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The original’s mounting-hole circle diameter is 59 mm, while the replacement’s mounting hole is 56 mm. The tweeter is a 1.125″ unit and is not a direct replacement, but it is close and it is easy to drill new mounting holes. I chose Dayton Audio’s DC130A-8, a 5.25″ woofer, which is a “drop-in” replacement for the original, and Dayton Audio’s ND28F-6 neodymium dome tweeter. So, I turned to the Parts Express catalog to see what I could find. I wanted to keep the boxes because of their size and appearance.įor my first task, I needed to choose a new pair of fairly well-matched drivers.
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It was not especially flat, and this - along with the first-order crossover network and the absence of a reasonably flat woofer - convinced me to update the drivers. I removed the capacitor and measured the response (see Figure 5). So this is a first-order network with a 6 dB per octave rolloff and a calculated 10-kHz corner frequency.
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The crossover is a 3.9-μF capacitor in series with the tweeter’s inductance and DC resistance. The tweeter is a 12-mm balanced dome with specifications unknown to me. Figure 4 shows a frequency response measurement.
I glued a piece of 0.125″-thick pressed board over the vent opening and used a hobby knife to remove the thin vinyl box covering under the “patch,” so the glue would adhere to the medium-density fiber board (MDF). The vent tube was lightly glued into the box front and is easily popped out with a broad, wood chisel.
I sealed the box and measured the response to determine if the dip would still be there. The woofer is the green line, the tweeter is the red line, and the overall response is the purple line. But, as expected, the sealed box response is flatter at the expense of a higher rolloff frequency.įigure 6: This shows the BassBox 6 Pro simulation of the updated MTX 5i with the Dayton woofer and tweeter. A larger sealed box would have a Q closer to the 0.707 maximum flat value. The sealed-box curve is for heavy acoustical fill because this provided the lowest closed box Q measurement (0.887), indicating that this box is a bit too small. I removed the vent in the simulation and produced the curves shown in Figure 3. The simulation indicated that this woofer was equally suited for both a vented or sealed box. The 150-Hz peak and the 500-Hz dip are at least partially responsible for the weak midrange (more about that later). Except for the peak at about 150 Hz, the curves are not very similar, but I think the measured response is more reliable. Figure 2 shows the simulated and measured responses. I also measured just the woofer in the vented box.
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I measured the box dimensions and then used Harris Technologies’s BassBox 6 Pro simulation software to model it as an unfilled, vented enclosure. I measured Vas with the added-mass method. I used Dayton Audio’s WT3 woofer tester (which was recently replaced by the Dayton Audio Test System) to measure its Thiele-Small values with Dayton Audio’s WT3. I disassembled one of the units and removed the 5.25″ woofer, which I suspended in free air. I wasn’t content to just examine the overall frequency response, so I decided to dig deeper.
My test determined that the reviewers were right about the MTX 5i’s weakness in the midrange frequencies (see Figure 1). (I used a Tenma 72-7260 sound-level calibrator to achieve absolute calibration at 1,000 Hz.) I used TDL Technology’s Model 411 measurement microphone amplifier as a microphone preamplifier. With groups of three, you can self-calibrate by comparing microphone pairs. The microphone was one of a group of three Behringer ECM8000 electret condenser microphones or one of a group of three Dayton Audio EMM-6 electret condenser microphones. The graveled ground scattered the noise and minimized direct sound reflections. I mounted the measurement microphone on a plastic tripod, which I could place up to 30’ from the speaker.
I placed the test speaker on a wooden platform about 4’ off the ground. I used a speaker cable and a microphone cable that run through the wall outside my computer room to measure the loudspeaker performance. So try to minimize sound reflections into the measurement microphone.) (Quick Sweep is not gated, which means the measurement time is longer than the signal duration. I used True Audio’s TrueRTA Quick Sweep Version 4.0 spectrum analysis software and pink noise to conduct a listening test and make an outdoor measurement. Except for the 150-Hz peak, the curves are not similar. I used TrueRTA Quick Sweep software for the measured response (green circles). Figure 2: The frequency response of the original MTX 5i woofer in a vented box (green circles) is compared with a simulated response (blue triangles) using BassBox 6 Pro software.