I realize that this is an older thread, but the nature of the OP suggests that it continue on.
In that regard, I snapped up four Minimus-7W yesterday off CL for $25.
The Minimus-7W speakers have the same design as the original Minimus-7, but with genuine oiled walnut finish and a removable cloth grill. The 7W debuted in the
Radio Shack Catalogs in 1985 [1]. They have a Long-Excursion 4” Woofer and a 1” Soft-Dome Tweeter. The 1985 catalog lists the size as 8x5x4” with a price of $49.95.
The back labels are silver with black lettering as follows:
REALISTIC
MINIMUS-7W CAT.NO. 40-2039A
INPUT 8 OHMS 40W (MAX.)
CUSTOM MFD. IN JAPAN FOR RADIO SHACK
A DIVISION OF TANDY CORPORATION
- +
The “QC“ labels are as follows:
QC........ QC........ QC......... QC
NO. 57.. NO. 59.. NO. 793.. NO. 9xy
12A6.... 12A6..... 12A6...... 12A6
The QC label for 9xy is ripped such that the numbers to the right of “9” are unreadable.
I performed a
Stereo Polarity Sound Test [2] with 59 on the right channel and 57, 793, and 9xy on the left channel.
1. 57 is out of phase with 59.
2. 793 is in phase with 59.
3. 9xy is in phase with 59.
4. When the speaker leads to 57 are reversed, 57 is in phase with 59.
All four seem to work well and sound pretty good. The woofers and the tweeters in all four speakers seem to work and pass the
Low Frequency Response and Subwoofer Test [3] and the
High Frequency Response and High Pitch Hearing Test [4]. It seems that I can hear the 19 KHz pitch better than the 18, 17, 16, and 15 KHz pitches. I cannot hear the 22, 21, 20, 18, 17, 16, and 15 KHz pitches. I do hear the 14 KHz and below pitches.
References
[1]
http://www.radioshackcatalogs.com/catalogs/1985/, page 21.
[2] Stereo Polarity Sound Test.
http://www.audiocheck.net/audiotests_polaritycheck.php
[3] Low Frequency Response and Subwoofer Test.
http://www.audiocheck.net/audiotests_frequencychecklow.php
[4] High Frequency Response and High Pitch Hearing Test
http://www.audiocheck.net/audiotests_frequencycheckhigh.php
