Woofer goes lower than subwoofer?
Sumflow
Posts: 64
I have a pair of Cerwin Vega RE Series 30 speakers, showing a frequency response of 28-20k with the crossover at 500 hz, 6khz. Everything is going to overlap. Frequency Response on the Polks is 32-250 Hz. What is the theory for setting the low pass when your woofer has more range than your subwoofer?
"At the first bend, I had the clear sensation that Tazio had taken it badly and that we would end up in the ditch; I felt myself stiffen as I waited for the crunch. Instead, we found ourselves on the next straight with the car in a perfect position. I looked at him, his rugged face was calm, just as it always was, and certainly not the face of someone who had just escaped a hair-raising spin. I had the same sensation at the second bend. By the fourth or fifth bend I began to understand; in the meantime, I had noticed that through the entire bend Tazio did not lift his foot from the accelerator, and that, in fact, it was flat on the floor. As bend followed bend, I discovered his secret. Nuvolari entered the bend somewhat earlier than my driver's instinct would have told me to. But he went into the bend in an unusual way: with one movement he aimed the nose of the car at the inside edge, just where the curve itself started. His foot was flat down, and he had obviously changed down to the right gear before going through this fearsome rigmarole. In this way he put the car into a four-wheel drift, making the most of the thrust of the centrifugal force and keeping it on the road with the traction of the driving wheels. Throughout the bend the car shaved the inside edge, and when the bend turned into the straight the car was in the normal position for accelerating down it, with no need for any corrections."
Enzo Ferrari
Enzo Ferrari
Post edited by Sumflow on
Comments
-
Hello,
It's not unusual for speaker manufacturers to be very kind to themselves when they publish their frequency response numbers. I would take that "28Hz" with a bit of salt (maybe the complete saltshaker). In all likelihood the useful low frequency response is more in the 60Hz neighborhood or even higher. Here again pick a frequency, say 80Hz, on the sub go a bit higher and listen, then set it lower and listen. Without some kind of frequency response measurement capability you'll need to do some listening to get everything blended.
Enjoy, Ken -
I don't know Ken. CVs can probably pound to 40 hz and maybe a bit below, after all that's what they're famous for. They have a fairly large cabinet, massive woofers and...? That said, the sub probably does go "lower"!
I bet the 15" Vegas can hit a legitimate 30hz tone? Or as Eddie Murphy might sing: Party all the time, Paaarty all the time..!
cnhCurrently orbiting Bowie's Blackstar.!
Polk Lsi-7s, Def Tech 8" sub, HK 3490, HK HD 990 (CDP/DAC), AKG Q701s
[sig. changed on a monthly basis as I rotate in and out of my stash] -
The problem is that just looking at a single number without giving the range of deviation isn't very helpful. Is "28Hz" at -3dB? or, -6dB? or -12dB? Where does the bass begin to roll off? If you're trying to match other equipment to it you need to know how the frequency response reduces after the system resonance.
-
Ditto on Ken's words, also your in room response will be different than published specs as every room is different, obviously. You may be looking for a cut and dry answer, but there isn't one. Start at 80 on the crossover as Ken suggests and adjust up or down to your liking.HT SYSTEM-
Sony 850c 4k
Pioneer elite vhx 21
Sony 4k BRP
SVS SB-2000
Polk Sig. 20's
Polk FX500 surrounds
Cables-
Acoustic zen Satori speaker cables
Acoustic zen Matrix 2 IC's
Wireworld eclipse 7 ic's
Audio metallurgy ga-o digital cable
Kitchen
Sonos zp90
Grant Fidelity tube dac
B&k 1420
lsi 9's -
I can't offer any sub advice but, I love your signature/paragraph/quote !!
-
Many OEM's love to add in room gain to their LF rating. And as Ken said, who knows if it's the -3, -10, etc..."He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
-
Oh you mean about the origin of the four wheel drift. I found that a few years back and I was looking for a place to save it. The Polk window was open so I stashed it in here. Glad you liked it. My brother thought maybe my Dad had written it after a ride with me. I am not really sure I can shorten it.I love your signature/paragraph/quote !!"At the first bend, I had the clear sensation that Tazio had taken it badly and that we would end up in the ditch; I felt myself stiffen as I waited for the crunch. Instead, we found ourselves on the next straight with the car in a perfect position. I looked at him, his rugged face was calm, just as it always was, and certainly not the face of someone who had just escaped a hair-raising spin. I had the same sensation at the second bend. By the fourth or fifth bend I began to understand; in the meantime, I had noticed that through the entire bend Tazio did not lift his foot from the accelerator, and that, in fact, it was flat on the floor. As bend followed bend, I discovered his secret. Nuvolari entered the bend somewhat earlier than my driver's instinct would have told me to. But he went into the bend in an unusual way: with one movement he aimed the nose of the car at the inside edge, just where the curve itself started. His foot was flat down, and he had obviously changed down to the right gear before going through this fearsome rigmarole. In this way he put the car into a four-wheel drift, making the most of the thrust of the centrifugal force and keeping it on the road with the traction of the driving wheels. Throughout the bend the car shaved the inside edge, and when the bend turned into the straight the car was in the normal position for accelerating down it, with no need for any corrections."
Enzo Ferrari
![[Deleted User]](https://w8.vanillicon.com/83b82048d67877ca27bbc25d5d38f9d3_100.png)
