What happens if the current suddenly goes to zero - say you open a switch between the amp and the speaker?
I’m not sure i’ll be using correct terminology so bear with me!
when the zobel network is used between the xo and tweeter does it change the speaker impedance the HP ‘sees’ as in measured tweeter impedance is 3.9ohm and when the 6r/0.47uf zobel was in place is the HP circuit now calculated @ 6ohm?
I was getting some screwy fr with the 6r and changed it to 4r (closest I had to 3.9)and things are much happier.......so basically should the zobel match measured driver impedance?
And on topic i’m thinking joes setup will only work as a system designed to be played together and never seperated? Much like I tune my stuff to the lp?
when the zobel network is used between the xo and tweeter does it change the speaker impedance the HP ‘sees’ as in measured tweeter impedance is 3.9ohm and when the 6r/0.47uf zobel was in place is the HP circuit now calculated @ 6ohm?
I was getting some screwy fr with the 6r and changed it to 4r (closest I had to 3.9)and things are much happier.......so basically should the zobel match measured driver impedance?
And on topic i’m thinking joes setup will only work as a system designed to be played together and never seperated? Much like I tune my stuff to the lp?
The HPF is seeing a rising impedance load due to tweeter VC inductance.....the zobel network flattens the tweeter apparent load to 3.9R regardless of frequency.
Yes,the zobel network resistor should match the DC resistance of the driver (tweeter).
The aim of Joe's setup is that the speaker does not change according to amp/cable resistance, on the flipside changes in amp freq response and cable reactance will become more audible as you have discovered.
Thanks Dan, I suppose my impedance matching must be fairly close for a zobel not to work in front of the xo ?
For all this to happen on the fly in joes amp it’s gonna need some serious dsp because this doesn’t sound like it’s possible any other way?
At the moment it's talking about zobel networks, what are you talking about?
Well, the current isn't reactive because in a current drive amp the current is the controlled quantity (by feedback), but the voltage is, determined by the reactive load. The output stage sees the same reactive load conditions with the same current to voltage relationships (relevant for crossover-distortion and thermal behaviour, operating points etc) as it does under voltage drive -- assumed that both are eq'd to the same SPL transfer target. We just switch the controlled quantity. To first order and beyond the output is identical as long as we stay inside the driver's dominantly linear range, and load conditions for the amp also don't change.
It seems being called a charlatan is not aggressive... pull the other leg.
You tell me. It seems obvious to me, so I am not sure what you are getting at? I am assuming the current here is from a current source, right?
Are you saying that there is something stored? Please be more precise.
You tell me. It seems obvious to me, so I am not sure what you are getting at? I am assuming the current here is from a current source, right?
Are you saying that there is something stored? Please be more precise.
Boucherot cell it is
But I got there talking about joes amp......kindly relative!
You've not come across them before in crossovers or on the output of amplifiers?Boucherot cell it is
But I got there talking about joes amp......kindly relative!
I knew what it was but never experimented with it till now......I think I’ve got the r correct but need a little less c , I thinks it’s limiting my ‘air’ a touch.....gonna order up a 0.33uf and try that instead of the 0.47uf. Probably will get the next one down also.
On the tweet it seems to help focus and straighten the polars out from the new 2 tweet per baffle setup.
On the tweet it seems to help focus and straighten the polars out from the new 2 tweet per baffle setup.
I will repeat what I said.
""Do not confuse detailing why your explanations are incorrect.... with aggressiveness.""
I have not called you anything like that. I would hope you can limit your aggressive responses to those who deserve such.
It does not matter how an inductor is driven. If there is current, there is stored energy.
Inductance, by definition, is the relationship between the current within a system, and the magnetic field stored energy within that system.
jn
I use zobels to match a t-line when the load is insufficient to prevent reflections.
Your use after the crossover, across the tweeter, seems like it's just a means of tailoring the sound to your liking. As such, I think you may be better off just playing with values until you are happy.
jn
This discussion has its pointless aspects by now, sort of like when does a piece of zip cord stop being a t-line.
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