Hi,
I thought that only the 813A or 813B or 813C ( versions had the added foam on the horn ).
No-matter, you could do something like this ( using felt ).
Hi,
I thought that only the 813A or 813B or 813C ( versions had the added foam on the horn ).
No-matter, you could do something like this ( using felt ).
Last edited by Earl K; May 4th, 2019 at 11:04 AM.
You could be correct. The felt looks great! I finished the crossover rebuild today. Adding some terminals and adding the 10uF capacitor as per the 813 manual. I then tested them with some cheap drivers I had lying around and the seem to work ok. I need to get a few missing screws before I can reassemble the whole system. A couple ideas I have include installing Altec 411 woofers in lieu of the eminence to improve the bass response (probably need to modify the cabinet to provide the seal enclosure it needs and to add a super tweeters but that will be at some point in the future.Originally Posted by Earl K
Hi,
I thought that only the 813A or 813B or 813C ( versions had the added foam on the horn ).
No-matter, you could do something like this ( using felt ).
Last edited by kwingylee; May 5th, 2019 at 10:39 AM.
No foam on the lips, and no slots on the first version blue horns. I'm no expert, but i think i recall the earliest versions of 811 and 813 using the factory Altec sectoral horn on the 604.
Consider a 416 for a helper woofer, the 411's sensitivity is too low to couple it passively.
Not all vegetables make good leaders.
hello,could the light bulbs possibly be for driver protection from excessive power input to the system as a whole.i have not looked myself,but did the schematic show the light bulbs in the three passbands to the three different drivers.if they are not on the schematic or any updated tech bulletins,in all probability they were added aftermarket or customized by the owners/users.there may not be any significant loss of quality from the light bulbs other than the slight resistance they might add to the circuits.others on the board may have a more in depth analysis on this modification.just thought i would throw that out there.
I missed the bit about the bulbs.
Light bulbs in a crossover network are almost always there for the purpose of current limiting. High acoustic output, and high power handling were important design goals in the Urei monitors.
I'd want to be reasonably certain about what i was doing before bypassing any of them.
Not all vegetables make good leaders.
Appreciate the ad. It clearly shows no foam on the horns. Very cool.
The bulbs are in the schematic. One bulb for each pass band.
I plan to drive the system with a 45W/ch tube amp. I dont plan to ever light the bulbs but seems the removal of the additional filament resistance would change the system's voicing.
I completely mounting of the crossovers last week, plan to mount the drivers this weekend and fire them up.
Last edited by kwingylee; May 9th, 2019 at 01:57 PM.
Hello Kwingylee
Have you noticed any differences in the audio presentation since the modifications to the crossover?
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