Hi,
May I know whether the N7000/N8000 XOs are meant for:
1. 16 ohm mid, 8 ohm high OR
2. 8 ohm mid, 8 ohm high OR
3. 16 ohm mid, 16 ohm high
Thanks.
Hi,
May I know whether the N7000/N8000 XOs are meant for:
1. 16 ohm mid, 8 ohm high OR
2. 8 ohm mid, 8 ohm high OR
3. 16 ohm mid, 16 ohm high
Thanks.
It's been a long time since I've used them but my recollection is that these were sold for the JBL home components for crossing over to the 077 tweeter (this is how I used my N8000's). The home components were typically nominal 8ohm speakers.
The mids are 16 and the UHFs are 8.
Everything is nominal.
If you "Search," you'll find what they actually are....
According to this sites catalog images for 1976 home components found here :
http://www.lansingheritage.org/image...comp/page7.jpg
both Zilch and I are correct.
Apperently, in '76 at least, the N7000 was designed to cross from the 375, 16ohm mid driver to the 8ohm 075 or 077 but the N8000 crossed from the LE175 or LE85 mid drivers which were both 8ohm. In both crossovers the input impedance is listed as 8ohm. I didn't look at some of the other years catalogs since this was the one I remembered having.
equations :
LE85 mid : 8ohms = 16ohms
+
home component (consumer/black paint) = pro (grey paint)
3105 = N7000
3106 = N8000
if i well remember ...
solution ?
make a search on this forum there are some posts regarding Xover frequency responses vs impedance load
Originally Posted by Giskard/4313b
- Here's a raw "Z" plot from one of Zilch(s)' le85s ( not mounted to a horn ) .
Originally Posted by Zilch
- 10 ohms , across most of the bandwidth looks correct for a lowpass filter / OTOH / in the area where this driver is most likely going to be highpassed ( & with those impedance peaks shifted lower by an attached horn load ) , one could easily choose 20 to 30 ohms ( or less of course ) .
ps 1 : here's an example of the AC impedance ( spikes ) shifting downwards, caused by the loading of the attached horn ;
ps 2 : similar Z plot ( but different enough to warrant the post ) of a 2426J on H3100 ( ignore the 2226j label )
ps 3 :
Originally Posted by Mr. Widget ( mostly )
ps 4 :
- Here are Giskards' voltage drives for both crossovers mentioned ( N7000 & N8000 ) .
- The comparitive V-drives were obtained using different dummy loads ( 8 or 16 ohms ).
- One can extrapolate for themselves what twin, 10 ohm loads would look like ( or for that matter , a mix of different impedance loads ) .
Thanks guys.
Are the internal parts of the N7000 replaceable? Are there replacement parts readily available to freshen up the old cross over?
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