• These commercial threads are for private transactions. diyAudio.com provides these forums for the convenience of our members, but makes no warranty nor assumes any responsibility. We do not vet any members, use of this facility is at your own risk. Customers can post any issues in those threads as long as it is done in a civil manner. All diyAudio rules about conduct apply and will be enforced.

Pair of Peerless P830549 NOS Passive Radiator

I have a brand new pair of P830549 Peerless XLS 12' passive radiators that I purchased to make a pair of subwoofers.

I have been unable to find a pair of matching Peerless 830500 XLS 12"woofers. I had previously built three such sealed subwoofers and use one every day for my home theater system.

These are for sale to someone who can give them a good home. Make on offer!

-david BTW

P.S. I built the original design based upon a Peerless application note but tweaked by George Short of North Creek Music as the Thunder Product.


  • IMG_1296_0055.jpg
    883.8 KB · Views: 343
  • IMG_1297_0056.jpg
    887.8 KB · Views: 376
Last edited:
Hello madam.

Yes you are correct about the weighted passive radiators. I couldn't get but one 830547, which I purchased from George. I built three Thunders one with the passive radiator and Georges power amp, the other two with the 830549s. I carefully weighted both of them and added weights to the 549s until they matched the 547.

Then I planned to build some more and that is where the two passives for swap/sale came from. The ones for sale are NOS without modifications However everyone sold out of the main drivers before I could get them.

Yes I do have a .pdf of the Thunder plans. Please PM me.

-david BTW
Hello madam.

I carefully weighted both of them and added weights to the 549s until they matched the 547.

-david BTW

How is it possible to reduce the Mms of the 549s to get the 830547 300g Mms?

They add the extra mass with the bolt + washers in the factory as well?

Will send you a PM, if I need the construction plans, at the moment I do not know if I build the PR or the vented version.
Limited budget these days, and don't know the AUDIABLE difference between the two.

Anyway, THX for the offer.