Pioneer VSX-LX504 9.2-ch AV Receiver Official Website
Just finished setting up my home theater, centered around the Pioneer VSX-LX504 and coming from my previous Pioneer VSX-LX503 receiver: LX503 Owner's Thread
Front speakers: PSB Imagine X2T (review: CNET review
Center speaker: PSB Imagine XC
Surrounds: PSB Imagine XB
Atmos Add-ons: PSB XA (4 total)
Sub: JL Audio Fathom f113 v2
4K UHD Player: Panasonic DP-UB9000
SACD/CD player: Sony UBP-X1100ES
So right off the bat, I'm noticing a pronounced bass in all speakers compared to the Pio LX503. Punchy and a lot deeper. This bass was even more pronounced after adding a pair PSB X2T floor standers, which are already bass heavy to begin with. Not sure I like it, but we'll see if I get use to it as time passes. After installing the newest August 1st firmware for the LX504 (which officially adds support for IMAX Enhanced movies), I grabbed my copy of 4K IMAX Space Station Blu-ray disc and placed it into the Panny UB9000 tray. I wanted to hear for myself if IMAX Enhanced was just marketing shtick or an actual benefit to home theater users. I went in feeling skeptical, but after the first few minutes I could actually feel myself being inside a large movie theater. Every sound, from the narrator's voice (Tom Cruise) reverberating to the actual content I was seeing onscreen just sounded bigger than my actual living room. I FELT like I was inside an actual large movie theater. Not so much the loudness of it all (when the shuttle's thrusters blasted off I thought I would go deaf, had to lower the volume immediately!!) but just the larger spacing I felt. I live in the city, and my apartment living room dimensions are rather quaint (13'x11'x9' ceiling). But listening to the IMAX Enhanced track just opened up the soundstage. I know that's usually a term audiophiles use when describing speakers/amplifiers, but I feel it applies to this scenario. Everything just "opened up" in my small apartment living room and made everything feel spacious. I'm convinced the IMAX Enhanced track made a big difference in my viewing/listening experience. The only drawback I see going forward, is the lack of IMAX titles available. Unless some miracle happens between Disney/IMAX/anyone else, and we start getting IMAX 4K Blu-rays like Avenger's End Game or other IMAX titles, I don't see how else to take advantage of this new codec. There's only so many IMAX documentaries you can watch before you want actual movies to show off your new IMAX Enhanced receiver...
As far as music goes, I will leave this one out until I get my Sony X1100ES for media playback. Should be picking it up either tomorrow or Thursday from BB. So for now, that's all I will say other than I am (so far) a very happy camper with the Pioneer VSX-LX504.
Final note: I haven't even calibrated it because I misplaced my calibration mic included in the box. So I just did a manual setup, changing the speaker config settings; like distances and crossover. I feel when I dial in the proper settings using the MCACC Advanced calibration (once I find the damn calibration mic) everything will sound even better. Haven't even considered a professional video/audio calibration yet, but I'll look into that as well later in the year.
More impressions to come...