https://youtube.com/shorts/A9Nkq44uE-k?feature=share Suspension material impregnated fabric basket material Steel Magnetic system Ferrite Mounting diameter 188 mm Mounting depth 86 mm fs 110 Hz Qts 0.7 Vas 14.8 l "PA" speakers rarely get into my reviews, but this does not mean that they do not exist in the laboratory. It just so happens that not all of them perform well, and therefore remain without test reports. SWAT REV-80Pro of the second generation turned out to be not only successful, but, to be honest, hooked with their capabilities. Firstly, this is a really worthy option for SQL systems (not screaming chants, but correct SQL). And, secondly, they also have the potential for home use. In general, about everything in order and, as always, with the appropriate proofs. FIRST ACQUAINTANCE, DESIGN FEATURES I note right away that the diffusers here are larger than those of conventional 8-inch speakers. If you look at the effective diameter (approximately along the midline of the upper suspension), then for the majority it fluctuates between 16-17 mm, and here it is 17.5 cm. Cone stiffness is often an issue in 8-inch gauges, but it looks decent here. The material is dense, in bending the diffusers are even some kind of elastic or something - cellulose pulp is clearly with hardening additives. Plus, the curvilinear generatrix of the cones adds rigidity. On the reverse side, a fibrous structure can be traced, but the description does not give details on this. Baskets - steel stamped, complex shape. They are muffled well, they do not resonate, everything is in order with rigidity. The motors are quite large - on 128 mm ferrite rings 20 mm high. The weight of each speaker is about 3 kg. Mounting depth - 86 mm. And by the way, pay attention - the diameter of the mounting hole is 188 mm. This is slightly more than standard 8-inch speakers The winding geometry of a 1.5-inch voice coil cannot be determined offhand, but the manufacturer gave the following data: winding height - 10.5 mm, magnetic gap height - 8 mm. That is, the speaker has a 2.5 mm peak-to-peak travel without the coil coming out of the gap. It turns out very well for the stage: about 80% of the voice coil is in the gap, which promises good controllability of the speaker by the amplifier, and at the same time there is some freedom of movement, which promises the ability to get into the mid-bass range. Here it generally turns out to be interesting, I will dwell on this in more detail on the measurements. MEASUREMENT OF PARAMETERS AND ANALYSIS OF WORK Judging by the impedance graph, there is clearly a Faraday ring (short-circuited coil) in the motor: with increasing frequency, the graph almost does not climb up. In fact, the ring compensates for the inductance of the voice coil, the amplifier works with such a speaker at midrange and HF almost like with a conventional resistive load, thereby reducing intermodulation distortion in these ranges. The disadvantage of the Faraday ring is that it “eats” the power of the motor, the electrical quality factor increases, and with it the full one. In general, this is what it looks like in SWAT numbers: Measured parameters SWAT REV-80Pro v.2: Fs (natural resonant frequency) - 101 Hz Vas (equivalent volume) - 14 l Qms (mechanical quality factor) - 6.02 Qes (electric quality factor) - 1.04 Qts (full quality factor) - 0.88 Mms (effective mass of the moving system) - 14.3 g BL (electromechanical coupling coefficient) - 5.2 T m Re (DC resistance) - 3.1 ohm dBspl (reference sensitivity, 1m, 1W) - 93.4 dB The "side" effect of the same Faraday ring is an increase in returns at the upper edge of the midrange and in the high-frequency range, so that the frequency response also goes up with increasing frequency. But it does it smoothly, without sharp jumps, which speaks of a successfully implemented cone - if the cone "breaks" or the material itself "rings", strong frequency response dances would inevitably occur. The only more or less significant frequency response unevenness is in the 400 Hz region. Judging by the step of the phase characteristic, I will assume that its cause is in the resonance of the centering washer. The step, however, is relatively smooth, so I won’t call this feature critical. The distortion picture looks, at first glance, atypical for speakers with a quality factor above 0.7 - usually, with a decrease in frequency, distortions begin to rise sharply. This is not observed here. It would seem, why? In fact, everything is natural. See what is the main reason for the high quality factor? In most cases - initially weak motors, which, at a resonant frequency and below, cannot hold the moving system and release it "into free flight". This leads to an increase in distortion. Here, high Qts is the result of the Faraday ring. At the same time, I did not just pay attention to the geometry of the coil winding - its lion's share is in the gap and works, and does not hang out of the gap. Hence - good control and atypically low distortion with a decrease in frequency. Moreover, the motor still allows a linear stroke of 2.5 mm (for the "stage" this is even more than usual), and until the speaker reaches it, the distortion grows slowly. For example, this graph was taken already at an average sound pressure level well over 110 dB (microphone at a distance of about 0.5 m). And that, let me tell you, is pretty loud. AND WHAT ABOUT THE SOUND? TRIAL IN ACTION Actually, the ears confirmed the measurements - the speakers sound unexpectedly clear up to decent volume levels. They are trying to climb up in frequency, and due to hard, but devoid of sonority cones, they do it without dirt. So the first conclusion is that they do not need large tweeters. There is no loudness in the upper midrange, but it was clear anyway: the frequency response is smooth, without sharp jumps. The lower midrange is a little lighter - here, I believe, the main reason was a slight dip in the 400 Hz region. But in the mid-bass range, the speakers turned out to be patient - they hold the beat well, not letting the diffuser flounder. WHAT IF… Of course, the main application of these speakers is SQL systems. Perhaps, it is so, because nowadays any loud chant is called “stage”, and not all of them can be called SQL. But I would suggest another option - home acoustics. The first-order low-pass filter will make the frequency response horizontal in the midrange region, while a smooth decline will begin above 3.5-4 kHz, and it will not be difficult to merge these speakers with tweeters. And from below, you can “pull up” the return with a bass-reflex design. You get sensitive acoustics that can be used even with low-power amplifiers, up to tube single-cycles. BRIEFLY TO THE POINT One of those dynamics that can be safely incorporated into SQL systems, including competitive ones. They take not by loudness and the desire to hit with a dray feedback, despising any musicality, but quite the contrary - by the absence of loudness and tonally quite even sound. At the same time, the return, for a moment, is also not weak: the reference sensitivity (real, and not the one that is usually indicated on the boxes) rolls over 93 dB / m / W, and this is a lot. In general, I liked that the speakers can sound clear, are well controlled by the amplifier and do not begin to “rest” prematurely with increasing volume. Of course, everything has reasonable limits, but if you set a goal to build a proper SQL system (including a competitive one), the second generation SWAT REV-80Pro is definitely worth considering. Neat assembly - no glue residue or crooked elements They sound unexpectedly even for the stage, without ringing loudness Climb up in frequency, do not require large tweeters Well controlled by the amplifier even with volume up Low distortion at low frequencies, "patient" mid-bass range
