Easy to do.Originally Posted by Ian Mackenzie
It's fine for certain loads as shown by the voltage drives. Anyone can change the values as required/desired to get the performance they desire.Originally Posted by Ian Mackenzie
Easy to do.Originally Posted by Ian Mackenzie
It's fine for certain loads as shown by the voltage drives. Anyone can change the values as required/desired to get the performance they desire.Originally Posted by Ian Mackenzie
To assist with some clarity here I will arrange the new equivalent schematic and run some voltage drive tests using the std JBL test jig over the next day or so.
Those curves from GT's file look almost identical to the readings on Db scale of my analogue meter...by the way.
Good.
I must have done something right then.
Thanks.
Originally Posted by Giskard
First thanks very lot Giskard for this precious information and I'm feeling you put a finger touch on good aspect...
I talk with my brother and the 2405 is originally 12 ohms impedance and substitution by final 16 ohms... is look same story for the original 2420...
actually I have changed recently the 2405 for new original 16 ohms
and the sceal of 2420 is not here. so maybe ???
----------
I keep a moment for understand this excellent flood information...
But I feeling, in regards on your information, the best it is mesure the real impedance of each driver...
Thanks again...
===================
Ian,
first thanks for reply,
You trouble my head
maybe my slab rock is contains a iron and create a induction !!! I no idea what test good for verified this aspect... do you IDEA ???
(of course the simple probe tester in ohms is create 0 value....)
I have a slab and inductor of second network not mounted so maybe it is possible to perform test but I dont know the protocol....
Jean.
There is no such thing as a 16 ohm 2405!!!! How many times.....? Here are the impedance plots again.
http://www.audioheritage.org/vbullet...4&postcount=10
For the record, the red plot which has the lowest impedance was an original 2405 with 16 ohms proudly printed on it's undisturbed foilcal.
Widget
SOP if one is as serious as you appear to be.Originally Posted by B&KMan
No there isn't! Not even close!Originally Posted by Mr. Widget
That would appear to be SOP.Originally Posted by Mr. Widget
Anyway, it had to happen sooner or later.
Someone was bound to start testing a bunch of these legacy drivers and discover the truth.
At least now you all know why some folks hand pick their components and carefully match them. Westlake comes to mind...
I wonder if this will start a flood of forumites getting all their drivers measured.
You're welcome. I'm outta here. I hope these posts were of help.Originally Posted by B&KMan
.
Reposition the inductors at least three inches and measure gain.Originally Posted by B&KMan
Jean,
Have you verified with a meter (with a db voltage scale) with the filters connected on the 8 ohm load resisters the attentuation as per JBL spec sheets on the 3145 crossover?
This will help you determine where the fault is.
Originally Posted by Mr. Widget
Thanks Mr Widget,
Do you have perform correlation into impedance curve and spl ???
According in basic principe the 8 ohms is play (in theory) 2 more loud than 16 ohms... Right ?? so the 16 to 10 ohms is contain potentially big difference ouput power... right ???
Jean.
Hi everybody,
I keep just 2 minutes in rush time for give a late news...
actually audio system is open 24H of the 24H, left speakers or old network and right is new Network...
After 1 week, the sound is change... yesterday surprise the speaker right is rebird with phenix...
Yesterday the bignet is pass the first step rodage... the sound is less squeese sound, more deep and wide...
I no time now but I very curious to check mesure again...
I'll be back !!!
Yes, if such actual impedances existed in 2405's, which they don't, no matter what it says on the foilcal label, which is the point here....Originally Posted by B&KMan
Originally Posted by B&KMan
Another 2 minutes for expose sound effect result in ....step 2..
Now the right speaker with bigNet is play clearly higher than old network on left speaker.... little more wide and fast but (here is come baby) the sound is metal harsch... because I'm not familiar with the russian mountain burning in this set-up but, I'm refer to burning of modification on 2143 in first post in this thread:
The metal harsch is long phase before final great opening sound and down signature...
actually I listenning more 50% details before modifications....
actually the sound is look same as first modification with film and foil Solen really improvement but a touch of metal on all aspect... this effect is completly dissapear after 5-6 week with system on 24H/24H...
I have no idea if the Dc charge is slow or not the time burning...
So the triller continue...
(p.s. I try to mesure entire speaker this week-end ( big time consuming))
Jean.
In all of this, I have not yet figured out what "rodage" or "cie" mean.
Anybody have a clue?
Originally Posted by Zilch
sorry poor english => rodage = burning
=> cie = company
Jean
I have a long weekend so I should be able to key the system into absolute focus with the Hi end external crossover and Hi end active crossover.
Pictures to follow.
Here is the IN/OUT department.
The Cardas Bindings posts provide input from the large Spades. One Binding Post pair provides termination of the bass bi amped signal which is routed directly to the Output via the Heavy duty 8 Pole Speakon. The other Binding post pair handles the Mid/High biamped signal which is routed via the 3 passive crossover filters. The Speakon connector provide a convenient and effective means of routing 4 conductor pairs directly to the drivers while maintaining fail safe phasing of the discrete signals.
Earlier in the week I burnt my fingers solding the Cardas binding posts, they are an excellent conductor of heat!
The Doctor
WOW.
Okay,
Sometimes there are no words to describe what you hear, this is one of those moments.
What I can say is there appears to be a certain order about what is heard.
There is also the most believable life like expanse of sound such that you are projected to the venue of the recording.
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