Update: even with the careful installation of the foam gasket, I started to get the dreaded error code on a regular basis. So I went overboard with a nuclear option!
I ordered some black gasket maker and after removing the foam gasket completely, I took one of the nitrile O rings I have...
Update: after much fiddling, I have gotten the system to a volume/drone level that I can tolerate. The downside is that I am more of a fan of higher-pitched harmonics but if you try to quiet down a 4cyl with typical tools (ie not a helmholtz res) you are going to deepen the fundamental frequency...
Update: after much fiddling, I have gotten the system to a volume/drone level that I can tolerate. The downside is that I am more of a fan of higher-pitched harmonics but if you try to quiet down a 4cyl with typical tools (ie not a helmholtz res) you are going to deepen the fundamental frequency...
Second 1142 ordered after consulting Google Gemini, which was surprisingly helpful and technical!
Plan is to install it next week, after thanksgiving weekend.
Outcome: significant narrowing of the range of drone, now centered at 3k. Drone sound level reduced by about 50% but not eliminated. I may replace the vibrant 5" diameter bottle resonator with a second 1142 after thanksgiving, which should further reduce low frequencies while bringing back some...
I'd say the PRL is the better design with the EPDM molded rubber vs sleeved design of the 27won which is more likely to degrade faster.
That's why I chose PRL and it's the best mod I've done so far
I went through a headphones or nothing phase several years ago but I'm not deep into it anymore. Too many hobbies!
Now I just rock an Audeze LCD-X on Topping gear when I'm in the mood at home. Nothing fancy.