Standard practice and what you will find in my book (The Loudspeaker Design Cookbook) is Xmax= (Hvc-Hg)/2, so with a voice coil length of 8.85 mm and a gap height of 6mm, Xmax is 1.43mm. SB uses its own definition of Xmax, which is why it’s different. LEAP TSL parameter calculation results for the NERO-6MRN150D correlated moderately well with the factory published data, except for the Xmax numbers. Table 1 compares the LEAP 5 TSL data and factory parameters for both of NERO-6MRN150D samples. The 1V TSL data was selected in the transducer parameter derivation menu in LEAP 5 and the parameters created for the computer box simulations.
Again, for the reasons stated earlier, I did not use the LTD modeled T-S parameter data, but only the 1V TSL modeled T-S parameter data. I then divided the voltage curves by the current curves to generate impedance curves, derived the phase using the LMS calculation method, and imported the data, along with the accompanying voltage curves, to the LEAP 5 Enclosure Shop software. The collected data, in this case the two 550-point 1 V sine wave sweeps for each NERO-6MRN150D sample, were post-processed. After this observation, I decided to keep with the more conventional single voltage (1V) TSL modeling data for the enclosure simulation.įollowing my established protocol for Test Bench testing, I no longer use a single added mass measurement and instead use the physically measured Mmd data (14.1 grams for the NERO-6MRN150D). This behavior rather invalidates the LTD parameter measurement model, and indeed the Thiele-Small (T-S) parameter results for the multi-voltage testing did not correlate closely to the factory data. Figure 1 shows the comparison of the 1V impedance (solid black curve) to the 15V impedance (blue dashed curve), and except for a minor amount of resonance shift, the resonance shape remains fairly constant. However, it become apparent that this midrange is so stiffly suspended that increasing the voltage does not cause the voice coil to ride out of the gap.
Nero 6 audio driver#
I began testing the NERO-6MRN150D using the LinearX LMS analyzer and VIBox to create both voltage and admittance (current) curves with the driver clamped to a rigid test fixture in free-air at 0.3, 1, 3, 6, 10, and 15V. Last, the voice coil is terminated to standard solderable terminals. The neodymium ring magnet is sandwiched between a milled front plate and a milled and shaped back plate. The NERO-6MRN150D’s neodymium ring magnet motor was FEA-designed using a 49.5mm (1.95") diameter voice coil wound with round copper-clad aluminum wire (CCAW) on a non-conducting glass fiber (Til) former. The motor design on NERO-6MRN150D utilizes a neodymium ring magnet fitted with an aluminum shorting ring (Faraday Shield). Compliance is provided by a flat foam surround in the tradition of the Audax PR170 or some of the early PHL mids, while remaining compliance comes from a 3.75” diameter elevated cloth spider with constant height waves. The cone assembly consists of a curvilinear paper/graphite composite cone and a 60 mm (2.25”) diameter convex paper dust cap. Additional cooling is provided by a 20 mm diameter pole vent with a 26 mm flared exit. In terms of the NERO-6MRN150D’s feature set, the frame is a proprietary four-spoke-cast aluminum frame, and includes four 40 mm × 12 mm screened vents below the spider (damper) mounting shelf.
Nero 6 audio pro#
The driver SB sent to this Test Bench is a new 6.5” pro sound midrange from the new SB Audience OEM NERO product line, the NERO-6MRN150D (see Photo 1). Figure 4: Cone excursion curves for the 70V curves shown in Figure 2.
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