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Post by craywm on Dec 28, 2014 11:06:18 GMT -5
What is the accepted opinion of testing the speaker with a DC 9V battery on leads to detect diaphram movemont?
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Post by mastertech on Dec 28, 2014 19:18:55 GMT -5
Well I do not know of there is an accepted opinion or not, lol. I would not suggest it though.
Usually when a speaker fails it goes open. So you can just test it with an ohm meter. But even if it was overheated and the coils shorted and did not go open you would probably show a lower then spec ohm reading. Other wise test on a known good receiver but only if a normal ohm reading is there.
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Post by craywm on Dec 28, 2014 20:16:32 GMT -5
Thanks master, here are some prelim measurements. Im only getting 3.7 ohms accross the speaker... When i opened it up... The speaker wasnt even connected.
Measurements from leads to speakers (no input, mV)
AC: 9.0 mV AC
DC: 17.5 mV DC
My guess... DC voltage to speaker caused failure which is why im only getting 3.7 ohms (shouldnt it be 8 ohms for athena?). So a speaker and replacement on board would be necessary?
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Post by craywm on Dec 28, 2014 20:37:37 GMT -5
Not sure which leads go to which pins on the speaker but im getting a MAJOR signal after i pluger speaker in. Granted i used my ipod.. will try to test dc/ ac with cutoff comp instaled
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Post by mastertech on Dec 28, 2014 20:38:36 GMT -5
Not really. That could be a 4 ohm speaker. Subs do sometimes come with that. Is there an ink stamp on the speaker anywhere? Does the spec sheet for that sub indicate anything?
17.5 mv DC is not much and is probably normal.
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Post by craywm on Dec 29, 2014 18:37:22 GMT -5
I did connect the leads and use the subwoofer last night which watching the "bourne supremacy". Some good scenes in there to test the bass, like flash back scenes. It was a bit "boomy" even with adjustment of the crossover (still hard for me to understand how exactly to balance crossover with speaker level setting). As I noted before, this is a 10" woofer front firing and 6 of my speaker screws are missing! the speaker is held in with only 2 screws! I've attached a pic of this. Any one know where to get these screws? Also, I've opened up a few woofers and usually see more "packing" material inside them. this one seemed low on the packing side. I was concerned that possibly this was causing airflow to be undistributed equally and attribute to the "boominess" that I had heard. I had it side by side with a Polk audio 100 W 10" sub and the Polk was set at 105 for cross over and I had to tone the Athena down to 80-90. I've attached a pic of the packing as well. Is it possible that uneven packing could attribute to boominess with this woofer?
Master, The owners manual says that this is an "8 Ohm subwoofer" but the speaker only measure 3.7 ohms. As you previously stated, it could be a 4 ohm speaker. I attached a pic of the sticker attached to the speaker (pretty sure this is legit athena since its made in canada). Does it make sense that after all the amplification the signal goes through that overall the woofer impedance would qualify as 8 ohms? Or, do companies generally give the spec for ohms as that of the speaker within the subwoofer? I was able to hook the "+/-" leaks to the correct terminals. + being red/black wire and - being white/black (wires change color). Also, To but the foam ring that covers the speaker screws back on, is Elmer's glue acceptable? I didn't want to use anything way too strong here that would cause cabinet damage when I wanted to remove to ring to expose the screws.      |
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Post by mastertech on Dec 29, 2014 23:45:13 GMT -5
Elmers glue should be fine. If it was an 8 ohm speaker and shorted to read 3.7 ohms then it probably would not even work. So I would disregard the reading. Other then that you are on your own, lol.
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