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Horn-Loaded Speakers
Topic: Vintage Altec drivers / horns lingo.

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Posted by Romy the Cat on 04-24-2005

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LOW FREQUENCY DIRECT RADIATOR DRIVERS

411A –18Hz, 93dB, sealed box
414A - 99dB, 30Hz, Alnico, cloth
416B – Alnico, 97dB, 25Hz, cloth
416C – 16” version of above with Ferrite
416Z - 12" version
417C – 100dB, 69Hz, Alnico, 1.3T, 12”
418B – 100dB, 55Hz, Alnico, 1.3T
419 – low power, 96dB, 40Hz, Alnico, 12”
420 - low power, 97dB, 27Hz, Alnico
421A –40Hz, 97dB, cloth, Ceramic
421H –30Hz, 1.44T, 97dB, cloth, Alnico
421LF –35Hz, 97dB, cloth, Ceramic
425A –72Hz, 99dB, 1.3T, cloth, Alnico
515B - 103dB, 25Hz, Alnico, Cloth
515C – 16” version of above
515E – Ferrite version of above
515-8G, 515-16G – 16”, 103dB, 37Hz, 1.5T, ferrite magnet, horn use.
515-8GH, 515-16GH  –same as above but extended power handling
803A –30W, 114dB, 25Hz, Alnico, 1.2T
803B - 99dB, 25Hz, Alnico, Cloth
604, 604, 904 - Dual Drivers
755A  - 8”, Alnico, 90Hz, 97dB

SMALL COMPRESSION DRIVERS

802B, 802C, 802D  - 20W-30W, 1.5T, 109dB, aluminum, Alnico
802G – same as above, extended HF via lighter and more fragile cone
804A, 804B – 1.3T, 20W, 107dB, aluminum, Alnico
807A – 109dB, Alnico, 1.3T, symbiotic
808A – 1.5T, 111dB, Alnico, symbiotic cone
808B - 1.5T, 104dB, Alnico, Tangerine plug
902A – same as 802 but with ferrite
902B – 106dB, Ferrite, 1.8T, high handling power.
902T – same as 902A but with excursion stopper
909A – 30W,  ceramic, 1.7T, 1110dB
908B – 1.8T, Ferrite, symbiotic, high power

LARGE COMPRESSION DRIVERS

288B, 288C, 288D, 288E – 20W, 109dB, aluminum diaphragm and fragile Alnico magnets
288G – extended HF of the above, 111dB
288H – same as above, extended HF via better phasing plug
288K, 288L – same as above, ceramic magnet.
290D, 290E – very high dissipation power, 114dB, weather-proved. 
291A, 291B, 299A  – similar to 288 but with symbiotic cone permitting high power dissipation.

MIDRANGE HORNS

31B – 40 x 120, 3 half-sections, 300Hz
329A – one section 40 x 90, 220Hz
311-60 – 40 x 60, 3 sections, 220Hz
311-90 – 40 x 90, 4 sections, 220Hz
511 – 40 x 90, 3 half-sections, 500Hz
811 - 40 x 90, 3 half-sections, 800Hz
329 - 40 x 90, 3 half-sections, 800Hz
203  - 20 x 90, 1 x 2 sections
803  - 35 x 75, 2 x 4 sections
804  - same as above 2 drivers
805  - 40 x 80, 2 x 4 sections
1003  - 35 x 90, 2 x 5 sections
1004  - 40 x 100, 2 x 5 sections, 4 drivers
1005  - 40 x 100, 2 x 5 sections
1504  - 60 x 105, 3 x 5 sections, 4 drivers
1505  - 60 x 105, 3 x 5 sections
1803 - 53 x 105, 3 x 6 sections, 300Hz
1804 - 60 x 125, 3 x 6 sections, 400Hz, multiple drivers.

Rgs,
The Cat


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