Wednesday, 11 October 2017

TX8652 test by Carmus (RU) : "They can easily compete with home speakers up to 2000€"

The MTX TX8652 speakers have been tested by Carmus, the most pasionnate caraudio website ever seen... Carmus doesn't just give a mark ; they talk about each detail, each feeling with precision. They really spend time - hours and hours - testing and writing their impressions... And it is a delight to read them.

Here is an example : "To be honest, I've been surprised, I did not expect these speakers to be so comfortable and well balanced. As a result, instead of the usual 20-30 minutes listening test, I stuck for several hours, and even then I kept the speakers for several days, listening to familiar compositions and even albums entirely."

Here are some other selected sentences from the article :

  • "It's all accurate and accurate, without any characteristically accents, which would immediately "cling" to the ear. The sound is warm, but never "soft" and not "washed". Tweeters are perfectly coordinated with midbass speakers, what I see as a merit of a crossover - no "scattering" of sound on the bands is not observed.
  • "In my opinion, the sound of the drum is extremely impressive, and this is valid from rock to jazz. Cymbals are perceived as cymbals"
  • "Midbass showed a fairly rare combination of bass depth and definition."
  • "When you first turn on the TX8652, even before the warm-up, the sound stage has already been visibly drawn into the depth."
  • "With the warm-up, the space widened noticeably"
  • "Formally, according to the graphs and figures, the MTX TX8652 is just normal normal acoustics, nothing special. But with the ears, its sound is perceived unexpectedly pleasantly and comfortably. Just what is usually called musicality - you can listen for a long time and with pleasure."

You can click here to display the complete article.

 

Complete translation :

"I noticed this speaker at the spring conference of the company "Bonanza". It was represented by Frederic Houis himself, the inspirer and developer of the MTX brand. He talked to me about it for a long time and he was very enthusiastic, it was evident that it was his favorite model. According to him, several dealers (France, Switzerland) did not hesitate to compare their sound in the midrange / high frequency range with Tannoy high end speakers.

Despite the fact that these speakers are the top of the MTX line, the MTX TX8652 price does not look sky-high (at least, in comparison with top models of other brands). At the time of the test, the recommended retail is 18,900 rubles. Running forward, for her merits, this is really very, very modest.


DESIGN

Designed and assembled acoustics soundly. Sturdy cast basket, crossovers in molded housings. Elements are mostly original. In the hands to hold nice.

LF / MF dynamics are built on motors with 1.5-inch (more precisely, 38 mm) voice coils. The phase-aligning "bullets" are machined from aluminum.

Diffusers have a woven structure, the material is fiberglass. The top suspension is soft, the main stiffness of the speaker is set by the centering washer. Everything is as it should be.

On the back side of the diffuser there is a coating on the outer perimeter, which, apparently, performs a damping function - extinguishes the mechanical stresses that "walk" when the speaker moves from the center to the edges of the diffuser.

The spokes of the basket "clasp" the magnet, it turns out to be completely closed, so that you can only judge its size indirectly. However, the dimensions here are not the main thing, the main thing is the internal geometry, and how successful it is will show the measurements and, of course, the audition.

The centering washer is large enough. The lead-in conductors are realized by flexible insulated leashes according to the classical principle - from the terminal terminal directly to the coil itself.

Included are protective grills. Although, in my opinion, for acoustics oriented to SQ systems they look somewhat pop. But the design is too subjective, so I will not quibble.

Tweeters use domes 28 mm in diameter from a black semi-transparent silk.

As a set, as always, there are cups for different types of installation.

Crossovers are realized in unusual round metal cases. Instead of the usual terminals - the "tails" of wires.

You can select the level of the tweeter - it can be connected to the "0 dB" or "-4 dB" pairs of pins.

By the way, I'll especially note how the tweeter is adjusted. Unlike most crossovers, where the resistors are simply connected in series to the high-frequency circuit, here are the correct L-attenuators that do not "twist" the impedance curve. And for sounding they are usually preferable.


MEASURES

The manufacturer does not give exact parameters for the dynamics, so we will start from the results of measurements.
Impedance of LF / MF speaker (red curve) and tweeter (blue curve)

Measured parameters of LF / MF dynamics:
Fs (natural resonance frequency) - 62 Hz
Vas (equivalent volume) - 9.0 liters
Qms (mechanical quality factor) - 6.93
Qes (electrical quality factor) - 0.77
Qts (full Q-factor) - 0,69
Mms (effective mass of the mobile system) - 16 g
BL (coefficient of electromechanical communication) - 5,3 Tl m
Re (resistance of a voice coil to a direct current) - 3.1 Ohm
dBspl (reference sensitivity, 1m, 1W) - 87dB


And here are the impedance curves of all acoustics assembled with a crossover. Note that when the tweeter is connected to the "0 dB" and "-4 dB" terminals, the graphics are almost identical. Here you clearly see the work of the L-attenuator - it performs its work without changing the overall impedance of the system.

Impedance of the speaker assembly when connecting the tweeter to the "0 dB" terminals (purple curve) and to the "-4 dB" terminals (orange curve)

I turn to the measurement of frequency response. For starters - LF / MF speaker as is, without a crossover. The frequency response looks quite decent, up to 1.5 kHz the directionality does not show, there are no sharp emissions. In per-channel systems, you can safely cut with filters with low steepness, starting from 6 dB / octave already.

The frequency response of a midbasic speaker when switched on in the full band. Red - on the axis. Blue - at an angle of 30 degrees. Green - at an angle of 60 degrees

Tweeters are classical representatives of the "silk" school. Everything is smooth, without sharp perturbations of the frequency response, with a characteristic recession on top.

