Hi there,
I've been searching and modeled in WinISD quite a few 8"-10"-12" subs recently.
The sub will be used with a 80w plate amp in a room approx 20-25 sq.m. The aim is to build a relatively compact sub (around 1 ft3 or lower) with possible room for improvement in the future like new plate amp and bigger enclosure. A 12" would need a bigger box so I'm sticking to a 10".
The Peerless XLS10 830452 got my attention, in a 1ft3 enclosure would have an F3 of 32hz. Ok performance considering how straightforward the build is. I'm aware that this driver was paired with a PR so probably missing out on that.
Would you give the green light for a XLS10 ported build or could you recommend another classic 10" driver? I'm based in the UK.
I've been searching and modeled in WinISD quite a few 8"-10"-12" subs recently.
The sub will be used with a 80w plate amp in a room approx 20-25 sq.m. The aim is to build a relatively compact sub (around 1 ft3 or lower) with possible room for improvement in the future like new plate amp and bigger enclosure. A 12" would need a bigger box so I'm sticking to a 10".
The Peerless XLS10 830452 got my attention, in a 1ft3 enclosure would have an F3 of 32hz. Ok performance considering how straightforward the build is. I'm aware that this driver was paired with a PR so probably missing out on that.
Would you give the green light for a XLS10 ported build or could you recommend another classic 10" driver? I'm based in the UK.
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How big/long does the port have to be to keep vent mach acceptable at xmax? I thought the xls drivers used PR's as the ports got so big for the small box volume.
Your port might end up as big as the box...
Rob.
Your port might end up as big as the box...
Rob.
If I choose a 1ft3 box, tuned at 30hz and 150w signal (rms limit for the xls10) a vent 2.5inch x 11inch gives me a 30m/s air velocity.
At 80watts which is max output of my current plate amp this goes down to 23m/s.
The enclosure could be 13x13x14 or similar like 12x12x15inch so should be fine fitting a 11inch back port
At 80watts which is max output of my current plate amp this goes down to 23m/s.
The enclosure could be 13x13x14 or similar like 12x12x15inch so should be fine fitting a 11inch back port
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What are you using to model?
With winISD I'm getting 30ms @80w on a 2.5" 325mm long vent.(1 cubic ft box) You need to be around 17ms or lower.
Rob.
With winISD I'm getting 30ms @80w on a 2.5" 325mm long vent.(1 cubic ft box) You need to be around 17ms or lower.
Rob.
Ha! I forgot to mention that in WinISD I added a subsonic filter as used in the plate amp. So I have a 3rd order highpass filter at 30hz. This brings the air velocity down @80W to 21m/s.
Ok, If you make your port 2.75" diameter you'll be just inside the recommended 17ms vent mach.
If it must be 2.5" look into some decent port flares for both ends.
Cheers,
Rob.
btw, my rooms about the same size as yours (20' x 10') I think you'll be a little under 'subbed' unless you listen fairly modestly / have terraced neighbours...
If it must be 2.5" look into some decent port flares for both ends.
Cheers,
Rob.
btw, my rooms about the same size as yours (20' x 10') I think you'll be a little under 'subbed' unless you listen fairly modestly / have terraced neighbours...
There is a good application note on the 830452.
http://www.tymphany.com/wordpress/wp-content/uploads/2018/10/Appnote-xlssub.pdf
For a passive radiator, the Scan Speak 26W/0-00 is a good replacement for the old Peerless version.
I only use a ø65 port in my 830452 40 litre HT subwoofer but it's flared at both ends using B&W Flowports, large on the inlet and massive on the outlet. Never heard any chuffing with movies.
http://www.tymphany.com/wordpress/wp-content/uploads/2018/10/Appnote-xlssub.pdf
For a passive radiator, the Scan Speak 26W/0-00 is a good replacement for the old Peerless version.
I only use a ø65 port in my 830452 40 litre HT subwoofer but it's flared at both ends using B&W Flowports, large on the inlet and massive on the outlet. Never heard any chuffing with movies.
Attachments
Doesnt that long port cause port resonance issues? Port resonance seems to be around 66 Hz.
Absolutely. The port resonance is 132Hz theoretical, and is visible in measurements at 111Hz. I have the crossover at 60Hz with mains, and brickwall the sub at around 100Hz anyway. Heavy lining can address the port resonance, but at the cost of port output loss.
Yeah, just simmed a single driver classic BR [Vb = Vas/1.44 tuned to Fs] out of curiosity and it required a ~ 4.8" dia. x 69.65" long vent with 1st notch at 100 Hz, so better overall IME to morph such alignments into a much better damped, ~ 4x larger inverse tapered TQWT.
GM
Hi GM, I wouldn't doubt what you're saying. I'm happy with the results though, my ported sub is heavily attenuated at around where the port resonance occurs. In future, I'm planning to change the peerless drivers for seas l26roy, debating whether to do a straight swap, or build another enclosure, that's a thread for another day. Cheers
Greets!
Wasn't critiquing your choice, just 'exposing' folks to an alternate way to deal with large/long vent tuned alignments. 😉 Folks can also simply add damping to 'taste' in the box/vent to get a similar response, though will roll off some of its bass whereas the TQWT's 'horn' loading offsets much of this loss, i.e. is under-damped by design.
GM
Wasn't critiquing your choice, just 'exposing' folks to an alternate way to deal with large/long vent tuned alignments. 😉 Folks can also simply add damping to 'taste' in the box/vent to get a similar response, though will roll off some of its bass whereas the TQWT's 'horn' loading offsets much of this loss, i.e. is under-damped by design.
GM