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You’ll often find people doing multi-DD for headphones as a joke, recently. Simply spamming dynamic drivers isn’t enough. Audio engineering is like cooking: you can have the finest ingredients, but if you can’t cook them properly, the dish will still turn out bad. And I say this as a fact because there are single DD IEMs that beats multi-driver IEMs.
My good friend, a handful of engineers, and I have been working hard to make multi-DD headphones viable. In the past, there were a few dual-DD headphones, but they were used for quadraphonic, or four-channel audio, which never took off because four-channel vinyl couldn’t hold enough music. With the death of the format comes with the death of the quadrophone concept. Later on, gaming headsets reintroduced multi-driver setups, again, marketed mainly for multi-channel surround sound and not sound quality.
Long before Pud made, the BOB, a headphone with FOUR 50 MMs!!! Peerless drivers, I made a triple-DD headphone as a joke and for curiosity sake. I angled the drivers at 30 degrees, same banking K280 parabolic as to on-paper minimize comb- filtering but it didn't work out because comb filtering is still severe and the drivers used are treble screamers with 20db of upper treble.
Now in the present day, after many years of trials and errors, I've finally made dual-DD that can do things that single-DD can't do because it would be physically impossible as you can't break physics but work around it. To be continued...
During the development of their headphone, the Hendeka, I was there to witness its baby steps. For many years, Omne Audio engineer Leong, the man behind the Hendeka, had been trying many ways to make their excellent-value headphone. One of his great innovations or discoveries is the Resin Baffle. He initially just wanted to construct the headphone out of resin instead of Fused Deposition Modeling (FDM) plastic because it was more aesthetically pleasing, and the improvement in sound was a bonus. The sound was so good during trials that many people who didn’t like the Hendeka with the MJF Multi Jet Fusion nylon (MJF) baffle instantly loved it, and I was one of them. He also didn’t tell anyone who had tried the older iteration that anything had been changed so it was a true blind test. Do note that Resin isn't the only thing they've changed it was the pads and some extra touches but Resin alone improves the sound.
I have personally tested Phenolic Resin (CNC), Nylon (MJF/ SLS), ABS (FDM), ASA (FDM), PET (FDM), PETG (FDM), Fiberglass (CNC), and Carbon Fiber infused plastic (FDM). And I agree that resin is amongst the best for solid-baffle setup. It's so good in-fact it's now a standard for my flagship products.