Yep looks like Audiosense actually want to finally make some money, fear they've made a rod for their own back with the T800 being so cheap, at that point I don't believe any other company (even chifi) were selling over 6 Knowles BA for under 300usd. Now there are several but are any of them making any meaningful profit. If eg Shure released a 6 Knowles BA at around 500usd we'd think what a bargain, normally be twice that. Seems we're rather spoilt consumers these days
I bought a 5 Knowles BA from Hisenior (the Hisenior B5+) at $78 USD during sales, usually that set is just slightly above $100 USD.
Actually I spoke to a CHIFI manufacturer before, they say there are grade B Knowles and higher grade Knowles drivers used in CHIFI. Now I'm not saying that the companies above are using lower grade Knowles to make it so cheap (I'm actually very happy with the sound quality Hisenior and Audiosense provides in the gear I've bought from them so far), and I'm very appreciative of the great price to performance ratio of the Audiosense T800.
I've always liked Knowles compared to Bellsings cause the Knowles timbre sounds more natural with less harshness, and Knowles sounds more clean and less edgy to me. And Knowles has the reputation as it was the "original", but as you can see from this lawsuit (https://www.reddit.com/r/headphones/comments/cxqlje/knowles_files_claim_with_us_trade_commission_to/), even TOTL sets are using Bellsings (cough cough Solaris). Saving money aside, their engineers must recognize that Bellsings ain't that bad in sound quality to be able to be stuffed into a TOTL summitFI set?
But yeah we have to be thankful to the CHIFI gods for providing such good quality for us nowadays. I remember just 3 years back, a Westone single driver knowles set could set you back $100 USD at least. A triple knowles Westone set cost me $400 USD. Now we can get a single Knowles CHIFI at $30ish easily, and a multi knowles set like the Hisenior B5+ at sub $100. Amazing times (or maybe we have been fleeced by Western brands previously haha)!