Originally Posted by Droidboi
Hello, i have 2 svs sb 1000's and 2 Reckhorn bs200 bass shakers. They are connected connected to my reciever like this: rca splitter from reciever, one going to the subwoofers (done by Daisy chaining them) and the other one connected to my Reckhorn A-409 amp where the bass shakers are connected to. Both the subwoofers are set at 3 o'clock and the gain on the reciever is set to -7 (i have measured with REW no better spot for them). As for the bass shakers, the amp has that clipping warning on the front which i have not seen ever being lit up so i assume i'm not overdriving them.
When watching the 4k bluray of Blade Runner 2049 i noticed both the bass shakers and subwoofers distorting (sounds like bottoming out. The thing is, i never play loud at all. My room is very small (700 cubic feet) and i rarely even hit 80 db so i don't push them hard at all from the reciever.
Lastly, if anyone out there has this disc i would like to hear how your subwoofer/bass shaker handles the scene at 1:01:46-1:02:18?. Turning the volujme down i can't hear it at my listening position but if i go right up to the subwoofers i can hear it. Could this distortion come from the source perhaps?
If going by receiver volume, 80dB is actually reference level (or 0dBFS) for D&M receivers which is very loud, or do you mean you measured the levels with a microphone and the bass doesn’t hit 80dB often?
Are you running a HPF on your shakers? If so, try adding a lower one and replay the scene you’re having trouble with and tweak to taste.
I just played this timestamp at reference to check for you, and sounds great on my end. There’s quite a bit of ULF in this passage when the car is brought down with strong 25-30Hz and decent output down to 10Hz and a little below, but nothing that makes any awkward noises for me. If this is the only time in the movie you noticed it, there’s much heavier passages with deeper content that I would have thought would bottom out your shakers easier.
Try the short car landing scene at the beginning 0:03:40 and see if you hear any bad noises, lots of similar waveforms to the scene you had trouble with but even stronger output. That’s basically the entire sound design for the movie focusing on very strong 25-30Hz with some much deeper tones sprinkled throughout.
You shouldn’t be hearing anything bad from the subs either though, so it’s possible it’s distortion on your end. This is a very demanding movie for a pair of SB1000 to replicate at high volumes, but their DSP limiters are set very well to prevent what you described. It’s not a popping sound is it? That could be clipping, depending on your signal chain; this movie LFE is mixed very hot.