Printable View
Picked up a pair of 828 cabs last weekend. Loaded the cabs with 515b's. On top are the 288C/311-90 horns. I am using the N 500 C dividing network. On the face of the dividing network there are three rows of screws. Numbers above the screws are 0 thru 4. I am assuming that by moving the the jumper from 0 to 1 will change the HF attenuation? I could not find any liturature on these but will have to use them until I can upgrade. Thanks for any help on this.
Yes, the rows of screws allow one to to provide for attenuation of the HF response by up to 4dB (each number represents negative dB.
If I recall correctly, one row of screws are taps on a choke, the other row of screws are resistors wired in series, the last row of screws are tied together and to the HF output. Thus, by moving the link (it straps all three screws in a column) you are changing the LR characteristic to affect the response.
Steve
Thanks Steve, I thought that might be the case. Will try that tommorrow. I have wanted a set of A7's for a long time. Now that I have them, it's really a lot of fun working on them. I fabbed up some hardware to mount the 311's on top of the cabs.
I used yokes to attach to the horns, threaded at one end. 3/8" aluminum rods threaded at one end, and screwed the moumting flages to the top of the cab. This sets the flare of the horn 3" above the top of the cab. Very solid, but I just don't like the way it looks. Thinking a wood enclosure for the horns might look better. Thanks again for your help. A7