Not sure if this is right place to post this but here is what I got. I have a pair of Polk RC80i in ceiling speakers that I was going to install in ceiling of Livingroom but plans changed and the return window expired. So I thought that it would be cool to use them in a cabinet as floor standers to be powered up by a Schiit Aegir amp. Not sure if these would be good for a setup like that. I think they are decent efficient speakers. Just not sure size and design of enclosure to make them sing. Any thoughts?
Perfectly fine.
Test them and find out what their T/S parameters are.
I use LIMP, but REW is also a suitable option.
That will answer your question, re. enclosure size, type, loading, etc.
You also might need to modify the XO to include some BSC.
It's a good exercise.
Test them and find out what their T/S parameters are.
I use LIMP, but REW is also a suitable option.
That will answer your question, re. enclosure size, type, loading, etc.
You also might need to modify the XO to include some BSC.
It's a good exercise.
Yes those are the ones. Seems like they could sound good in a box. Just not sure how to go about it or would I be better off with a different speaker?
from the description, and the genre, ii expect it will have a highish Qt, and voiced for an IB/baffle reaches to the walls.
dave
dave
To further elaborate what Dave said on the previous post.
A ceiling speaker has many characteristics in common with car speakers. Both are designed to be put in a infinite wall closed box. If you use them with a different box they won't operate correctly.
In this case the speaker has a crossover, and I bet that this crossover has not any baffle step compensation built in, because the ceiling (an infinite wall) don't provide any baffle step to begin with. So if you put this speaker in a box, you suddenly have a baffle step and the sound at 100Hz is -6dB from 1000Hz (and gradually in between). Moral of the story: if you don't change the crossover the low frequencies are thin, and the speaker will sound bad.
For the second aspect (closed box), I expect that the mounting info describe the volume needed.
Probably you can use that speaker in a box, but you need to redesign the crossover for optimum performance.
Ralf
A ceiling speaker has many characteristics in common with car speakers. Both are designed to be put in a infinite wall closed box. If you use them with a different box they won't operate correctly.
In this case the speaker has a crossover, and I bet that this crossover has not any baffle step compensation built in, because the ceiling (an infinite wall) don't provide any baffle step to begin with. So if you put this speaker in a box, you suddenly have a baffle step and the sound at 100Hz is -6dB from 1000Hz (and gradually in between). Moral of the story: if you don't change the crossover the low frequencies are thin, and the speaker will sound bad.
For the second aspect (closed box), I expect that the mounting info describe the volume needed.
Probably you can use that speaker in a box, but you need to redesign the crossover for optimum performance.
Ralf
"In this case the speaker has a crossover, and I bet that this crossover has not any baffle step compensation built in, because the ceiling (an infinite wall) don't provide any baffle step to begin with. So if you put this speaker in a box, you suddenly have a baffle step and the sound at 100Hz is -6dB from 1000Hz (and gradually in between). Moral of the story: if you don't change the crossover the low frequencies are thin, and the speaker will sound bad."
What I said in post #3:
"You also might need to modify the XO to include some BSC."
Presuming that Qt will be high, maybe 0.6 - 1.2, it will be a good choice for an Aperiodic box. One still needs to know T/S data of that woofer.
Otherwise you'll be shooting in the dark.
Read this article, it will help you clarifying a few things:
6moons audio reviews: Polking fun at DIY speakers
What I said in post #3:
"You also might need to modify the XO to include some BSC."
Presuming that Qt will be high, maybe 0.6 - 1.2, it will be a good choice for an Aperiodic box. One still needs to know T/S data of that woofer.
Otherwise you'll be shooting in the dark.
Read this article, it will help you clarifying a few things:
6moons audio reviews: Polking fun at DIY speakers
That I can understand. I do seem to remember taking a set of 6x9 speakers out of my old car and building an enclosure for them back in the day. They did not sound like the "Trunk-thumpers" I had hoped for in my bedroom. OK scrap that idea. 🙂
Thanks for info
I don't know about the Polks, but I have 2 pair of JBL ceiling speakers that look similar. The are in heavy metal cans with a bass reflex port, they are not designed for IB or a large space. There is a matching subwoofer that is in a larger can.
If you are able to measure the T/S parameters (or find them) that would help you determine what you will get. They aren't doing to be earth shakers, but with a sub might sound rather good.
At one point I had the JBLs out of the can and into a sort of very large sound bar, left, center, right. All sealed enclosure and with a Dayton 12" sub in bass reflex. It kicked butt. I replaced the JBL ceiling speakers with Focal car coaxes and it was a definite upgrade. But the JBL weren't bad.
If you are able to measure the T/S parameters (or find them) that would help you determine what you will get. They aren't doing to be earth shakers, but with a sub might sound rather good.
At one point I had the JBLs out of the can and into a sort of very large sound bar, left, center, right. All sealed enclosure and with a Dayton 12" sub in bass reflex. It kicked butt. I replaced the JBL ceiling speakers with Focal car coaxes and it was a definite upgrade. But the JBL weren't bad.