I am usually not a big fun of somebody refer to eBay Items and I myself do it very seldom. Still, here I am as I think it is an interesting deal for someone. There is a guy out there that is damping a few of Aura RS-8.1 bass modules.
They are Aura 1808 drivers in already built-in, accurate and nice looking enclosures. The price I think is reasonable for the pair of the boxes and since they are in crates then it will be assurance that they will be delivered in pristine shape. The guy will ship, I spoke with him. Use tracking freight service and ship on pallets if you go for it.
What I find is interesting in that that for $1.5K somebody will have right out of shelf, ready to go ULF channels with very good drivers. Do not think that you will be able to run them to 100Hz. Well, sure you will be able to but if you like THAT sound then you is a deaf Moron. This configuration is not for bass generally but for sub 30Hz bass. Also, they are ported, so do not do fantasize about midbass from those woofers.
If you have 40Hz-60Hz horn then you might play with Aura RS-8.1 bass modules and it is possible that it will do very well, crossing them at let say 30-35Hz and to have pain-free and none expensive implementation. I do not know how good the boxes constructed, I do not know if the ports are re-tunable, in fact I do not know anything about them but frankly if I had space for them than I would try them myself. All investment that needs to be done is to replacement the red front grill with black fabric and it is under $10. I do not want to use this configuration in my room – 22” wide it too wide for me, otherwise I would bite it.
Anyhow, whoever is interested – it is all your. Since the guy has a lot of them he might be flexible in price and if you can pick them up than I am sure he will be more accommodating. If you get them then post how you employ them and how they sound.
Good luck, The Cat
"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche