Hey gang,
I recently picked up a set of these for a friend looking to upgrade from his small B&W standmounts on the cheap.
http://www.hifi-classic.net/review/polk-audio-ls-70-118.html
I was able to fix a voice coil rubbing issue by turning the offending driver around 180, worked like a charm, however I noticed on doing so that there was no stuffing behind the driver?
This is kind of a 2.5 way design? The driver I removed was just below the tweeter, plenty of stuffing between it and the lower woofer but none behind it?
I might try some foam I have around but I'm curious to know if this omission had a reason behind it? (pun intended)
I recently picked up a set of these for a friend looking to upgrade from his small B&W standmounts on the cheap.
http://www.hifi-classic.net/review/polk-audio-ls-70-118.html
I was able to fix a voice coil rubbing issue by turning the offending driver around 180, worked like a charm, however I noticed on doing so that there was no stuffing behind the driver?
This is kind of a 2.5 way design? The driver I removed was just below the tweeter, plenty of stuffing between it and the lower woofer but none behind it?
I might try some foam I have around but I'm curious to know if this omission had a reason behind it? (pun intended)
While not familiar with that model. What you describe is common with Polk speakers. Like the Monitor 10's for example. Nothing behind the passive radiator in bottom of cabinet. Design calls for it to be behind the upper mid woofers.
It's possible they identified a perturbance in the response due to a standing wave in that particular dimension.
When stuffing a box, it's hard not to consider that there may be a higher frequency reverb concern connected directly with the panel behind the mid. In this case even if there was an issue, maybe it wasn't enough to be a dealbreaker for the manufacturer. You could probably put a little in yourself without making too much difference.
When stuffing a box, it's hard not to consider that there may be a higher frequency reverb concern connected directly with the panel behind the mid. In this case even if there was an issue, maybe it wasn't enough to be a dealbreaker for the manufacturer. You could probably put a little in yourself without making too much difference.
Thanks for the responses guys.
I just found it curious that an otherwise apparently well built and designed speaker should have such an omission?
As they're not mine I'll probably not mess about with them too much but I'll mention it to the new owners when I eventually hand them over. Quiet enjoying them.
I just found it curious that an otherwise apparently well built and designed speaker should have such an omission?
As they're not mine I'll probably not mess about with them too much but I'll mention it to the new owners when I eventually hand them over. Quiet enjoying them.