dpp00
Joined: 23/03/08
Posts: 6
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clipping
#604006 - 15/04/08 03:28 AM
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hi
my first post ever on anything,
ive been using 2 300w speakers with my mackie
powerd mixer
for a few years now with no problems,
but i recently bought the
macthing subs,now i dont ever do big venues so ive been
bringing a top and a sub and
alldo theres a wonderful improvment in sound my amp seems to be clipping/or sometimes my
speakers make like a frap sound,
sorry if im droneing on.anyway would i be right in
thinking that my amp is now under powerd for the job.specs below
keyboard/and
vocals
2 300w peavey impulse tops
2 400w peavey impulse subs(I THINK COULD BE
500W)
1 mackie 808s powerd mixer(300w into 8ohms/600w into 4ohms)
thanks very much in advance
dave
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Sheriton
Joined: 27/01/03
Posts: 1554
Loc: Leicester, UK
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Re: clipping
[Re: dpp00]
#604031 - 15/04/08 08:28 AM
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Can you post what the impedances are of your cabs? The tops are likely to be 8 ohms but
the subs could be 4 or 8. If they're 8, then yes, the amp is a little underpowered but as
long as you don't push it in to clipping, you shouldn't have any problems.
If the
subs are 4 ohms, then you're presenting an impedance of 2.7 ohms which is probably too low
for your amp to cope with, hence the problems.
--------------------
There's nothing we can't face... Except for bunnies
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James Perrett
Joined: 10/09/01
Posts: 9653
Loc: The wilds of Hampshire
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Re: clipping
[Re: Sheriton]
#604039 - 15/04/08 08:43 AM
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Quote Sheriton:
If the
subs are 4 ohms, then you're presenting an impedance of 2.7 ohms which is probably too low
for your amp to cope with, hence the problems.
Don't the subs have crossovers? They really ought to.
With a properly designed system using crossovers the impedance shouldn't go below 4
ohms. This is still placing a greater demand on your amp and will probably cause the power
supplies to sag a little which will mean that the amp clips at a slightly lower output
voltage.
Cheers
James.
--------------------
JRP Music - Audio Mastering and Restoration.
http://www.jrpmusic.net
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dpp00
Joined: 23/03/08
Posts: 6
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Re: clipping
[Re: dpp00]
#604238 - 15/04/08 04:34 PM
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hi
thanks so much for the quick replys
yes the tops are 8ohms
the subs 4ohms,
as i mailed ive only been useing one of each for gigs connecting the
top to the amp then the top to the sub there is three inputs on the sub two filterd one
jack one speakthon / one unfilterd jack,
ive been useing the filterd speakthon
which says 150hz,
i seem to get a better result by switching the amp from stero to
mono but the problem is i lose my vocal reverb in mono.would a proper seperate crossover
help they dont seem
that expencesive (my spelling is awrful sorry)
thanks
again
dave
Edited by dpp00 (15/04/08 04:41 PM)
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Sheriton
Joined: 27/01/03
Posts: 1554
Loc: Leicester, UK
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Re: clipping
[Re: dpp00]
#604358 - 15/04/08 08:55 PM
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Quote dpp00:
would a proper
separate crossover help they dont seem that expensive
In some circumstances it would certainly help but for you it
would be a little tricky. "Proper" crossovers operate at line level rather than speaker
level; using one with a powered desk like yours would require that you (a) be able to
insert it at the appropriate point in the signal chain between mixer output and amp input,
and (b) procure a second power amp to drive whichever cabs the desk isn't powering.
--------------------
There's nothing we can't face... Except for bunnies
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dpp00
Joined: 23/03/08
Posts: 6
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Re: clipping
[Re: dpp00]
#604537 - 16/04/08 10:06 AM
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well anything that dips into the world of tricky should be
avoided like
benifit gigs,
would a power amp help say about 1000w a side,
if i slaved
it into my mackie would that produce enough power,
because at some stage i,m
goin to have to use all four speakers for a wedding or party so i might as well be prepard
now,
thanks again
dave.
and thanks to everybody who takes the
time to answer on these fourums ive picked up lots of very useful info since i found
them,and i like the way nobodys condesending to those of us who are not so well up on the
tech side of things, cheers
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Roidster
Joined: 14/04/08
Posts: 5
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Re: clipping
[Re: dpp00]
#604995 - 17/04/08 05:08 AM
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easiest thing i would say is
buy an amp for your subs
use the line out on your
mixer for the sub amp
and use the speaker out for the tops
--------------------
Just a Musician
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