Originally Posted by deepstang
Thanks Mr Julius. Great info. So with that flat REW, what were your honest impressions on the differences you HEARD (slight, dramatic)?
I now have a flat REW with my dual Sentinels, but still feel like I am hearing muddiness and cancellation at certain frequencies.
This is my REW graph.
Dynasty and Epic crossed at 40Hz
1/3 octave smoothing:
As you can see the graph is relatively smooth through the crossover transition (24dB Butterworth slope at 40 Hz) and generally follows the REW curve.
The sound difference between this and no crossover of these subs is hard to put into words without cursing. As always YMMV. Maybe proper placing of these subs (if there is one in my environment) would make them play nicer together, but my placement options are limited. As my wife puts it..."We're trying to live in a society here"... so end tables and such wouldn't work.
I tried doing a Hard Knee Curve using additional filters on the DCX. I didn't care for that at all. My mid-bass all but disappeared. I used my RS meter to test for my house curve. My house curve between 30Hz and 100Hz is about 12 dB. The REW graph pretty much shows this, so having a curved response SOUNDS FANTASTIC.
Last night I was playing 70's music (stop laughing) to see how that sounded. WOW !!! I have been hearing these songs for quite some time and I can honesty say that I have never heard such clean bass notes...ever on any system that I have owned. The rest of the notes sound pretty dern good too with my new Klipsch RS-82 II fronts
One nice thing about the DCX2496 is that you can sit and watch, via the lights on the front panel, just when each sub engages and how hard. I thought that a lot more good musical bass resided below 40Hz. It's pretty cool to see the Empire (sub2) firing during certain notes then the Dynasty (sub1) kick in as they go down further and seeing both subs firing away and sounding this smooth.
As far as your Sentinels go I'm not very technical as to why certain frequencies may be canceling each other out. Maybe someone else can jump in here or post your REW graph and someone may see something. The waterfall graph may be the most revealing but I don't have a clue as to how they are read. I just got REW running a couple of weeks ago.
As far as muddiness goes I can say that the Antimode REALLY did help me there. If I turn it off with the crossover intact I get some boominess out of the Dynasty and an overall crappy sound. If I have the Antimode off and the crossover off as well...Yikes
I can't tell when a bass note starts or stops.
Currently I am using NO filters on the DCX, just the crossover and the Antimode upstream. I tried adding additional filters on the DCX and while they may have flattened the peaks, nothing sounded better overall than the simplest approach.
I now get a good bit of mid bass slam with one Empire coupled with the Dynasty. I never had this with the Dynasty alone. I can only imagine those with two or four Empires and what the slam feels like. Not having heard two or four Empires I would still bet that I would want to have an uber low sub mixed (and crossed over) in there somewhere. My single Empire just doesn't dig as deep into the HT explosions and current music tracks as the Dynasty does...and does so very well