Originally Posted by Molon_Labe
Go to the larger AV and pro audio forums and post a thread - Avoid JBL 7 series - Inaccurate tuning files. They will likely respond to this type of activity as it negative press and potentially revenue impacting.
Originally Posted by DS-21
That would not be fair. I've long been saying the decoded filters* were wrong because I measured the 705i and 708i both incomplete and with the remaining filters (BSS), and also measured the line output from a BSS processor with the filters engaged. So I knew with complete certainty that the decoded filters were wrong. I also knew the speakers perform as intended when used properly.
*"tunings" sounds stupid and pretentious to me, so I will use the standard language.
Why would it be unfair exactly? In the case of the 708i, they've taken a passive speaker that requires 16 biquads of active EQ to correct its response properly, and in the DCiN amps, have omitted half of these filters. Furthermore, these omissions weren't based on determining which filters have the least effect, but by arbitrarily keeping the first 8 in the order of their presentation in the London Architect software. This includes omitting a PEQ with a 4.2 dB cut at 740 Hz with half an octave of bandwidth. That's a non-trivial omission.
When confronted with these facts, they lie, and claim that the filters are hidden in the Audio Architect software for the DCiN.
It's worth noting what they claim a "tuning" (their words, not mine) consists of for the DCiN amps. From the manual, page 39, they say:
The advanced panel includes every parameter implemented in a speaker tuning
So, what is "every parameter implemented in a speaker tuning" for the DCiN exactly? Well, here is a capture:
According to them, "every parameter implemented in a speaker tuning" consists of "8 second-order filter sections" (that is, biquads), even though it takes 16 biquads to do it properly, and they have room for the additional 8 in the input filters, but blow off their users by omitting them.
People call them "tunings" because that's what Harman calls them in their own documentation.
When you say, "the speakers perform as intended when used properly", it should be understood that "used properly" excludes using DCiN amps, because half of the required biquads for their equalization are omitted.