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would buzzing on a receiver apply servo breaks on a subwoofer?

post #1 of 3
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my NAD T751 has a buzz on high volumes. when i crank up my new velodyne ULD 18, it starts popping (i'm assuming it is applying the servo breaks) and sometimes won't turn on for a very long time intermittently. the thing is if i hook up any other sub amp up to the banana plugs, it works fine, even when the servo won't. my question is this because of the servo thinks there's too much distortion from buzzing? at my friends house, he was making the entire house almost fall apart with it before he sold it to me, i can't even make it go 1/5 as loud without it popping and turning off, but my other crappy sub amp can blast it WAY louder and nothing bad happens to the sub.

is this because of the buzzing and the servo thinks the distortion is going nuts and does something? this is out of my expertise, but i really might just get a good rackmount amp which isnt servo based and just use the sub that way if this continues. it's really annoying. other than that, this is the best bass iv'e ever heard.
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Pimprig
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post #2 of 3
First and foremost, obviously check your power, connections, cables and ground. Aside from that, your unit may be having issues.

Anything else is out of my area of expertise...
Edited by 70_Malibu - 12/25/10 at 10:19pm
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The Hairy Beast
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post #3 of 3
Thread Starter 
Quote:
Originally Posted by 70_Malibu View Post
First and foremost, obviously check your power, connections, cables and ground. Aside from that, your unit may be having issues.

Anything else is out of my area of expertise...
obviously i've checked all of that... i even re crimped my RCA cable which is the servo controller cord. ive tried MANY different rca cables as the servo cord. ive tried many different speaker wires for the sub speaker wire. the velodyne amp itself always checks out on paower no matter what. the SERVO FUNCION is what's messing up. do you even know what a servo is? it's an accelerometer that is on the woofer itself that measures and corrects the distortion of the sub while it plays. you can easily distinguish a servo sub by tapping on the woofer while the amp is on vs off. it should sound like a hollow knock and have much more resistance while you tap it if the servo controller (the amp) is on. also if you look at the woofer if you tap it, the woofer will shake on its own, re positioning itself (the servo function). regular subwoofers do not and will not do this, and when the servo function is off, it sounds like a regular sub when you tap it.

seriously i'm not retarded, i KNOW what a servo is, and somewhat how it works, but i have no idea why MY servo right NOW is intermitently popping in and out and not working. the amplification itslef probably works fine. my best educated guess is the fact that my receiver buzzes, and when played on high volumes, it activated the servo breaks (when the woofer is played too hard, the servo detects this and applies servo breaks which basically turns the sub off for a bit, then back on to protect the voice coil) the weird thing is sometimes the sub wont even pop back on after that and i have to turn it upside down, fiddle with it for a long ass time, plug, unplug everything, sometimes it will turn back on, other times i cant get it to work for hours...this last time i decided to use my old sub amp and just connect it to the bana jacks and it worked PERFECTLY while the servo wouldnt, meaning there is NOTHING wrong with my woofer itself and it's either in the servo circuit itself or it's because pre amp signal from the sub out of my NAD T751 receiver carries too much distortion (the buzzing) and the servo thinks that's the woofer going nuts and just turns it off to protect itself anyway. this sub was designed to put out 104db at 20 htz with 0.5% distortion. that's less distortion than nearly any speaker ive ever seen ever. it wouldnt suprose me that the receiver buzzing would apply sevo breaks, but WHY is it so hard to get it to turn back on sometimes? i'm seriously considering either ticking my class b velodyne servo controller into thinking there is no servo circuit and bypassing my servo circuit alltogether, which means theres alot more distortion on my sub, but no problems with the non existing servo, or ill buy a damn good plate amp and just hook that up into the side of my cabinet, OR... i could get a really good plate amp, do that, and also use the servo circuit whenever to have either or, just Y split the voice coil leads to both the terminal plates and the plate amp...


i'm not even expecting REAL help here, but maybe somone can help me... theres only one person i even know of who might even know how to check the servo circuit to see if theres anything wrong with the sub itself to see if its really my NAD thats causing this. i'm betting not even a single OCN member even knows how the servo circuit of a velodyne ULD 18 really works, or how to diagnose one.
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Pimprig
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