driver. Furthermore, its intended working range is far outside the region around the resonance frequency that is prone to series fluctuations due to the design of tweeters. It is generally not recommended to separate tweeters> = 2x FR for nothing. Extremely commendable.

and the whole thing for extremely inexpensive 45 € (RRP) ...

Test Peerless DX25TG09-04 (Vifa XD-270 F / 4) at Waveguide WG-300 4 Ω dome tweeter with waveguide

Datasheet © www.heissmann-acoustics.de

Measurements in 20x40cm baffle, 10mm rounded, in 70cm distance at 2,83V. Level scaled to 1m.

The Waveguide was milled with a CNC adapter plate mounted on the tweeter.

Vifa XD270F4 WG300 closeup

Directivity horizontal (0-90 ° in 15 ° steps)

Due to the waveguide system-related symmetrical elevation in the frequency band of 1-10kHz. This can be easily leveled with the crossover.

The Vifa Peerless XD-270 / F4 goes perfectly with the waveguide WG-300. Very even bundling without significant disturbances. The behavior> 10kHz can be described as outstanding. 20kHz are reached even below 45 ° with an almost full level.

The amplitude response drops below 45 ° of 2-18kHz by only 2,5dB! The 30 ° curve runs to 20kHz in a + -1,5dB tight tube. 20kHz are reached at full level.

The sonogram shows a bundling behavior that comes very close to the so-called Constant Directivity.

Sound pressure standardized at angles to 0 °

Burst decay

Minimal delayed decay by 2 and 20kHz. Otherwise perfectly.

Harmonic distortions

The harmonic distortion of the XD-270 F / 4 on the waveguide is excellent.

K2 remains below the 100% mark even at 1,2dB as of 1kHz. K3 moves from 1kHz between 0,04 and 0,3%.

Clatter components of higher order are in the (for me) no longer measurable range.

Separations from 1,2kHz are possible without hesitation, depending on the application and level requirements possibly even deeper.

Rating

Frequency response / directional behavior:
Range:
Power handling:
consisty:
Haptics:
Price-performance:

Conclusion

The Peerless / Tymphany DX25TG09-04 on the Waveguide WG-300 measures itself outstanding.

The possibility of building a loudspeaker that comes close to the requirements of constant directivity. Separations from 1,2kHz. Lowest harmonic distortion even at 100dB / m ...

Of course, a very interesting driver for Cinetor.

Test Peerless / Tymphany XT25TG-30 / 04 (XT-300 / K4) at the waveguide WG-300 / PCT-300 4 Ω ring emitter with waveguide

Datasheet © www.heissmann-acoustics.de

Measurements in 20x40cm baffle, 10mm rounded, in 70cm distance at 2,83V. Level scaled to 1m.

The Waveguide was milled with a CNC adapter plate mounted on the tweeter.

XT25TG-30 / 04 Sound pressure at angles

System-related exaggeration in the frequency band of 1-7 kHz. Due to its symmetry, this can be easily equalized with the crossover. It is the purpose of a sound guide to act as an acoustic amplifier. The Vifa XT-300 (XT25TG-30/04) is an excellent match for the waveguide. Extremely even bundling without any disturbances worth mentioning. Due to the large dome (30mm voice coil), a slightly stronger directivity from 8kHz. Recommendation: plan a slight increase> 8kHz in the high frequency on axis.

XT25TG-30 / 04 Sound pressure standardized at angles to 0 °

Here, the frequency response was linearized on axis. The 2. Picture (sonogram) clearly shows the excellent uniform straightening behavior of the combination of XT-300 and the waveguide.

XT25TG-30 / 04 decay behavior

Minimal delayed decay by 2kHz. Otherwise perfectly.

XT25TG-30 / 04 harmonic distortions

As expected, the distortion decreases compared to the variant without waveguide. The XT-300 already showed very good distortion even without waveguide, but with a significant increase of K2 under 3kHz. With Waveguide the effect is also present but attenuated by about 5dB. In sum, very low distortion. Even with 100dB, everything from 2kHz remains below 1%. K3 moves at the measurable limit.

Rating

Frequency response / directional behavior:
Range:
Power handling:
Constance / Without Rating /:
Haptics:
Price-performance:

Conclusion

The Peerless XT25TG-30/04 and the Waveguide WG-300 are a very attractive combination for extremely level-stable installations, for example in the home theater. Can be used from 1,5 kHz. I think I'll test it out in Cinetor.

