Re: Installing a 3-prong attinuator?
Quote:
Originally Posted by
gortnipper
Yes, that makes more sense to me now. Sorry, I can be slow!
The reason I am asking this is because I have been mucking about with a L-pad wired onto (but after) my crossover as both a variable resistor and an L-pad in order to tune the GPA-IIIs horn to the cab/room better. I found that by using it as series-R instead of an L-pad, the sound was slightly better - a bit more "clear" is I guess is how I would characterize it, and I am trying to better understand why.
I might have to try that.
Re: Installing a 3-prong attinuator?
Quote:
Originally Posted by
Old Guy
I just resign myself to some things I won't ever figure out...such as Redheads.
Dude - I am in the same boat. I have my own Redhead as well...
Re: Installing a 3-prong attinuator?
Quote:
Originally Posted by
cradeldorf
I might have to try that.
I just used an alligator clip on the first leg - it makes it real easy to A/B.
Re: Installing a 3-prong attinuator?
If you think your hard at understanding... If you could regale me as to which of the 3 prongs your using I would be most appreciative. Are you leaving out the ground wire then? Which wire goes where? And if done that way shouldn't it be before the crossover?
Re: Installing a 3-prong attinuator?
Lpads have two wirewound resistors in them. As OG said, one is in series with the input, while the other is parallel to ground.
If you use them as rheostats (as shown in the M19 examples above), the two rheostats act differently, so you can get different functions from them if you use pins 1/2 or 2/3. If you use the 1/2 rheostat, the resistance range is 0 - infinity (well, not really, but the min setting is no impedance, and the max setting is infinity - there's a "usable" maximum resistance in there before it goes to infinite resistance, depending on the wire that's in there, but usually around 3x the nominal rating of the LPad if I remember correctly). If you connect to the 2/3 rheostat, it acts quite differently. As OG said, the parallel resistance is reversed. So at the "min" setting, the connection across 2-3, will see the rated resistance value of the LPad (typically 8 ohms). As you crank up the setting, parallel resistance will move towards zero.
So put another way:
PINS - - - MIN - - - MAX
1/2 - - - zero - - - infinity
2/3 - - - 8 ohms - - zero
Re: Installing a 3-prong attinuator?
Quote:
Originally Posted by
Alien_Shore
Lpads have two wirewound resistors in them. As OG said, one is in series with the input, while the other is parallel to ground.
If you use them as rheostats (as shown in the M19 examples above), the two rheostats act differently, so you can get different functions from them if you use pins 1/2 or 2/3. If you use the 1/2 rheostat, the resistance range is 0 - infinity (well, not really, but the min setting is no impedance, and the max setting is infinity - there's a "usable" maximum resistance in there before it goes to infinite resistance, depending on the wire that's in there, but usually around 3x the nominal rating of the LPad if I remember correctly). If you connect to the 2/3 rheostat, it acts quite differently. As OG said, the parallel resistance is reversed. So at the "min" setting, the connection across 2-3, will see the rated resistance value of the LPad (typically 8 ohms). As you crank up the setting, parallel resistance will move towards zero.
So put another way:
PINS - - - MIN - - - MAX
1/2 - - - zero - - - infinity
2/3 - - - 8 ohms - - zero
Okay, I get it now, That was an awesome description. Thanks Mike. :)
Also found this,
http://www.bcae1.com/lpad.htm
Re: Installing a 3-prong attinuator?
Quote:
Originally Posted by
gortnipper
Dude - I am in the same boat. I have my own Redhead as well...
The jury is still out, Redheads are either God's gift to man, or the female half of the race's revenge for everything males have ever done.
Re: Installing a 3-prong attinuator?
Quote:
Originally Posted by
Old Guy
The jury is still out, Redheads are either God's gift to man, or the female half of the race's revenge for everything males have ever done.
It is a paradox that they can be both within nano-seconds of each other...
Re: Installing a 3-prong attinuator?
Quote:
Originally Posted by
cradeldorf
If you think your hard at understanding... If you could regale me as to which of the 3 prongs your using I would be most appreciative. Are you leaving out the ground wire then? Which wire goes where? And if done that way shouldn't it be before the crossover?
I wired mine 2/3 on the positive leg after the xo.
Re: Installing a 3-prong attinuator?
Who knew that a humble L-Pad could spark such a discussion? :Star:
