16 ohms, more or less. Tho the L-Pad in the crossover is likely to make the top end closer to 8 than 16.
Are you asking this for use with a tube amp?
If I have a:
416A 16 ohm low frequency
806A 16 ohm driver high frequency
N-800-G crossover
What is the impedence of the speaker????
16 ohms, more or less. Tho the L-Pad in the crossover is likely to make the top end closer to 8 than 16.
Are you asking this for use with a tube amp?
The L pads used here will see that the amp will see 16 ohms as the load. The actual load, that is, the HF driver, may not see the source as 16 ohms, which is slightly less significant, tho significant. This is b'coz it is not a T pad.Originally Posted by Panomaniac
L pads take care of only one side, depending on the orientation, whereas T pads do it both the ways.....
Am I right ?
Yeah, pretty much. I used L-Pad as a generic term for the volume control. I suppose that it may be a T-Pad.
They don't stay as constant as one might hope, they vary over the range. If it's important I can run an impedance sweep of 16 ohm 806 driver with the N-500 crossover.
The low pass section will still be whatever the woofer impedance is, at least below the crossover point. The crossover point will shift, however, if a different impedance is used.
EDIT: Come to think of it, more than shifting, the crossover will peak a lot at the crossover point if the wrong impedance drivers are used. I doubt this will sound very good. :-/
The L pad is not comparable to a standard volume control, though it does control it.
The volume control depends on non-interfering source and loading impedances. It never takes care of the resultant figures.
In the case of a volume control, a slider is moving between a constant value of a resistance.
In the case of L pads, there are two things changing in value at the same time in order to make one thing constant.
In the case of the T pads, three things change in value at the same time in order to keep two things constant.....!
Well, you can read the advertising copy but have you ever tested?
They are not as good as claimed. BTW most here don't need oversimplified explanations we are fully are of the difference.
But in real life things are not as accurate or simple as you say.
Your neighbors called. They like your music.
it will make your horn real sound hot..about twice as loud as it should be.
"those sounds to which no definite pitch can be assigned are usually classified as noise"<br />harvey fletcher-1928
Hi....
Sorry for sounding offensive.....
What I meant to say was that attenuaters or pads etc. do not change in value thru sweeps due to the absence of any reactive components. But impedance changes in drivers thru f sweeps are always there. A well made switchable type L/T pad can remain at the calculated value very much. Isn't it ? Or I am being dumb somewhere ?
Aditya
I am asking because I was just curious. It got to technical for me as I am a novice. I have no idea what a L-Pad is. I guess the answer to the original ? is 16 ohms?
No offense taken.Hi....
Sorry for sounding offensive.....
What I meant to say was that attenuaters or pads etc. do not change in value thru sweeps due to the absence of any reactive components. A well made switchable type L/T pad can remain at the calculated value very much. Isn't it ? Or I am being dumb somewhere ?
Aditya
Just that it isn't that simple. In real life there is no such thing as absence of reactive components. Reactance can be reduced but never eliminated. The goal is to reduce it to a usable level.:coffeedrinker:
Second- first you mention "sweeps" then "switched".
Which are we discussing?
Resistive components are never exact. Hand selecting components will help but is rarely done except by us crazy audio geeks.
Variable resistors don't track perfectly. As such yes there will be variations during the sweep.
Fixed resistors in a switched unit can be much more accurate, but you can NOT isolate the L Pad. It is part of a circuit with the driver. As such it WILL show variations in impedance to the crossover.
You can't just go by a formula and predict results with 100% accuracy. You must test.
While a properly designed L Pad will present a flatter curve to the crossover than most drivers, it is NOT perfectly flat. The crossover will still see an impedance curve regardless.
This is called SYSTEM design. All components have to be taken into account and often compromises made in some parts to allow for oddities of others.:doh:
The most successful finished designs are the ones that manage these compromises best.
Your neighbors called. They like your music.
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