Test Peerless / Tymphany XT25TG-30 / 04 (Vifa XT-300 / K4)

Datasheet © www.heissmann-acoustics.de

Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m

An extraordinary tweeter, equipped with a 5mm thick front panel, a 5-hole attachment and a "bead only design" as a membrane.

Vifa / Peerless XT-300 K4 (XT25TG-30/04) sound pressure & impedance (dispersion)

Outstanding linear frequency response. Full level from 1,3kHz. Extremely good-natured "roll-off". The efficiency is on average 91,5dB / 2,83V. One copy has a resonance frequency that is 20% higher, but this has no effect in the intended working range. Otherwise congruent course from 1,5 kHz. Very well. At the frequency response you have to look very closely to see whether there are 2 or 3 drivers. Practically congruent course from 600Hz.

Vlt. a little note at this point:

I do not buy any preselected drivers ... With such a result, one might suspect that.

Vifa/Peerless XT-300 K4 (XT25TG-30/04) sound pressure at angles (15°, 30°, 45°, 60°)

Very uniform omnidirectional behavior. Somewhat stronger directivity than with 25mm calottes. No criticisms. Recommendation: Tuning linearly to 15 °.

Vifa / Peerless XT-300 K4 (XT25TG-30 / 04)

Extremely smooth and fast swinging over all frequencies.

Vifa / Peerless XT-300 K4 (XT25TG-30 / 04) harmonic distortion

Vifa Peerless XT-300 (XT25TG-30 / 04) Harmonic — Gray line: 1%
Graph switches every 3 seconds

Outstandingly low 3rd order distortion. From 1,5kHz <0,1% at all measured levels. The "good-natured" K2 rises relatively sharply below 3kHz. A little bit of "whitening" is built in. In the case of separations> = 2kHz, K2 should still remain below the perceptibility threshold, even at very high levels.

Rating

Frequency response / directional behavior:
Range:
Power handling:
Consisty:
Haptics:
Price-performance:

Conclusion

The ring emitter Vifa / Peerless XT-300 K4 (XT25TG-30 / 04) is outstanding in the sum of its properties!

The frequency response is linearly smooth, the omnidirectional response is extremely even and the decay behavior could not be better.

The ring emitter can be used in very level-stable combinations from 2kHz. With "normal" level requirements also lower.

Series spread seems a foreign word for the driver. Furthermore, its intended working range is far outside the region around the resonance frequency that is prone to series fluctuations due to the design of tweeters. It is generally not recommended to separate tweeters> = 2x FR for nothing.

and the whole thing for extremely inexpensive 47 € (RRP) ...

I have installed the XT-300 K / 4 with the SPH-175HQ in the kit Samuel HQ, and I am very pleased with its features.

Go to the Samuel HQ kit

Test Peerless DX25TG09-04 (Vifa XD-270 F / 4) Dome tweeter 4 Ω

Datasheet © www.heissmann-acoustics.de

Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m

Test Vifa / Peerless XD-270 F / 4 (DX25BG60-04)

Frequency response and impedance (consisty)

Very broadband. Full level from 1,1kHz. Apart from a slight dip around 8,5kHz very linear. This shows neither in the decay behavior, nor in the distortion diagram and is therefore classified as harmless. Assign you is probably the conspicuously thick bead. This is supported by the disappearance of burglary under angles.

The average efficiency is 93dB / 2,83V. Compared to 8 Ohm drivers, 3dB must be subtracted.

Both drivers behave almost congruently up to 10kHz, above that they fluctuate a maximum of + - 0,5dB, which is absolutely harmless.

The impedance paths are congruent in the area of effect.

Addendum: New measurement, now with 4 drivers.

Series dispersion seems to be hardly an issue for the XD-270 F / 4. Still practically congruent course, only in the top octave with minimal deviations (Max. + -0,5dB).

Sound pressure at angles (15 °, 30 °, 45 °, 60 °)

Good to see that the mentioned sink from 30 ° no longer comes to bear. The straightening behavior of the DX25TG09-04 is very good. Under 30 ° the 20kHz is easily reached, which is unusual for a dome of this size.

