I am wondering if I will use this woofer to augment the bass in my OB design. The chassis shares the same dimensions and it has a lower FS. I am thinking of running a 1.5 way with the FR and this woofer doing bass duty below, say, 150hz.
Omega speaker systems use a similar principle in the high output versions of their speakers - the FR runs full range and the woofer has a filter at 200hz.
👍 same idea with a different 8" FR + 12" bass drivers in a smallish barrel baffle.
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@Plott Keep in mind that your tweeter might sound different when you later mount it on the baffle. Have a watch of this guy talking about tweeter/baffle response effects. Maybe with your very different tweeter than his and having a wave guide the effect will be less.
interesting and cheap product you can use under the front/feet to tile them back
https://www.supplyhouse.com/DiversiTech-MP-3C-Rubber-Cork-Anti-Vibration-Pad-3-x-3-x-7-8
Okay... it seems to be not too bad to my ears, but the measurement shows a different picture; measured at listening height and on my listening place, on axis. A lot to do...
Yes, but no, but... as a further result of the measurement I know now, that the acoustics of my living room is bad... I have a strong whip-like echo in the midrange. The dip in the midrange on the graph can also be the result of cancellation. So much fun... 😀 So just ordered some sets of diffusers and absorbers...
I have height-adjustible feets under the speaker, thanks. They allow to tilt about 4 cm backwards.
That's not much. I would think you'd need at least 5 to 10 degrees to make any difference.
It depends on where the third feet is 😀 (distance between front and rear)
With 3 cm now the speakers are tilted 4 degrees.
I’m pretty tempted to get a pair of the SB full range drivers but was wondering what the beaming is like. Could anyone pass on their subjective findings?
I did have a pair of the Fane 12” wide range drivers but found the sweet spot was very tight.
Cheers,
SS
I did have a pair of the Fane 12” wide range drivers but found the sweet spot was very tight.
Cheers,
SS
Pro style 12" driver with Mms of over 50 grams and a highly tilted up (bright?) high end versus the 16 grams SB 8" driver. Completely diff beasts.
That said, lets hear what people say about the beaming subject.
You can always test outside but that quickly gets old if you will be testing/measuring more than a few times.
But if it tests bad outside then you don't have to spend money on room treatments just yet.
I think, room treatment is one of the most important things of all. No matter how good the system is, if reflections, echoes and cancellations destroy everything. Measurement is not everything, because you measure your room too. Just my two cents 🙂
Has anyone experience of a Rolls SX 95 stereo subwoofer crossover? When I get around to ordering the 8 inch SB woofers as mentioned above I thought about running them ‘actively’ either with a plate amp of the SX95 into a stereo amplifier/power amplifier. The details can be found here.
https://rolls.com/product/SX95
It is essentially a line-level LPF between 36 - 200hz, 12db slope with stereo output and switchable phase for each channel.
In the short term I will run one of my cheap Chinese sub amps but thought this might be a better mid/long term solution.
https://rolls.com/product/SX95
It is essentially a line-level LPF between 36 - 200hz, 12db slope with stereo output and switchable phase for each channel.
In the short term I will run one of my cheap Chinese sub amps but thought this might be a better mid/long term solution.
Hello,
I would like to try this SB Acoustics SB20FRPC30-8 full-range speaker but I have no experience in building speaker enclosures and because of the lack of space I would like to try a smaller and cheaper enclosure than the one presented in this forum tread, for example, similar to this cabinet plan:
![Fenlon-120Alp[1].png](https://www.diyaudio.com/community/attachments/fenlon-120alp-1-png.1114993/ "Fenlon-120Alp[1].png")
Does anyone know if this cabinet is appropriate for the SB Acoustics SB20FRPC30-8 full-range speakers?
I would like to try this SB Acoustics SB20FRPC30-8 full-range speaker but I have no experience in building speaker enclosures and because of the lack of space I would like to try a smaller and cheaper enclosure than the one presented in this forum tread, for example, similar to this cabinet plan:
Does anyone know if this cabinet is appropriate for the SB Acoustics SB20FRPC30-8 full-range speakers?
Try with WinISD.
SB20FRPC30-8 doesn't work so well in such small boxes. 100 liters is optimal volume in a BR box.
In a closed box, 27 liters is optimal volume.
Vas does not determine everything for a suitable volume.
WinISD recommends a volume of 100 liters for a bass reflex box. Should be able to provide a bass down to 31hz -3db.
If you use 66 liters 38hz -3db.
50 liters 45hz -3db
40 liters 50hz -3db
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