Update on the March Audio speaker.
The speakers sent to me were the initial prototype speaker which are the same as the final design just more 'broken in' and less a final crossover mod (discussed below). I was completely fine with that. No sense in Alan building me a brand new pair just for review that he'd then have to sell at a discount as they had been used. Logical.
When I first listened, something sounded off. Remember, I test in stereo and mono for different reasons. This is important. I took some notes and moved on to the measurements.
I tested one and the results looked really out of whack so I contacted Alan. Long story short, since this was the prototype, the inductor hadn't been zipped-tied in place and Alan forgot to do that before he shipped it and it was knocked loose in transit. I verified by disassembling the speaker and sure enough... wiggle, wiggle. Rather than fix it right away, I put the other speaker on the stand. And... wow. Good wow.
I sent Alan the measurements so he could see for sure that the two measured different and we could tie up that loose end. The (good speaker's) measurement was as he expected so no news there. But, let's visit this quote from earlier...
Alan knew what to expect with my (good) result and had already accounted for a HF lift in the final crossover (that wasn't in the prototype board). Knowing that I was going to have to fix the busted crossover (for my listening tests) I thought, "hey, why not just have Alan send me the updated crossover so I can test what will be the true final version". So, rather than fix it, I asked Alan to send me the updated crossovers and I'll test the speakers with those.
Stay tuned for the final results. I'm not sure when the new crossovers will get here but I'll post and update when I get them.
In the meantime I can tell you that the measurements which have already been shared are really quite indicative of what I measured. I haven't overlaid them but I'd say to my eye they're practically the same. This might be one of the best measuring speakers I've seen so far, even with the current HF tilt. The sound power response also might be the most linear I have ever seen. Alan has done a superb job with these speakers.
(side note: to those who follow me on Patreon, this is the speaker I posted a sneak peak result of a couple days ago. )
The speakers sent to me were the initial prototype speaker which are the same as the final design just more 'broken in' and less a final crossover mod (discussed below). I was completely fine with that. No sense in Alan building me a brand new pair just for review that he'd then have to sell at a discount as they had been used. Logical.
When I first listened, something sounded off. Remember, I test in stereo and mono for different reasons. This is important. I took some notes and moved on to the measurements.
I tested one and the results looked really out of whack so I contacted Alan. Long story short, since this was the prototype, the inductor hadn't been zipped-tied in place and Alan forgot to do that before he shipped it and it was knocked loose in transit. I verified by disassembling the speaker and sure enough... wiggle, wiggle. Rather than fix it right away, I put the other speaker on the stand. And... wow. Good wow.
I sent Alan the measurements so he could see for sure that the two measured different and we could tie up that loose end. The (good speaker's) measurement was as he expected so no news there. But, let's visit this quote from earlier...
Received some more info about the speaker - tweeter is indeed SB Acoustics TW29BNWG-4 and there are some preliminary free field measurements made with the following note from Alan:
"Please note that the small lift in response above 9kHz has already been corrected by a crossover tweak. Otherwise its essentially +- 1.5dB. Listening window is very close to the on axis. As with the previous version F3 is around 45Hz and F6 around 38 Hz. In room the bass extends below 30Hz."
Alan knew what to expect with my (good) result and had already accounted for a HF lift in the final crossover (that wasn't in the prototype board). Knowing that I was going to have to fix the busted crossover (for my listening tests) I thought, "hey, why not just have Alan send me the updated crossover so I can test what will be the true final version". So, rather than fix it, I asked Alan to send me the updated crossovers and I'll test the speakers with those.
Stay tuned for the final results. I'm not sure when the new crossovers will get here but I'll post and update when I get them.
In the meantime I can tell you that the measurements which have already been shared are really quite indicative of what I measured. I haven't overlaid them but I'd say to my eye they're practically the same. This might be one of the best measuring speakers I've seen so far, even with the current HF tilt. The sound power response also might be the most linear I have ever seen. Alan has done a superb job with these speakers.
(side note: to those who follow me on Patreon, this is the speaker I posted a sneak peak result of a couple days ago. )
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