I only turn the speakers if the treble feels too strong. Toe in and out. It is not more difficult. I know some people love to measure everything. I love to listen. Because that is what is most important to me.
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um, he said
"I only turn up the speakers if the treble feels too strong. It is not more difficult. I know some people love to measure everything. I love to listen. Because that's what's essentially the bottom line."
at least according to google translate.....................................
"I only turn up the speakers if the treble feels too strong. It is not more difficult. I know some people love to measure everything. I love to listen. Because that's what's essentially the bottom line."
at least according to google translate.....................................
Could be worse. You should see the junk masquarading as an assignment I was recently asked to look over. Yes, almost entirely generated by ChatGPT.
Automatic fail. Both in terms of a submission, and for the pitiful content.
Re the paucity of more extensive / higher resolution measurements published by MA, how about a GFM campaign to fund a full zoot Klippel near field measurement rig for the boys on the band? 😎
Or just send them to Erin?
Or just send them to Erin?
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http://wodendesign.com/downloads/Quadrapole-P11-MLTL.pdf
I think the onky thng not right i think this is good.
https://frugal-phile.com/boxlib/woden/MtnX-QuadSHN110-MLTL-0v81-010323.pdf
https://frugal-phile.com/boxlib/woden/Compact-P7HD-A7ms-bi-quadra-pole-0v81-90320.pdf
dave
I think the onky thng not right i think this is good.
https://frugal-phile.com/boxlib/woden/MtnX-QuadSHN110-MLTL-0v81-010323.pdf
https://frugal-phile.com/boxlib/woden/Compact-P7HD-A7ms-bi-quadra-pole-0v81-90320.pdf
dave
Sigh, unfortunately I don’t have the room for that. My wife would push them against the wall. Maybe, I don’t have the wife for those speakers? 😁
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Nice!
@Scottmoose (or anyone else who can help) I'm reading up on MLTL boxes at the moment, trying to get my head around them. I've not been brave enough to try modelling in Hornresp yet, but I will try that soon. When I model the Mauna Kea as a vented box in Basta, it has a 2 dB peak at about 39 Hz, caused by the vent tuning, with a dip around 60 Hz. Obviously, Basta is not taking account of the quarter-wave resonance, which ought to be at around 60 Hz, I think. Would you expect that quarter-wave resonance to 'fill in' the dip around 60 Hz, giving a balanced result? Or am I on the wrong track?
(The pdf mentions the longitudinal resonance providing vent damping. I'm not sure if that's another way of saying it fills in the dip. Or does the quarter-wave resonance do a bit of both, suppressing the peak, and filling in the dip? Or am I just barking up the wrong tree?)
@Scottmoose (or anyone else who can help) I'm reading up on MLTL boxes at the moment, trying to get my head around them. I've not been brave enough to try modelling in Hornresp yet, but I will try that soon. When I model the Mauna Kea as a vented box in Basta, it has a 2 dB peak at about 39 Hz, caused by the vent tuning, with a dip around 60 Hz. Obviously, Basta is not taking account of the quarter-wave resonance, which ought to be at around 60 Hz, I think. Would you expect that quarter-wave resonance to 'fill in' the dip around 60 Hz, giving a balanced result? Or am I on the wrong track?
(The pdf mentions the longitudinal resonance providing vent damping. I'm not sure if that's another way of saying it fills in the dip. Or does the quarter-wave resonance do a bit of both, suppressing the peak, and filling in the dip? Or am I just barking up the wrong tree?)
Good question.
A lumped element modeller based on Helmholtz assumptions can't model these enclosures accurately, so if you try based purely off Vb and Fb, you'll get some significant variations like you describe. Depending on the software assumptions, most usually Qa and Ql, you'll either find the vent dimensions are off relative to what's specified, or if you enter those as-described, then Fb rises by about 6Hz - 7Hz with a peaking alignment compared to the mildly damped response it has in practice (there shouldn't be any significant issue around 60Hz even under Helmholtz though, so I'm not sure off-hand what Basta is doing -if I get chance I'll try to track that down out of interest later). That last is caused by the longitudinal mode damping the vent output -Mauna Kea is closer to being a 'real' MLTL in this sense than most shorter, more highly forced types. Not entirely, but closer.
A lumped element modeller based on Helmholtz assumptions can't model these enclosures accurately, so if you try based purely off Vb and Fb, you'll get some significant variations like you describe. Depending on the software assumptions, most usually Qa and Ql, you'll either find the vent dimensions are off relative to what's specified, or if you enter those as-described, then Fb rises by about 6Hz - 7Hz with a peaking alignment compared to the mildly damped response it has in practice (there shouldn't be any significant issue around 60Hz even under Helmholtz though, so I'm not sure off-hand what Basta is doing -if I get chance I'll try to track that down out of interest later). That last is caused by the longitudinal mode damping the vent output -Mauna Kea is closer to being a 'real' MLTL in this sense than most shorter, more highly forced types. Not entirely, but closer.
Approaching FHXL’s extention (with the appropriate driver).
Scott (@Scottmoose) will MA200 fit Joan?
dave
Thanks for your reply. I don't think Basta has any way of setting values for Qa and Ql, unfortunately, just a Qb (box Q) setting on the box tab, with a default value of 20, and a Qp setting for the vent, also with 20 as default. (Maybe Qb is an amalgam of Qa and Ql? Or is it just Qa under another name, and Qp the same as Ql?) I can certainly get rid of the peak at 39 Hz by lowering either of those (to about 5), but that feels more like cheating than actually modelling.
I guess my idea of using Basta as a shortcut wasn't too smart - it's just not what it's designed for.
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Give me twelve (about to sleep the sleep of the unjust) to check, but off the top of my head, yes, it should.
I don't see any driver bass bump in the frequency response.
10" wide baffle pencil, theoretical f3 of 450hz (4560/width, although baffle step can be approximately 3db-6db).
Anyone shoot from the hip for a baffle step circuit ?
from xrk971 post 28
https://www.diyaudio.com/community/threads/baffle-step-compensation-circuit-for-bookshelf-speaker.373969/page-2
"For 8ohm speakers in typical 8in to 10in wide baffles, my go-to standard starting point is a 1mH coil and about 4.7ohms 10w in parallel. That can be added to the outside of the speaker using Wago connectors and adjust the resistor to taste. For more bass, use 6.8ohm, for more sparkle use 3.3ohm etc. adjust to taste. Either air core or iron core can work here. Sometimes I have used 0.8mH or even 0.68mH of you want to move the beginning of the shelf up higher. For 1mH it’s around 800Hz to 900Hz. Just try it and you will hear a difference immediately."
10" wide baffle pencil, theoretical f3 of 450hz (4560/width, although baffle step can be approximately 3db-6db).
Anyone shoot from the hip for a baffle step circuit ?
from xrk971 post 28
https://www.diyaudio.com/community/threads/baffle-step-compensation-circuit-for-bookshelf-speaker.373969/page-2
"For 8ohm speakers in typical 8in to 10in wide baffles, my go-to standard starting point is a 1mH coil and about 4.7ohms 10w in parallel. That can be added to the outside of the speaker using Wago connectors and adjust the resistor to taste. For more bass, use 6.8ohm, for more sparkle use 3.3ohm etc. adjust to taste. Either air core or iron core can work here. Sometimes I have used 0.8mH or even 0.68mH of you want to move the beginning of the shelf up higher. For 1mH it’s around 800Hz to 900Hz. Just try it and you will hear a difference immediately."
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