Right, it's a function of throat area, so with a 1" which starts out at > 4 kHz min. it takes a very long, slow expanding horn to go low with 'authority'.
Don't recall, but W.E. had a 6 ft long stage monitor horn for the 555 1" driver. There use to be a picture on line of Judy Garland speaking through one [no driver] doing a vocal test, but can't remember exactly what at this point and no longer have the link 🙁:
Live from Munich : High End 2016, Part 3 - Silbatone'''s Trumpets | Horn speakers, Car audio battery, Hifi audio
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Merit?? You could simply buy a pair of those Eminence ( HA1-14 ) adapters and form your own opinions.
Yes, the XT1464 ( being a longer ) horn extends lower than the 152i clone ( though as I showed above > the limiting factor for achieving lower usable extension will also be any drivers Fs // suspension ).
Anecdotally, I sent an LHF alumnus a pair of my Peerless DFM2535 drivers ( as well as a pair of Celestion CDX1-1747 drivers ) along with the necessary capacitors to allow for "apples to apples" comparisons when mounted to an Altec 811b horn ( & used in the owners mostly stock Altec 846B Valencias ).
He didn't like the Celestions ( at all ) while the smaller Peerless driver acquitted itself very well in a direct comparison to his GPA 902-8a ( that this user had upgraded to from the hapless Altec 806 ).
- He ended up concluding the little Peerless was a worthy upgrade ( especially for the low monies it sells for ) if a user can't afford GPA's pricing regime.
His Valencias used the N800K crossover ( BTW ).
🙂