![]() ![]() The tripod arrangement worked well for my usual nearfield monitor installation as it enabled some toe‑in angle even on my relatively narrow monitor shelves. While four feet are supplied for each monitor, the Epic 5 underside panel actually offers five tapped mounting positions, the extra one being located on the centre line towards the rear to enable a tripod arrangement. The neoprene pads offer both some slip resistance and a degree of mounting compliance, if that’s desired. Also supplied are some cupped neoprene pads into which the foot tips can optionally be seated. Locating the ABR in the underside panel clearly results in constraints on how the Epic 5 can be mounted, so the monitors are supplied with height‑adjustable, blunt‑tipped, conical feet that raise the ABR panel a suitable height above the mounting surface. So it’s not usual to see an aluminium diaphragm bass/mid driver paired with a large‑diameter tweeter. The primary downside of aluminium diaphragms is that their resonant behaviour at higher frequencies tends to be very lively and difficult to control, and that demands steep crossover filter slopes, a low crossover frequency, and consequently a tweeter that’s happy to work down towards, or even sometimes below, 2kHz. Phil Jones’ AE1 design demonstrated very clearly that aluminium diaphragms could work, and displayed some major positives: they’re relatively light, they’re rigid, and they can work as effective voice‑coil heatsinks. The contemporary use of aluminium for bass/mid diaphragms can I think be traced back to the success of the Acoustic Energy AE1 hi‑fi speaker/pro monitor in the mid 1980s. A larger tweeter that can work to a lower frequency also offers more freedom of crossover filter design, which on the Epic 5 comprises fourth‑order (24dB/octave) low‑pass and high‑pass filter slopes at a relatively low 2kHz.īefore I move away from the Epic 5 drivers, perhaps a paragraph’s diversion on the subject of using aluminium for bass/mid driver diaphragms might be interesting. The downside is slightly narrower dispersion above, say, 10kHz, but to my mind that’s probably more than compensated for by potentially reduced distortion towards the lower end of the tweeter band, and in reduced thermal compression resulting from a larger diameter voice‑coil. Larger tweeters seem to be somewhat in vogue in contemporary speaker design. Both the bass/mid driver and tweeter use aluminium for their diaphragm materials. Any help would be appreciated.Speaking of drivers, those of the Epic 5 are a nominal 120mm‑diameter bass/mid unit and a tweeter that, at around 30mm, is slightly larger than the more common 25mm. Does that have to be reset so it does the full sweep again? I realized that on the first pass, the blue load bar on the bottom went from the beginning to the end, a full sweep, Generator reading Meas.Sweep.(took about 4 secs.) Now as I continue to try it I notice the blue bar is already at like 95%-98% and it loads when I hit the start measure.(takes like 1 sec). I removed all and tried again but, it's doing what it did the other night. I hit start measure and I got a graph (it didn't look right, there was a little graph line and another little graph line above it, both didn't fill the graph, but at least I got something), I adjusted the SPL,I checked levels it says input OK. I have core audio default input set to the mac default line in (audio card with RS SPL meter) and default output set to 003 (fw400 from mac to 003 spidf from 003 to JBL monitors). In apple prefs sound I increased input gain. So I've been trying to get the right hook up for this program, I haven't been able to, so I figured I'd use the RS SPL meter again to try to get some kind of readings. I would hit start measure several times and I was unable to get a graph. I tried several more times, sometimes level was ok, sometimes not. I set SPL as advised, checked level, level was too low but I hit the start measure any way. The other night, I used the radioshack meter into line in on the mac pro sound card. So I just tried again as I did the other night to at least getting some kind of signal into REW to create a graph, any kind of graph. (I have Radio shack spl meter,digi003rack,UA la610, JBL monitors spidf from 003, and getting a headache) I'm on a Mac Pro, I've been trying figure out how to calibrate sound card and get an AT4050 into sound card. ![]()
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