Little speakers are easy to make. What do you think about this in 3.5 liter box? Adding normal 12PAC would make little 2.5way.
Sounds like a good idea.
And the larger little box would be easier to port & save money on PRs(tho 4 would look cool).
And the larger little box would be easier to port & save money on PRs(tho 4 would look cool).
I made 14x19x21 cm box using 12mm board. Internal volume is 3.5 liter. Passive is Peerless SDS-P830880. It gives 45 Hz tune. Little higher could be better.
It is very near field (max 5mm) measurement mic in middle of drivers. Purpose is to show bass response to about purple mark. Are you familiar with Vituixcad?
Ah. I thought so, just wondered why post the graph with HF.
While I like your setup, I wouldn’t pick <60Hz tuning for such small woofers any more.
While I like your setup, I wouldn’t pick <60Hz tuning for such small woofers any more.
Yes, I am planning higher tune. It is not very easy to adjust. My goal is 50-55 Hz. Two possibilities, smaller box or lighter mms of passive. Now mms is 48g. Easy way would be SB passive with 36g mms.
I think I will tune Peerlees with angle grinder. 🙂
I think I will tune Peerlees with angle grinder. 🙂
Hi, since you're (one the ) the first to have hands-on experience with the new 4" SB aluminium coaxial - do you have further measurements or a subjective assessment of the driver? How does the HF part behave? The HF response seems to be a bit rollercoaster-like when looking at the datasheet. Did you make any attempts at designing a crossover yet?
I am looking for a suitable driver in a fun project (spherical speaker made of two IKEA Blanda bowls) and the SB12PACR seems to fit the bill. Due to space constraints I would use it with the SB12 passive membrane though (knowing that I exceed xmax on the PR before reaching xmax with the coaxial). But I'm curious what you think of the coaxial in general...
I am looking for a suitable driver in a fun project (spherical speaker made of two IKEA Blanda bowls) and the SB12PACR seems to fit the bill. Due to space constraints I would use it with the SB12 passive membrane though (knowing that I exceed xmax on the PR before reaching xmax with the coaxial). But I'm curious what you think of the coaxial in general...
My box need "front panel" to raise baffle surface to level with top of rubber suspension. I have found with 5 and 6 inch models it makes responses much smoother. I have no motivation to measure angle responses before it. I made some crossover experiments to about 15 degree and it sounded pretty bad. This not ready and cant say how it sounds when ready.
I have also 4 inc paper version somewhere. Question for myself is are tweeter of paper version assembled deeper. SB shows quite different tweeter responses.
How about Rundlig on wall?
I have also 4 inc paper version somewhere. Question for myself is are tweeter of paper version assembled deeper. SB shows quite different tweeter responses.
How about Rundlig on wall?
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well, in my case the "baffle" would be a sphere - sort of a maxed-out rounding.
But it's good to know that it might be a good idea not only to flush-mount the driver basket, but maybe even mount it from behind the baffle, making the cutout just big enough that it exposes the suspension.
I've done that in the past with a flat baffle and a router, but routing the inside of a wooden bowl seems to be quite a challenge. 😀 Maybe that calls for an adapter ring that smoothes the transision between rubber surround and the baffle.
But it's good to know that it might be a good idea not only to flush-mount the driver basket, but maybe even mount it from behind the baffle, making the cutout just big enough that it exposes the suspension.
I've done that in the past with a flat baffle and a router, but routing the inside of a wooden bowl seems to be quite a challenge. 😀 Maybe that calls for an adapter ring that smoothes the transision between rubber surround and the baffle.
I saw that SB acoustic have just updated the paper on crossovers for the coaxial drivers, to include this one.
https://sbacoustics.com/technical-notes/
https://sbacoustics.com/technical-notes/
Thanks for reporting the find! Unfortunately, SB does not include measurements of any kind, although they state that the crossover design was optimized for 15deg listening angle (e.g. a bit off-axis). That seems to make sense, since most coaxial drivers seem to suffer from detrimential effects of cone+surround on their HF units, especially when measured on-axis. Sound power wise, these effects mostly average out when looking at the response for angles > 0deg.
The catch being any lack of information about the enclosure. So... what is the use of these crossovers?