Adding my two cents as a former reviewer who is happily no longer reviewing:
I wouldn't be surprised if the 85th edition measured a lot better.
- This is an old model, and while I'm totally okay with it being measured -- it's still on sale, and people still buy used, after all -- I don't think one should assume what applies to a current model will apply to an older one. The LS50 measures totally different from the LS50 meta, and those look nearly identical. In this case, the 80 and 85th are completely different speakers with different drivers, driver placements, and driver sizes.
- I strongly believe it's not the reviewer's job to find the "optimal" way to listen to a speaker (or the buyer's for that matter). The manufacturer should tell the you that, and they should do so very explicitly. If the manufacturer fails to do that, than any reasonable way of measuring or listening to the speaker is fair game. On the other hand, if they do make an explicit recommendation, that should be your primary way of testing the speakers.
(I don't think the designer mentioning that the speaker is better with the grille in interviews and other contexts really counts; included documentation is part of the product.)
To that point, the Denton 80's manual makes no mention that the speaker sounds best with the grille on (neither does the 85's for that matter). It's not a reasonable thing for users to expect either, as it's almost unheard of among modern speakers. At best, one expects grilles to be transparent, not to actually make a dramatic sonic improvement.
- Notably, however, the Linton's manual does tell you to keep the grilles on. That right there is the difference with the Denton, as the difference is so clearly spelled out with the Linton's manual, including the fact it improves directivity not just the on-axis FR: "Additionally the drive unit dispersion is aided by the front grilles which should be left on for optimum listening performance. Removing the grilles will produce a brighter but less smooth sound."
- Keep in mind that if a speaker sounds and measures dramatically better with the grille off, that's also a bit of a design flaw. I know you'll always have to compromise on one or the other, but it's a bit of a problem if one method is so much better than the other if you expect buyers to use a product both ways. One could argue Wharfdale should have made the grilles permanent on the Linton, given how much better it measures and seemingly sounds.
It's also bit annoying as a consumer: I way prefer how the Linton looks with the grill off, and that's the photo you see in ads and on the website. I'd be pretty disappointed to buy one expecting to use it with the grille off only to find it is officially and measurably better with the grilles on when I received it.
I wouldn't be surprised if the 85th edition measured a lot better.
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