oldbrowndog
06-23-2014, 12:55 AM
HI All, Im located in australia where we cant just hoover up Altec parts at garage sales so im doing a build fro scratch with parts i had to ship in from the states.. So it better be good!
Thanks in advance for all information i hope you provide..
So.. I am at the beginning of a build of some A7 cabinets to house the following Altec components
416 -16z speakers
806a compression driver
811B horns
Custom built N-800F crossovers (not yet made)
I am using the enclosure build plans listed in the bottom left corner at this link:
http://www.lansingheritage.org/html/altec/plans/1968-plans.htm
I am very interested to know 2 things..
1. How to achieve low frequencies (30hz) with the 416-16z in the cabinet.
2. Whether to add a bullet tweeter to the design for highs.
LOW FREQUENCIES
As i understand it with some modifications to the crossover & some to the size of the port it is possible to get 30hz frequencies out of the A7..
Can someone please explain what these modifications & any other necessary ones might be?
BULLET TWEETER
I had planned to have some N-800F schematic based crossovers built by a local speaker guru to suit the 16 ohm setup of woofer & tweeter..
My query is regarding the possible addition of a bullet tweeter to the A7 design to cover those really high sibilant frequencies & leave the 811 horn for the mids & highmids.. This would obviously require a different crossover design & a place to locate the tweeter physically so I ask:
a) how might the addition of a bullet tweeter (from a similar era) affect the overall efficiency of the design? Efficiency is paramount for me as i plan to use a valve amp to drive these babies.
b) which bullet tweeter might best suit the components I already have, I assume it also needs to be 16ohm to suit those components..?
Perhaps a pair of these JBL 075 16 ohm bullet tweeter?
c) Please see one of the attached sketched image for my idea as to where to place the bullet tweeter.. I think as close to the top centre of the 811 horn as possible is important? & I will not attach it to the top of the box until i have aligned it with the woofer & horn below..
d) is it a good idea to add the bullet, or do i not need to do it..? Id prefer to plan for it in advance rather than have to build a separate crossover later to add a bullet tweeter if i don’t do it in the beginning..
Thanks again happy to be on the journey..
62485
Thanks in advance for all information i hope you provide..
So.. I am at the beginning of a build of some A7 cabinets to house the following Altec components
416 -16z speakers
806a compression driver
811B horns
Custom built N-800F crossovers (not yet made)
I am using the enclosure build plans listed in the bottom left corner at this link:
http://www.lansingheritage.org/html/altec/plans/1968-plans.htm
I am very interested to know 2 things..
1. How to achieve low frequencies (30hz) with the 416-16z in the cabinet.
2. Whether to add a bullet tweeter to the design for highs.
LOW FREQUENCIES
As i understand it with some modifications to the crossover & some to the size of the port it is possible to get 30hz frequencies out of the A7..
Can someone please explain what these modifications & any other necessary ones might be?
BULLET TWEETER
I had planned to have some N-800F schematic based crossovers built by a local speaker guru to suit the 16 ohm setup of woofer & tweeter..
My query is regarding the possible addition of a bullet tweeter to the A7 design to cover those really high sibilant frequencies & leave the 811 horn for the mids & highmids.. This would obviously require a different crossover design & a place to locate the tweeter physically so I ask:
a) how might the addition of a bullet tweeter (from a similar era) affect the overall efficiency of the design? Efficiency is paramount for me as i plan to use a valve amp to drive these babies.
b) which bullet tweeter might best suit the components I already have, I assume it also needs to be 16ohm to suit those components..?
Perhaps a pair of these JBL 075 16 ohm bullet tweeter?
c) Please see one of the attached sketched image for my idea as to where to place the bullet tweeter.. I think as close to the top centre of the 811 horn as possible is important? & I will not attach it to the top of the box until i have aligned it with the woofer & horn below..
d) is it a good idea to add the bullet, or do i not need to do it..? Id prefer to plan for it in advance rather than have to build a separate crossover later to add a bullet tweeter if i don’t do it in the beginning..
Thanks again happy to be on the journey..
62485