Does anyone have any information on these tweeters? They are 5" square and have 1-1/2" domes. I opened one up and the plastic mounting plate was stamped "Made in Germany"
Thanks in advance.
Thanks in advance.
Early Peerless were made in Denmark. ADS tweeters were made by Braun of Germany.
I wont hedge any bets, but I think these are Magnat tweeters made by Braun.
I wont hedge any bets, but I think these are Magnat tweeters made by Braun.
Yes! I bet you are right. The ADS L1290 (good speaker in it's day)... google the image and it looks like the midrange is the same as the OP's pic.
I have a pair of L880's, they & the L1290's (and others in that line) used a 2" mid-dome that was clear-ish in color, no holes. I haven't handled any (late 70's-early 90's) A/D/S domes that were plastic, metal only. None from other Braun, or HECO either for that matter- but my experience is far from comprehensive. I have zero knowledge of Magnat drivers.
The holes in the fabric should be a telltale clue for someone. Polk did that early on with their 1" Peerless domes, a single hole top center, IIRC.
The holes in the fabric should be a telltale clue for someone. Polk did that early on with their 1" Peerless domes, a single hole top center, IIRC.
Thanks again for the replies. Searching google images has not produced a match so I'm wondering if there is a thread that outlines a step by step way of testing these to find out some basic specifications? I tried searching "testing tweeters" but came up with nothing useful to a novice.
Any suggestions?
Any suggestions?
If I were starting with an unknown tweeter:
1) Start with an impedance sweep. I have DATSv3, but there are other ways of doing it. I would expect a 1.5 inch dome to have an Fs of 400 to 800 hz. Other than that the impedance should be smooth. Abrupt jumps are a bad sign.
2) Do a frequency response measurement. I would use cardboard or foam board to make a baffle of about 26 x 36 inch. I use Omnimic, but REW and a cheap USB mic will do the job also. The FR should look reasonable, it should look like something I could work with.
3) I would make harmonic distortion measurements. I like odd order HD to be less than 1% in the pass band. 2nd order HD can be a little higher at perhaps 2%... but lower is better.
1) Start with an impedance sweep. I have DATSv3, but there are other ways of doing it. I would expect a 1.5 inch dome to have an Fs of 400 to 800 hz. Other than that the impedance should be smooth. Abrupt jumps are a bad sign.
2) Do a frequency response measurement. I would use cardboard or foam board to make a baffle of about 26 x 36 inch. I use Omnimic, but REW and a cheap USB mic will do the job also. The FR should look reasonable, it should look like something I could work with.
3) I would make harmonic distortion measurements. I like odd order HD to be less than 1% in the pass band. 2nd order HD can be a little higher at perhaps 2%... but lower is better.
I have a Smith & Larson Woofer Tester 2 that I have used on some woofers but have not tried it on a tweeter yet.
I have a good mike and preamp, what is a good software to use for the FR?
I have no clue how to do HD measurements, what equipment and software do I need?
A lot of people like REW software. It is free. It will do gated frequency response measurements and harmonic distortion measurements.
REW - Room EQ Wizard Room Acoustics Software
REW - Room EQ Wizard Room Acoustics Software
