I have a B&W FCM8 + PCS8 I am currently using. And I put a 3 mH inductor in the PCS 8 sub which is a 12" relative of the woofer in the 801, and the FCM8 has a 68uf cap in line and they are wired parallel to a onkyo TX SV 909 which is operating in 2 channel mode. These 2 fronts are the only speakers in the setup.
On the low freq's there is a rattle in the FCM. This rattle was there when the fcm8 was used alone too, but it was a bit worse. Put in with the PCS8 with 425 hz first order XO out of the pcs8 and 425 hz first order into the FCM8, I still have the rattle.
Here is I think some relevant info. FCM is a sealed cabinet. Its a 6 ohm speaker, with 2 X 6" drivers and 3 hard dome tweeters in each cabinet. Very well made, for what is basically a tall bookshelf speaker.
The PCS8 is vented, but the rattle is definitely in the fcm8.
I'd blame something else, like the amp, or something else ... but ... the infinity kappa 5.1 I tried without the sub worked remarkably well and did not rattle. I have a infinity refernce four that has similar drivers to the kappa 5.1 but in a sealed cab I could test my or any other theory on.
The answer has to be in the vent or lack there of ... and the fact that my TX SV 909 produces "teenager with daddy's $$$ buying a tin can ricer that's smoking worse than him but fitted with a 15" in the trunk and a 5000 watt amp" when he drives by, you can hear his windows rattle above the windows of your house ...
But I am filtering out 425 hz and below with a first order from the fcm -
Anyone know a different possibility ?
Should I try a second order ? Its original XO is still intact - the cap is before that on the binding posts - the floor is 425 first order. A 68 uF bass blocker.
Cool.
Srinath.
On the low freq's there is a rattle in the FCM. This rattle was there when the fcm8 was used alone too, but it was a bit worse. Put in with the PCS8 with 425 hz first order XO out of the pcs8 and 425 hz first order into the FCM8, I still have the rattle.
Here is I think some relevant info. FCM is a sealed cabinet. Its a 6 ohm speaker, with 2 X 6" drivers and 3 hard dome tweeters in each cabinet. Very well made, for what is basically a tall bookshelf speaker.
The PCS8 is vented, but the rattle is definitely in the fcm8.
I'd blame something else, like the amp, or something else ... but ... the infinity kappa 5.1 I tried without the sub worked remarkably well and did not rattle. I have a infinity refernce four that has similar drivers to the kappa 5.1 but in a sealed cab I could test my or any other theory on.
The answer has to be in the vent or lack there of ... and the fact that my TX SV 909 produces "teenager with daddy's $$$ buying a tin can ricer that's smoking worse than him but fitted with a 15" in the trunk and a 5000 watt amp" when he drives by, you can hear his windows rattle above the windows of your house ...
But I am filtering out 425 hz and below with a first order from the fcm -
Anyone know a different possibility ?
Should I try a second order ? Its original XO is still intact - the cap is before that on the binding posts - the floor is 425 first order. A 68 uF bass blocker.
Cool.
Srinath.
I was thinking of unscrewing the connector panel and letting in air so it acts like a vent ...
Cool.
Srinath.
Cool.
Srinath.
I believe its the furniture and the other miscellanii I have lying about the place that was rattling. It sounded like it was coming from the speaker. Further investigation required.
Cool.
Srinath.
Cool.
Srinath.
I'd first remove the enclosure from it's resting place and put it on a thick rug or carpet on the floor and drive it - hard if needed. If no rattling is heard, then it's the bookshelf(?)/furniture that's rattling when driven hard.
If the loudspeaker rattles even placed on a carpet on the floor, then it's something inside it and it could be one of the drivers or perhaps a crossover element that is no longer properly fastened on the PCB.
If the loudspeaker rattles even placed on a carpet on the floor, then it's something inside it and it could be one of the drivers or perhaps a crossover element that is no longer properly fastened on the PCB.
If it's woofer and rattle at large excursions (when playing bass) then it is possible that solder joint between coil and a lead from terminal that connects it to internal speaker cable got loose. I had this with more than one Audax driver, a pain to fix though, but nothing impossible 🙂
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