I can see that the drivers seem identical except that the b can be crossed lower..500 versus 1200hz ..is it only the use of different dia.that seperates them?
best
Leif
Norway
I can see that the drivers seem identical except that the b can be crossed lower..500 versus 1200hz ..is it only the use of different dia.that seperates them?
best
Leif
Norway
ha-ha
I´ve been through those a couple of times but I cannot see the difference except the frequency and I want to now what makes them perform differently
best
Leif
Info gleaned from Todds' forum :
<>Originally Posted by Steve Burger
thxs
ok so the A sounds better due to the lack of loading cap and centering ring at the price of being more restricted down towards the "upper midrange" and poorer power handling capacity
does anyone have a technical drawing maybe in "exploded view" where I can see the details
I have one of each driver and the 811B horn
maybe I should get another B?
since I planned to potensially run it with 515ghp in 416a´s , 1200 hz x/o seem slightly too high?
best
Leif
- More info from Jim D , ( gleaned from Todds' place )
- Original (OLD) thread is located here !
Originally Posted by Jim D- This seems to be the commonly held POV ( group wisdom ) though I've never seen any response studies to support this view-point .Originally Posted by Leif
- I've never seen an "exploded view" published, for the 902 .Does anyone have a technical drawing maybe in "exploded view" where I can see the details
- Many people consider 1200 hz the correct crossover point for the 902/811 combo ( regardless of the 902-8x suffix ) .I have one of each driver and the 811B horn, maybe I should get another B?
Since I planned to potensially run it with 515ghp in 416a´s , 1200 hz x/o seem slightly too high?
<>
ps ; Here's the exploded view for the 808-8B driver . I've pointed to the centering ring within it's construction .
- Another possible difference between the two models is the number of radial slits in the tangerine phase plug .Originally Posted by Leif
- My pair of 902-8B have an eleven slit phase plug ( like the later 909-8a model ) whereas the Altec literature for the 908-8a & (early ??) 902-8B stipulate 13 slits should be present in the phase plug . Maybe the original 902-8a phase plug has 13 radial slits .
<>
Fantastic thxs
from junior member to senior member
best
Leif
hello again
after setting up an excel spreadsheet with a matrix of my different 1 inch HF drivers and checking all available pdf´s, I start to get the picture:
If I take out the loading cap and adds felt in the back chamber of the 902-8B it essentially becomes a 902-8A with respect to powerhandling,efficiency and frequency respons, OR ?
best
Leif
Norway
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