Freq Response curves . . . talk amongts yourselves
ncstatesman
Posts: 145
below (hopefully) is a chart of the freq response curves of my Polk 650 & SVS16-46PC . . . I used the correct RS meter comp values and identicle rvr and other settings to make sure both were on the same level. I did this ineteresting excercise to help me blend in both subs w/the rest of my system . . as you can see, both subs are diff by design . . .the SVS is deisgned primarily for low end response . . . .
Post edited by ncstatesman on
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i'll have to figure what went wrong . . done this before and it worked . . .
http://ncstatesman.tripod.com//sitebuildercontent/sitebuilderpictures/650_1646pc3_1.jpg -
how do you like your svs? do you think it is beter than a box type design sub?
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That's interesting. Could you describe in a little more detail, the procedure you used to plot the response curves?
Jason
BTW, I had to copy and paste the link to see the graphs, but then it worked fine. -
sorry could not post the chart here for direct viewing, I'll try later as it worked on another site before.
Anywhoo . . . Here's a simplified overview of the procedure I used:
. . . . I used my RS meter to set both subs to the same loudness (-20 on my onkyo 898 vol dial), both were hooked up to the LFE out of my rcvr, turned one sub off (all other speakers were off too) and left the other one on, then played an Autosound#102 cd that has sinewave test tones at every frequency Hz from 10 to 98Hz, recorded the values off my RS SPL meter for the slected freq's shown on my web link, entered it into excel sheet and chart, and in a nutshell, there you have it.
Note that I took my readings from the same listening position and that my response curves incorporate the RS SPL meter compensation values. It's an interesting to excercise to see how you subs perform in your listening environment and where Equalization is needed to 'flatten' the response curve - as you can see, I have quite a few peaks/valleys that I need to straighten out -
Pretty impressive low end extension on the SVS. Not that the 650 is bad, taken by itself--It had pretty good response down to 30Hz or so. But, golly, the SVS went down to, like 12Hz? Do your walls rattle? I'd be afraid my house would fall down!
Those Radio Shack SPL meters aren't even supposed to be very sensitive below 25 Hz or so, are they? -
to be honest, the Polk just can't compare to the SVS, primarily due to the low end capability of the SVS. Also, box subwoofers, as I've been reading, typically cannot match the low end of response of cylinder designs.
The walls and stuff will rattle a little if things are loose, but it will not damge anything, it's the loose stuff that resonates sometimes. But this SVS sub is so powerful that my next door neighbors (i live in a house) could hear the low bass rumble from their living room whne I was playing Pvt Ryan and their windows were rattling, which caused them to step outside on their porch to see what was up, they said they could feel some of the low freq HZ vibrating on their chest - it's really awesome. Now, most people really may notneed or care for this kind of bass, and for them, the 650 is great, but if you want more low end AND powerful low end punch at that, then SVS and some other's (like HSU) are the way to go.
Originally, I had the RM7600, now I'm upgrading to more substantial Polk spkrs like CS400i, RT800i, and either f/x500i or RT35i or 55i, so I'm going to sell off my rm7600 and 650 sub soon. perhaps on E-bay. Don't get me wrong, the 7600 w/the SVS is a great sounding combo for me, But I want more of the higher end Polk stuff . . -
Here's the link for my response curves . . . . http://ncstatesman.tripod.com/angelswebsite/id2.html
. . . . . I tried to post the actual charts on this window, but it doesn't work for me . . . . -
yeah, tripod won't allow you to view the image files in other applications apparently, i had this same problem.
so, after all your testing, are you running both subs, or just the SVS? -
Howdy Juice,
now all of a sudden my chart is viewable on this post, when I tried it on saturday, it wouldn't work . . anways, I'm trying to see if both subs can happily co-exist, running both subs is giving me headaches with the respsonse curves I'm getting - as you can see, too many peaks and valleys that I may never be able to smooth out with two diff subs, so I'm going to sell my 650 along with my RM7600 as I'm in the process of upgrading to higher end Polk stuff. I have my new 400i, 800i, but need to get either 55i, 35i or even f/x500i's to go to 7.1
I just orderd a paramteric EQ to smooth this out. Also, I may trying to achieve a smoother/flatter response up to 80Hz, or maybe use a "house curve" in which the lower end freq's start higher and gradually decline by about 7-10 dB at the 80HZ. THis being because human hearing at lower freq's require more dB - the House Curve compnasates for that, but some argue that recording studios already factor this, so I'll try both ways and see what I like best . . . . sorry for the long answer, got carried away
