Posted by El Pájaro on December 28, 2000 at 07:18:17:
In Reply to: Peak and Limit LED's posted by Jah Rude on December 27, 2000 at 11:04:31:
: I have an Ampeg B2 stack which has the power amp built into a cabinet
: with 4 eight inch speakers and that sits on top of 1 fifteen inch speaker.
: On the back of the power amp, it has a label indicating 200watts @ 8 ohms
: (which is also labeled on the 15 cabinet), 350watts @ 4 ohms and then 4 ohms
: minimum. So, I'm not sure how many total watts I have according to
: these labels not to mention my limit and peak led's go off if I turn it
: up half way but I have to turn it up cuz it's hard for me to hear myself
: over everything (keys and drums especially). I would really appreciate it
: if someone could help me figure out how many watts I have and how much
: attention should I pay to those led's.
How much power is your amp delivering? It depends on the impedance of the speakers! What's your amp like? IS it a combo amp with the head and speakers all integrated into one single unit? If so, check the back pannel to see if the amp accepts an external speaker. That being the case, then your amp's speakers are more likely configurated to an 8 ohm load, thus your amp should be delivering 200 watts. In that scenario, if you add an extension cabinet with an impedance of 8 ohm, you'll be running your system at 4 ohm (I know it doesn't sound too logical, but trust me on this one), thus extracting all the usable juice from the power amp.
If your amp is not what I'm assuming, speak up, and I'll give a different advice. However, if you have any spare time, check the manufacturer's website or email them so they tell you what's the impedance load of your system AS IT IS.
Regardingo those LEDs: it depends on what are they desgined to indicate. If the LED indicates peaks at the preamp stage, be careful: too much LED blinking may mean your overdriving the preamp stage (not good!), so you should set the preamp level where the LED doesn't blink (or blinks ocassionally).
Hope some of this helped. Buena suerte and keep that bass up front in the mix,
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