Unfortunately, the issue may be the equipment (the center speaker at least). The CS8 would seem to be well-suited to be a center speaker, but maybe it's not.
I only mention this because you list the equipment as new
, but if still within the return window, and not too much of a hassle, try a different speaker. If results are the same, go back to what you had.
If you got these on sale (like that BB 50% off), that's a tougher decision of course. (If you didn't get them on sale, at least get a price match vs BB!)
Something simple to try that may seem silly, but's only a little hassle, is to use the Presidians as front L/R, and compare CS8 to a single CS5 (or 2x CS5s in series, if you're bored) as the center to see if it makes a difference.
If you want an option to try, some Infinity Reference speakers are currently on sale, greatly reduced at harmanaudio.com (but for some reason not the direct infinity site).
RC252 should meet your needs, should outperform the CS8 and isn't a terrible price increase to the total set of speakers. The RC263 is an significant upgrade for not a lot more, but is physically outmatching the other speakers.
If you fall down the rabbit hole, and are willing to replace/spend more, the RC263 + 2x R162 or even RC252 + 2x R152 should be a notable upgrade across the front LCR compared to the Sonys.
All the Infinity/Harman speakers have free shipping/free returns. Also, check when they'd arrive, since for me they'd arrive in 2 days(!). They might be able to show up in time to go head-to-head with the Sonys before the return window closes.
Originally Posted by thedjs6
My equipment consists of two new Sony CS-5 front speakers, a Sony CS-8 center speaker and they are connected to a new Sony DH-590 receiver.
Is there something I could do different that might make hearing the dialogue from TV programs and movies better? (without ditching my equipment and starting all over)