| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 2387.1 | guarantee'd to save tweeters... | LEDDEV::ROSS | shiver me timbres.... | Mon Jul 09 1990 18:11 | 15 |
|
No problem.
Power up the amp AFTER the rest of the system.
Yes, that means pressing 2 switches instead of one.
Otherwise, you have a job isolating who the culprit is
that doesnt control it's output(s) while power-on transients
occur......
easy.
ron
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| 2387.2 | | JUPITR::BREEN | | Mon Jul 09 1990 19:28 | 7 |
| I do...I do
The 160s have no power switch. They are normaly ON before I power the
amp up. I have tried the other way around with the same result.
next...
|
| 2387.3 | | LEDS::ORSI | Iwillnotdrawpicturesofnakedladiesinclass | Tue Jul 10 1990 16:38 | 12 |
|
Unfortunately, the "pop" or "thump" you hear when powering
up your amps is the power supply capacitors in the amp
charging up. Most amps do this. Some have relays built in
that eliminate the thump by shutting off the outputs until
the supply has stabilized. Although you should observe a
specific power-up sequence, (i.e. amps on last, off first)
it has little to do with the power-up thump or pop.
Neal
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| 2387.4 | just how LOUD is it? | AISG::WARNER | It's only work if they make you do it | Thu Jul 12 1990 16:51 | 7 |
|
Do you worry when you put a loud kick drum through your speakers? If not, don't
worry about the thump, unless it's a lot louder than the kick (which I doubt).
This is the reasoning that Michael Blacker gave me when he set up my recording
studio (UREI 811B speakers); he also put together the upgrade at Blue Jay about
four years ago.
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| 2387.5 | "Hey, EQ that kick into a POWER kick!" | LEDDEV::ROSS | shiver me timbres.... | Fri Jul 13 1990 19:42 | 31 |
|
Im sorry, but you guys just are missing it here. If the amp
is turned on last, all transients have stabilized. Unless your
amp was designed around the time that the Mayflower sailed, or
is capable of less than 10 watts max.....
Ok, we'll go the long route:
Disconnect every input to the power amp. Power on. If thump,
then buy a new amp (fersure) or live with it until you need to
buy replacement speakers...(start saving...)
If not_thump, Connect one new item at a time, but always POWER
*THOSE* up separately......BEFORE powering up the power amp by
it's SEPARATE on/off switch....
The only thing *this* will prove is some obscure ground loop or
loss_of_ground or other Twilight Zone problem. If it's NOT the
amp, then it's someone elses outputs, and if so, turning on the
amp LAST (after everything is stable) will work. period. end of
discussion.
And, for those of you who think a bass drum kick sounds like a
power on transient....back to Physics of Sound 101....sorry.
ron_1200watts_each_switch_throw (I need to get it right, ya know?)
|
| 2387.6 | Time to dust off the Oscope! | JUPITR::BREEN | | Sat Jul 14 1990 15:59 | 17 |
| In my standard power up sequence I DO turn on the amp last. I do it for
the very reasons you mentioned. The problem that I have is ONLY witn
the DBX 163s in the circuit. If I remove (bypass) the 163s I no longer
get the THUMP.(Dr.Dr. it hurts when I go like this)
I think that if I had a better idea of exactly how the 163s work (ie.
schematic/manual) I could troubleshoot the problem. The idea of a
limiter wih one control is a little strange to me and having no
doc. makes it even more strange.
I am starting to think that it is a malfunction in the 163s but the
fact that both sides do it makes less sure. For now I have removed them
from the rack. If anyone can help out with documentation of some sort I
should be able to solve it on my own.
thanx
kpb
|
| 2387.7 | run em on batteries! | LEDDEV::ROSS | shiver me timbres.... | Mon Jul 16 1990 14:25 | 20 |
| Buzzzzarre.
The only thing that I can think of is that when you turn
on the amp, the power supplie(s) in the DBX do something
funny and cause a blip on the outputs....
Possible if you have a 'big' amp....and it's gotta be the
DBX since when you bypass them theres no thump.
Yeah, that sounds good. If the DBX supplies CANT filter
the garbage and line fluctuation the amp load (on turn on)
creates.....yep, that would explain it.
You could beef up the filter caps in the DBXs.....hmmmmm, or
MAYBE a line filter would work (connect the DBXs to it ONLY),
which is 'easier' to try, but more expensive...
ron
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| 2387.8 | sounds like line droop | STROKR::DEHAHN | | Tue Jul 17 1990 17:44 | 17 |
|
Are we talking 160 or 163? The 163 is a less than pro unit and it
wouldn't surprise me if this was normal.
If I remember correctly the 163x has a wall bug power supply. Is this
on the same circuit as the power amp(s)? Do the lights flicker when you
turn the power amp on? It could be that the power amp is sucking so
much startup current that it's causing a voltage drop on that circuit,
enough so that the itsy bitsy power suppkly in the 163x is shutting
down for a few hundred milliseconds, which would be like turning it off
real quick. That would cause a pop.
Try using a different circuit for your power amps than the one for your
board and fx.
CdH
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