Originally Posted by jlpowell84
As Beast said...the 2453 is exact same as 2452. The 2452 stock does need upgrade diaphragm to essentially be equal to the 2453 but thats not the point here. The 2453 is $270 and by far best bang for the buck. The 2452 is $425 (not sure why), then the stock diaphragm is removed and replaced with the Truextent BEX4008 Beryllium diaphragm. Rob did major documentation and measurements on this when he provided all of us with the great 2453 info and how to proceed. Currently the BEX4008 is $725 on Speakerex and up from 550 then 6 something in last two years. As that stand we are looking at $270 for the 2453 vs $1150 for the 2452/BEX4008. I do have a call into the metals company 'Materion' who manufactures these Beryllium diaphragms to see if I can buy direct or better price elsewhere.
The DIY option I am going with will be my final speaker change, I am barely motivated enough to do this/Pallet up my JTR 215RT trio and ship, but I am. The CD has been explained, it will have a single JBL 2265HPL woofer, STX825 90x60 coverage horn, running active from a Hypex FA253 plate amp working with Rob to develop the proper DSP settings in the Hypex. I expect cab size to be around 19widex12deepx32tall. This will essentially be a upgraded type 4722 clone in sound. I lose the advantage of the large wave guide/horn, CD will need to be crossed little higher but horizontal dispersion is the same 90 degrees (which was important for me) and won't have the max spl a ported larger dual woofer 4722 has but thats fine as it will still be way more than I need. I do gain the advantage of Beryllium. I have not heard beryllium before so perhaps some risk there, but for me the 2453H-SL was my fav high frequency driver I ever heard or owned. So this theory is to take that exact same sound from the super dynamic 4" CD and ad a little sweetness on the top with the BE phragm. This is the theory, just need to execute now...
Edit: CD price diff (unless I find better) is 270 vs 1150 per and we need that 3x so 810 vs 3450. A little disappointing Speakerex has raised $200 in around 24 months but Materion prob raised prices. This same CD option can be done on the 4722...
Just to clear up a couple things.
The designation letters at the end indicate different parts.
2452 and 2453 are the main models.
The H indicates 8 ohms
the SL indicates Select, an upgraded diaphragm with Aquaplas coating. Without that, the 4" CDs are not good to use.
The 2452H-SL is slightly better than the 2453H-SL, but much more expensive and not worth the price difference unless you're planning to go with a Be diaphragm. As mentioned, the 2453 has the diaphragm soldered to the rear cap. The 2452 has a diaphragm you can replace.
The 2432H was the original compression driver in the 4722. It is a ribbed 3" Ti diaphragm without any coating.
Do not buy a 2452H or a 2453H and expect good performance. You will not get it. The -SL part is key, and goes a long way to killing resonances in the diaphragm.
The Truextent Be diaphragms in a 2452H is truly endgame stuff. The dynamics and clarity are amazing. Breakup modes are pushed above 20khz. Great stuff.
If you're just using for movies, probably not worth the Be upgrade, and the 2453H-SL will do fine. That said, the 2453H-SL is still excellent, and incredible value.
The 2453H-SL is similar to the 2452H-SL, but not exact. The 2452H-SL measured a touch better up top.