I will start off by stating I did not purchase this W4-1720 from PE and is only being posted in effort to save anyone else troubleshooting time.
For reference, here is the build thread:
Evidently there was going to be more of a “twist” then I could have realized…
The symptoms of this defect were the same as a small enclosure leak present only during heavy low frequency reproduction.
At first I thought this was a dust cap adhesion problem as stated in the build thread. Once I removed the speaker and inspected the area of concern, I quickly noticed the uneven cone transition area as noted in the linked pictures.
Conclusion: Manufacturing defect along the glue line of the cone to voice coil former.
For reference, here is the build thread:
Evidently there was going to be more of a “twist” then I could have realized…
The symptoms of this defect were the same as a small enclosure leak present only during heavy low frequency reproduction.
At first I thought this was a dust cap adhesion problem as stated in the build thread. Once I removed the speaker and inspected the area of concern, I quickly noticed the uneven cone transition area as noted in the linked pictures.
Conclusion: Manufacturing defect along the glue line of the cone to voice coil former.
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