Burst decay

Overall, very smooth and rapid decaying over all frequencies.

harmonic distortions

Vifa / Peerless XD-270 F / 4 (DX25BG60-04) harmonic distortion — Gray line corresponds to 1%. Picture change every 3 seconds.

Overall, the DX25TG09-04 has outstanding low harmonic distortion. K3 remains below 900% at all measured levels as of 0,3 heart and runs largely independent of the excitation signal.

K2 increases with the level, runs very evenly and could be quite a steep separation to 1,5 Khz (possibly even lower) to. The 1% mark would not be exceeded even with 95dB / 1m.

Rating

Frequency response / directional behavior:
Range:
Power handling:
Consisty:
Haptics:
Price-performance:

Conclusion

The Peerless DX25TG09-04 is in many ways an unusual tweeter. A 5mm strong front panel (identical to the XT-300), a surround that could more easily be attributed to a midrange driver, an 5 hole mount and the very low resonant frequency despite the absence of the back chamber.

The distortion values are exceptionally good and, in combination with the low resonance frequency, allow a separation of around 1,5 kHz.

Only the collapse of 8,5kHz spoils the otherwise impeccable impression a bit. Through clever wiring, however, a + -1dB linear frequency response can still be achieved.

This tweeter gets a thick recommendation

Furthermore, he seems to me in the sum of its properties to be a very interesting candidate for a waveguide. In addition more timely.

Addendum: The assumption has been confirmed: Test Peerless DX25TG09-04 with waveguide

Test Vifa Peerless XT-25 / Neo4 (XT25SC90-04)

Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m

Vifa / Peerless XT-25 / Neo4 (XT25SC90-04), a very level-resistant, small neodymium ring emitter, can be used wherever it gets tight ...

Vifa / Peerless XT-25 / Neo4 (XT25SC90-04) amplitude response dispersion

Good linearity. Full level already from 0,9kHz!

With 91,5dB / 2,83V, the efficiency is average for an 4Ohm driver and sufficient for 95% of all applications.

At 4khz there is an interference point that also shows up in the impedance response, but not in the decay behavior. With clever wiring of the Peerless XT-25 / Neo4, you can "conjure up" a 2dB dip around 3,5kHz from the cant, which is usually perceived as very pleasant. D.

The amplitude responses of the two drivers are practically congruent. Very good

Vifa / Peerless XT-25 / Neo4 (XT25SC90-04) Impedance (Scatter)

The 830Hz resonant tip of the ring radiator shows that no ferrofluid was used. A minimal disturbance can be seen in 4kHz, which also shows in the amplitude response. The impedance paths of the measured drivers are congruent. Exemplary.

Vifa / Peerless XT-25 / Neo4 (XT25SC90-04) Sound pressure at angles (0-90 °)

Due to its large diaphragm (30mm diameter) the ring radiator straightens more than 25mm calottes, but very evenly. Many Tüfftler appreciate this property when coupling the Peerless XT-25 / Neo4 to a waveguide.

Vifa / Peerless XT-25 / Neo4 (XT25SC90-04) decay behavior

Overall, very smooth and rapid decaying over all frequencies. No criticisms.

Vifa / Peerless XT-25 / Neo4 (XT25SC90-04) harmonic distortion

K3 is extremely low up to 2kHz, below which it rises steeply. K2 rises evenly below 3kHz. However, in my opinion nothing stands in the way of a separation of around 2kHz. In combination with two 5 ″ drivers, I already disconnected at 1,7kHz and the dome copes with that without any problems. Even there, K2 hardly scratches the 1% mark. Overall really good values.

Rating

Frequency response / directional behavior:
Range:
Power handling:
Consisty:
Haptics:
Price-performance:

Conclusion

Level fixed small tweeter which is very universally applicable.

Due to the large membrane, it can be very loud and can be used from 2kHz.

Due to its "special" directional effect, the ring emitter is very well suited to be combined with a waveguide (eg WG-300 from Monacor). Then the distortion drops below 2kHz and nothing stands in the way of a separation of 1,5kHz.

Predestined is the Peerless XT-25 / Neo4 for d'appolito, - and all other arrangements in confined spaces.

To emphasize is the very small dispersion. The two measured specimens of the ring radiator are practically congruent both in amplitude and impedance.