Thanks for this suggestion. I did it this way and checked for continuity with multimeter between the HF and LF +ve terminals. They are shorted out. I had removed the copper jumpers as u suggested. I think i have no choice but to open up the speaker.
I will be opening it later and that should answer some of the questions. I tried connecting just HF terminals to see if tweeter was working. It had sound coming through but at a low level. Is this normal ?
Last edited:
From that measurement in the original post were not just looking at a reverse polarity connection there is a complete lack of high frequency energy. If all of the hardware was operating properly I'd have assumed this was near field with the mic on axis with the woofer.
If this is 1 meter away on the tweeter axis then something really isn't right. If the tweeter are working properly then there is definitely wrong with the hardware set up or software settings.
If this is 1 meter away on the tweeter axis then something really isn't right. If the tweeter are working properly then there is definitely wrong with the hardware set up or software settings.
There shouldn't be!! But if the tweeter is incorrectly wired, then perhaps some other errors, hence the checkJust don't want to suggest something that results in a blown up amplifier!
Tony.
This is how i wired the jumper wires.
With a multimeter I tested both the red HF and LF terminals. Continuity test shows that they are connected and has a 4 ohm resistance. The same is true for the black HF and LF terminals. Now I am just scratching my head as to what I have done wrong. Continuity testing all the terminals shows that each and everyone of it is connected to each other.
how come you reversed the polarity on the woofer too ?
try this,
positive to positive ( woofer )
Negative to Negative ( woofer )
Positive to Negative ( tweeter )
Negative to Positive ( tweeter )
No measure
I believe thats how its wired in the pic zeeup. The white wire is positive and it goes to the positive woofer thru the blue jumper cable. The black wire is the negative and it goes to negative woofer terminal thru the green jumper cable.
sorry my bad, hard to understand how they wired and placed them terminals.
If it hold M71 is the model here link to "stereophile" review and measurement Mission m71 loudspeaker Measurements | Stereophile.com.
Honestly bit curious what's the cause
.Attachments
I have opened up the speaker to take a look at the crossover. I have also tried tracing the parts to make an initial sketch of the schematic. Those blue capacitors in the pictures are they polarized electrolytic capacitors ? I modelled all the caps as bipolar. My electronics knowledge is kinda of rusty and had to use google to decode those values. I can't find out the values for all of the inductors.
Last edited:
I think my camera is not good enough. That rust like thing u see is actually wood dust from the cabinet. Must have gotten there when i was unscrewing it.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.