The frequency response of the tweeter is included in the full band. Red - on the axis. Blue - at an angle of 30 degrees. Green - at an angle of 60 degrees

The crossover quite strongly overcomes the sensitivity of the tweeter to align it with the sensitivity of the midbas speaker. For measurement, I had to adjust the signal level, so that the curves of the frequency response appeared on the chart at approximately the same level.

Tweeter response at crossover switching to 0 dB terminals. Red - on the axis. Blue - at an angle of 30 degrees. Green - at an angle of 60 degrees

When connected to the "-4 dB" terminals, the signal level is honestly reduced by the promised value (tutu, of course, the level did not correct):

Tweeter response at crossover switching to terminals -4 dB. Red - on the axis. Blue - at an angle of 30 degrees. Green - at an angle of 60 degrees

From the frequency response it is clear - you need to orient the tweeters only in the direction of listeners. Razvoroty they are contraindicated.

SURVEY


At the spring conference Bonanza MTX TX8652 was demonstrated in the listening room. But it was almost impossible to evaluate it at that time - there the source and the amplifier were simpler, and the case for the midbass was a bit tight. In my opinion, it was not possible to reveal its potential. To avoid unnecessary questions, I result in the composition of the system in which the audition was conducted this time.

Source - DAC on top Asahi Kasei AK4490 + MUSES 8820
Volume control - buffer preamplifier for 6n28b
Interconnecting cables - The Chord Indigo Plus
Amplifier - E.O.S. Classic 100 (modernized by VL Reznikov)
Acoustic cables - E.O.S. TA-14 (two wires of four are involved)
Acoustics for comparison - PSB Synchrony One B


The speakers, installed in their usual test boxes (approximately 30 liters, internal walls with diffusers, partial filling with an absorber). Boxes as usual to almost each other, imitating the car installation. Tweeters connected to the terminals "0 dB", and then left the same position, it seemed to me more preferable.


General impressions

To be honest, I've been surprised, I did not expect these speakers to be so comfortable and well balanced... As a result, instead of the usual 20-30 minutes listening test, I stuck for several hours, and even then I kept the speakers for several days, listening to familiar compositions and even albums entirely.


It's all accurate and accurate, without any characteristical accents, which would immediately "cling" to the ear. The sound is warm, but never "soft" and not "washed". Tweeters are perfectly coordinated with midbass speakers, what I see as a merit of a crossover - no "scattering" of sound on the bands is not observed.

HF

Tweeters up to the very top are really a bit short, but this does not surprisingly cause any discomfort. In the informative part of the HF range, the sound is perceived openly and in detail - the classical "silk" sound feed. Sizzly-hissing sounds are natural in their structure, they do not stand out and do not fall out of the general sound picture.

In my opinion, very impressive is the sound of the drum sets - even in rock, though in jazz. Copper was perceived copper, the plates themselves where you need light, and where you need - voluminous and weighty. No "rustling sachets," voiced, "glassy" and other "staining." Although, to some extent, here again the merit of the crossover, matching tweeters with LF / MF speakers.

LF

Midbass showed a fairly rare combination of bass depth and definition. But in the full lane I would not be letting the dynamics go, so the bass loses a bit and articulation a little. Although, what really there, you can cut them all the same low enough - up to 60 Hz you can safely let go.

What I liked in the bass drum is not only a slap on the membrane, but the bass itself. When acoustics can reproduce this sound independently, without shifting the responsibility to the subwoofer, the sound is perceived much more interesting. Subwoofer in this case remains only his direct duty - to "support" the sound at the very bottom.


Sound scene, volume transfer

I think this is one of the most critical moments that show the potential of a speaker. The slightest loss of small details and after-sounds (which are present in the signal, but not perceived by our hearing clearly) immediately leads to the fact that the sound picture becomes flat and boring. By the way, this is one of the reasons why MP3 on good equipment "does not sound." Rather, this format is suitable only for pop.

When you first turn on the TX8652, even before the warm-up, the sound stage is already visibly drawn into the depth, although at first it is not too confident. With the warm-up, the space widened noticeably and became more natural. It's a very interesting feeling, as if another "virtual" space has opened behind the speakers. This is especially audible on "live" recordings made in natural conditions (say, Naim True Stereo). And if the acoustics of these tracks are transmitted so confidently, then with the rest and all the more everything is in order.


CONCLUSION

Formally, according to the graphs and figures, the MTX TX8652 is just normal normal acoustics, nothing special. But with the ears, its sound is perceived unexpectedly pleasantly and comfortably. Just what is usually called musicality - you can listen for a long time and with pleasure.

The musical material is delivered with good microdynamics and detail, light after-sound, drawing the volume of the sound stage, are not lost. The main thing is to allow the acoustics to warm up for at least a couple of dozen hours, with heating the sound changes quite strongly.

I liked the good alignment of tweeters with midbass speakers, the crossover here is calculated as it should be. It's even a pity that in the processor system it will remain out of work. In this sense, it would be nice if the cross was with the possibility of bi-amping.

On installation in the car no surprises - it is good to prepare the door to realize the bass potential of LF / MF speakers, and tweeters to direct mainly towards the listeners.

And also with the MTX TX8652 you can do good home speakers, which, in my opinion, will easily compete with most home speakers in the range of up to 100,000 rubles. You can have it in mind.

(+)
Smooth balanced sound on MF / HF
Confident operation at low frequencies
High-quality construction, high-quality execution
Can be used for high-quality home speakers

(-)
The higher the speakers potential, the more difficult it is to realize it in a car
The possibility of bi-driving in a crossover would be very useful here

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