my sub's is making weird noises

[baconmaster]

i have had the velodyne dsp-12 for about 2 weeks. it sounded great at first but now i am noticing a problem. i had just cranked it the day before as loud as it/my ears could handle. the next day i was noticing that it doesnt sound as good, it seems to be playing more voice and higher notes even when the crossover is set to 70. it almost sounds muffled and as if it is being pushed too hard even on low volume. is it blown?, or partly blown if there's such a thing? whats going on?

 

[annunaki]

I would suggest taking it in to your dealer if you feel there may be a problem.

How long were you listening at high volume? Did anything happen while listening?

 

[mulester7]

.....and how's that SVS offering you received from Ohio, Annunaki?.....I tell ya' what, I believe in them boys at SVS....they'll tell you what you need, and you'll stand in awe of what their stuff does.....guys, these PB12/4's have poopin' holes that are about 15 tall and 18 wide on one side....(openings, almost square....15 tall by 18 across)....this is where the oscillations are sawed out.....rated 128 db of spl at 16 hz using two subs, fully powered ....136 db at 25 with no port tuning using two subs fully powered....and the top of the frequency-range of the B12/4's not being restricted by port plugs is what you love with music.....so only plug on home theater, imo....but, I don't plug at all, considering I get about 10 hz range of under-35-non-pitch-audibility, for "realism concussion", when I "don't" plug, and change the tuning of the box away from the 25hz it is optimally tuned unto....and remember this....imo, haha.....but through experience....when you plug ports on a sub, the oscillations rendered "cannot" be as clean with the range-tuning of the box being changed....and, you'll lose the top....but, it's your money, plug every hole you see on that sub if'n you choose....mercy, 136 db, that would be actually punishing....people at my house start lookin' different after about 10 minutes of reference levels plus, haha.....

.....Buck wisely uses weight to rate receivers....I have my own test on front-firing subs...."The Bic Lighter Test", invented by mulester7, and magazinally-endorsed in 1986 and 2001, by an excited and worshipping Richard Pierce, haha....maybe not....keeping it short, one of these front-firing PB12/4's can snuff a Bic at just under five feet, bend the flame up to 12-14 feet, and the flame at least twitches anywhere in the room....and I'm nowhere near using 2500 watts "continuous".....well, I have made that yellow light of going into headroom on the K2 flicker "on" a couple of times, haha.....

 

[annunaki]

Mulester7,

My sub is working great! It is too bad I do not enjoy it enough, as I am upgrading the rest of my system. Right now I am only in 2.1 mode . I can't imagine what my wife would say if I brought the behemoth you own home.

In best interest of this thread, you should have PM' ed me. I do not want to hi-jack this person's thread.


I do love it when my walls shake though!

 

[mulester7]

Headroom

An amplifier’s ability to go "beyond" its rated average power ("RMS or continuous power") for a short time in order to recreate loud or explosive audio signals that rise very quickly. In order to have high headroom (an ability to achieve loud peak levels without distorting), and amplifier must have a solid power supply with a good amount of reserve energy on which it can call.

Headroom, also referred to as dynamic headroom, is measured in decibels (dB). An amplifier with a rating of 3 dB can double its output power for peaks. So, if an amp were rated at 100 watts RMS (continuous) power, its peak power rating would be 200 watts with a headroom of 3dB. If the headroom were increased by another 3dB, there would be another doubling of peak power (to 400 watts in this example) and your db's of headroom would be 6 db over the continuous-RMS rating of 100 watts of the amplifier.

Note that amplifiers with high headroom numbers are not necessarily better. In fact, most quality, high-end amps have headroom numbers of 3dB or lower. This is because those quality amplifiers have robust power supplies that can react to transients and sudden power demands "quickly" within their continuous power envelope. The best amplifiers may have very low headroom figures of say 1dB or even less. Conversely, beware of amplifiers with very high headroom ratings, say 6dB. Such amps most likely use poor power supplies that are only able to provide higher output levels for short periods of time.

 

[annunaki]

Mulester7,

I am guessing the reason you have that beast is for... headroom.

 

[mulester7]

Mulester7,

I am guessing the reason you have that beast is for... headroom.

.....Annunaki, all I know is, I got an email asking me if I wanted two of those for the price of one in "piano black" that honestly has some mirror to it....I stared at the screen for 10 minutes figuring assets present and immediate.....

.....I thought you most ably answered the thread initiator so I felt I'd holler at you above ground....where we all should be really....let's loosen up, guys, we're among friends....let's just get a cup of coffee, sit down, and talk to each other....Jaxvon, I love to see your posts show up....great posts are falling everywhere, in all the forums.....

 

[Sheep]

Mule,

Do you have a digital camera? I REALLY wanna see your setup
I love having my system in my room, everything can be as big as I want, but I can't afford it.


Once this job thing gets rolling, the stereo will see a new sub, and possibly TV.

Sheep

 

[mulester7]

Mule, do you have a digital camera? I REALLY wanna see your setup Sheep

.....Sheep, I don't know how I missed this one, sorry....I don't have a digital camera, and still lean to and take, a lot of film snaps at night off a tripod using both daylight and tungsten films....one of these days I'm going to ask a friend to take some snaps in my theater with a digital, but don't expect that much....after the divorce and moving back in this house, I occupy the basement which was used for storage at the time....it still looks like storage space, but I have hollowed out part of it to be my entertainment area with computer station and theater....I don't have a beautiful room like others have, but I feel at home and comfortable spending a lot of time here....The Duffinator, I still remember how pretty your listening room is....you too, Buck.......

 

[Sheep]

.....Sheep, I don't know how I missed this one, sorry....I don't have a digital camera, and still lean to and take, a lot of film snaps at night off a tripod using both daylight and tungsten films....one of these days I'm going to ask a friend to take some snaps in my theater with a digital, but don't expect that much....after the divorce and moving back in this house, I occupy the basement which was used for storage at the time....it still looks like storage space, but I have hollowed out part of it to be my entertainment area with computer station and theater....I don't have a beautiful room like others have, but I feel at home and comfortable spending a lot of time here....The Duffinator, I still remember how pretty your listening room is....you too, Buck.......

Not a problem my friend, no rush. Give me a PM when you get around to it. As for ugly rooms, Mine takes the cake. Plaster "square" designs on plaster board walls, stained concret floor, and black fiberbaord with brown hightlights for half boards and one wall......ughhh.


Sheep