|
Speaker Asylum General speaker questions for audio and home theater. |
|
|
|
Speaker Asylum General speaker questions for audio and home theater. |
|
Cabinet dimensions are: 23 ¾” high, 19” diameter.
Weight = 40 lbs.
Cabinet (sealed) volume = approximately 1.8 cu. ft.
Calculated from an extruded triangle 8 7/16” X 8 7/16” X 21 ¼”
Plus
Rectangular cube 7 7/8” X 14 ½” X 21 ¼”
The speaker assembly consists of:
A high compliance 10” woofer with a treated cloth surround, P/N 3001Aa, 8 ohms, 45.10.07 (not sure what this means) with no wattage rating stated;
Two 4 ½” tweeters with treated cloth surround, P/N 0705Aa, 16 ohms, nominal 5 watts, music max. 10 watts, 2-15kHz, connected in parallel. Whatever the cloth surrounds were treated with remains sticky even to this day.
Specification says an amplifier with a minimum of 10 watt minimum output is needed. 20-20,000Hz is stated as the frequency response with no indication of how much the dB response varies over that range. Nominal impedance is stated to be 8 ohms.
The sound from these speakers has pretty solid low end, but poor high frequency response and dispersion. The tweeters are mounted recessed in the 5/8” thick plywood used as a baffle board. That in combination with being mounted behind angled decorative grilles prevents wide angle dispersion of the mid and high frequencies. High frequencies are significantly attenuated and stereo imaging is poor. These speakers were apparently designed mainly for appearance.
The design approaches a sealed cabinet, but there is no sealing compound used to fasten the bottom of the cabinet to the top and sides, so sealing is poor if it was supposed to be a sealed cabinet design. There is a single large piece of fiberglass inserted in the back portion of the cabinet behind the woofer and two more pieces near the tweeters.
A better choice would have been to use a larger enclosed back mid-range drivers and one or two surface mounted dome type tweeters mounted directly behind the decorative grilles. An even better approach would have been to mount two mid ranges and two tweeters directly behind the angled front with level controls and do away with the decorative grilles.
By contrast the 1962-1968 AR 2AX speakers had a cabinet volume of about 1.5 cu. ft.
The paralleled mid-range/tweeters are fed from the + input terminal through a 3.3mFd non-polarized capacitor through a 4.7mFd non-polarized capacitor paralleled with a 6 ohm 5 watt resistor.
The 10 inch woofer is fed from the + input terminal through an inductor (not measured yet).
This post is made possible by the generous support of people like you and our sponsors:
Topic - Radio Shack Optimus 6 Speakers - strijw426 07:38:54 05/26/13 (2)
- RE: Radio Shack Optimus 6 Speakers - strijw426 13:35:54 05/26/13 (0)
- RE: Radio Shack Optimus 6 Speakers - Coner 12:59:32 05/26/13 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
