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Uour best speaker option maybe yo keep them.
If you or a friend can solder , replacing the not so great stock crossover parts with
Much higher quality crossover parts , are not that expensive
And can transform uour loudspeakers . I recently did mine and it was at minimum a 2- 3X the $$ cost upgrade. Everything is far more detailed and refined.
If Anyone has any questions tell me what uou have and I can at least make a few
Recommendations based on my 20 years in modding equipment.
You have not really let anyone know what improvement in sound you are looking to achieve. Larger Proacs will give you a bigger Proac sound. If that is what you are looking for, then go that direction. What about soundstage, what about total dimension, what about the TONE, air around vocals and instruments, instrument placement, definition, decay of notes? What does piano sound like, what does the sax sound like, what does the violin sound like? IMO your front end is the weakest link. How did I determine that, well I build DACs, preamps and phono stages. These custom made products do certain things that most people have never heard before. They bring out the systems potential. I don't know what you expect your system to do, but without all that information, it is hard to make a specific recommendation. I can change the sound of your system with just a few resistor changes, cap changes, or adding a choke. It could be that simple. Happy Listening.
My room is larger than yours (see my system page for full details on room and components) and I think I have plenty of speaker for where I listen. I only listed to the ProAc Studio 125 (beautiful midrange) and ProAc D20 before I ordered my 148s. Why did I go with the 148s? They have the same (non-ribbon) tweeter as the current D response line, same great midrange (125 still had better) and have better low end control with the 2.5 way design. I've heard the 148s are a more refined version of the 140 mkII as they went to different drivers.
I would consider the following upgrades for your 140 mkII ProAcs:
1. Get some Soundocity SEV9 outriggers. I use these and are much more rigid and stable than the factory ProAc spikes. The SEV9s are also flexible enough to use with other tower designs.
2. Upgrade your speaker drivers and crossovers to the 148's configuration.
Does anyone have recommendation for crossover upgrades for my Studio 148s? I would love to get my 148s even closer to the 125's midrange with an even more refined sound.
I have heard the Studio 148 and didn’t like it at all found it aggressive , rough and not enough agile compare to mine 140MK2,
Unfortunately I can’t audition the D48R in my country managed only to listen to the D20 which I liked very much but the bottom end was clearly missing ...the D48R seems like the ideal upgrade for me despite its very high cost .
If you're overall happy with what you have then the D48R seem the obvious choice if your comfortable with the price. It should really let your McIntosh sing. Just checked the ProAc site & it looks like they're updating the D30R to a D30RS, using the updated driver tech of of the D48R for a flatter frequency response, but not changing the cost. Could be an option.
Generally speaking I find the ProAcs to be more lively & exciting than Monitor Audio which is very neutral & refined, but less engaging. Of course this is more noticeable on their mid & entry level products than higher up the range, but still seems to hold true from what I heard at AXPONA. Anyways, I'll be upgrading from the MA Silvers to ProAc Studios next year.