Single pringle looking to mingle. Has a bit of character, but the throat and mating surface are right and tight.
Distribution Pattern 90°H x 40°V
Lowest Recommended Crossover Frequency 500 Hz, 511b (1200 Hz when used with 902-8A or 902-16A drivers)
Pressure Sensitivity Measured on axis in the far (free) field with 1 watt input of band limited pink noise from 500-3000 Hz and calculated to 4' equivalent (Ref.: O dB= 0.0002dyne/cm2)
Compatible drivers 902-8A / 902-8T / 902-16A / 908-8A / 731B (limited frequency range)
Dimensions 10.625"H x 23.625"W x 18.5"D
Weight 17.75 lbs.
ALTEC 511b and 811b Sectoral Horns are designed for the mid or high-frequency section of two-way or three-way sound systems. The 511b and 811b differ only in cutoff frequency and size. Exponential expansion and a straight throat configuration ensure uniform control of the sound dispersion pattern—90° horizontal by 40° vertical—and exacting reproduction of the middle and high frequencies. Of lightweight aluminum, these horns feature a front-mounting flange for easy installation. Recommended for use with these horns are the ALTEC 902 series, the 908 series, and the 731C High-Frequency Drivers. The 511MB Accessory is available to aid in mounting the larger 511b Horn. The mounting bracket supports the throat and attached driver of the 511b while allowing adjustment in the horizontal plane.
Single pringle looking to mingle. Has a bit of character, but the throat and mating surface are right and tight.
Condition
8/10
Serial No.
62054
Factory Specs
Distribution Pattern 90°H x 40°V
Lowest Recommended Crossover Frequency 500 Hz, 511b (1200 Hz when used with 902-8A or 902-16A drivers)
Pressure Sensitivity Measured on axis in the far (free) field with 1 watt input of band limited pink noise from 500-3000 Hz and calculated to 4' equivalent (Ref.: O dB= 0.0002dyne/cm2)
Compatible drivers 902-8A / 902-8T / 902-16A / 908-8A / 731B (limited frequency range)
Dimensions 10.625"H x 23.625"W x 18.5"D
Weight 17.75 lbs.
Liner Notes
ALTEC 511b and 811b Sectoral Horns are designed for the mid or high-frequency section of two-way or three-way sound systems. The 511b and 811b differ only in cutoff frequency and size. Exponential expansion and a straight throat configuration ensure uniform control of the sound dispersion pattern—90° horizontal by 40° vertical—and exacting reproduction of the middle and high frequencies. Of lightweight aluminum, these horns feature a front-mounting flange for easy installation. Recommended for use with these horns are the ALTEC 902 series, the 908 series, and the 731C High-Frequency Drivers. The 511MB Accessory is available to aid in mounting the larger 511b Horn. The mounting bracket supports the throat and attached driver of the 511b while allowing adjustment in the horizontal plane.
Stock No.
8302149304541
