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I thought I'd start this thread to answer any questions about the SR71 design I just did. I also welcome anyone else to discuss their own usage of the ER18 in their designs. Of course, I'd prefer to hear from people who actually used the woofer rather than those just toying with simulations and making guesses at what actually sounds good.
Knowing the forum rules, I got permission from Thomas to discuss this design. It is a kit, but the difference is that I was not paid to do the design and I don't get a cut of any profits from kits sold at Madisound. It's completely non-profit for me. As such, I am allowed to have a discussion about it. I'll participate here for a week or two to answer questions, maybe clarify some things, and flesh out the design info on the web page if needed.
I already had the design done when I was having a chat with Madisound about some other stuff. The kit was just basically a way for people to round up the parts with one click rather than hunt for everything I mention in the web page. When I found out that they would give a 10% discount on the parts, that sealed the deal since I'm all for saving people money.
The coil upgrade option was their idea. They know my standing on high end crossover components, but they also have a good grasp on what their customers want to buy. Some people fear steel laminate cores, so I let it go. The Clarity SA cap on the tweeter is what they call a mid-priced cap. Though I generally use the Bennic Polys, I let that go also since they aren't too expensive. It's certainly not going to break the bank like a Mundorf or Hovland. Anyway, let's not waste this discussion on crossover parts.
To get things rolling with a question I saw elsewhere:
The reduced BSC version has roughly 3-4 dB of BSC. It wouldn't make much difference in the overall tonal balance if you converted to a tower. I would only recommend the reduced BSC version for those with poor placement options. I built that version and the bass pretty much sounded too lean in any room I put it in.
When I was going through the early crossover iterations on this design, the primary woofer inductor ranged from 2.2 - 2.5 mH simply because that's what ended up in most of the other 7" woofer designs I've done. That just didn't work in this design because the tonal balance was too lean. I had some speculation into that noted somewhere in the design pages.
If not tied into a Madisound enclosure, I'd probably go 15-16 liters, and tune it to 40-42Hz.
Knowing the forum rules, I got permission from Thomas to discuss this design. It is a kit, but the difference is that I was not paid to do the design and I don't get a cut of any profits from kits sold at Madisound. It's completely non-profit for me. As such, I am allowed to have a discussion about it. I'll participate here for a week or two to answer questions, maybe clarify some things, and flesh out the design info on the web page if needed.
I already had the design done when I was having a chat with Madisound about some other stuff. The kit was just basically a way for people to round up the parts with one click rather than hunt for everything I mention in the web page. When I found out that they would give a 10% discount on the parts, that sealed the deal since I'm all for saving people money.
The coil upgrade option was their idea. They know my standing on high end crossover components, but they also have a good grasp on what their customers want to buy. Some people fear steel laminate cores, so I let it go. The Clarity SA cap on the tweeter is what they call a mid-priced cap. Though I generally use the Bennic Polys, I let that go also since they aren't too expensive. It's certainly not going to break the bank like a Mundorf or Hovland. Anyway, let's not waste this discussion on crossover parts.
To get things rolling with a question I saw elsewhere:
Originally posted by peter_m
When I was going through the early crossover iterations on this design, the primary woofer inductor ranged from 2.2 - 2.5 mH simply because that's what ended up in most of the other 7" woofer designs I've done. That just didn't work in this design because the tonal balance was too lean. I had some speculation into that noted somewhere in the design pages.
If not tied into a Madisound enclosure, I'd probably go 15-16 liters, and tune it to 40-42Hz.
ops: .
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