The 375L is the name of a famous Swiss car... 😎
... That I only have in miniature, unfortunately 🙁
Incidentally, it's the name that I choose for my loudspeaker enclosure project to come - because it's 3-way and 75L. with some Vintage style 🙂
The template :
The wood on the bench :
The start of the construction is scheduled for... Tomorrow 😀
A+!
... That I only have in miniature, unfortunately 🙁
Incidentally, it's the name that I choose for my loudspeaker enclosure project to come - because it's 3-way and 75L. with some Vintage style 🙂
The template :
The wood on the bench :
The start of the construction is scheduled for... Tomorrow 😀
A+!
Sounds interesting. Can you please provide details of the driver you are using and the crossover schematic?
Interesting to see how the Mid/tweeter crossover goes, crossing an 8” cone at 5khz is not a usual choice, usually nearer 2khz. The Beyma data sheet for the kids does not show off axis plots but usually they start to diverge around 2-3khz.
Looking forward to how it turns out and sounds.
Looking forward to how it turns out and sounds.
I'd be pleased if I had a true 375L - but with manual gear box !
On the 3 drivers, only the CP21/F is still on production today. Fortunately, I have a stock of 4x8M60N and 4x12B100R...
Yes, there's no indication about the off axis radiation of the 8M60N, but as its large dust dome is concave, it shouldn't be too bad, and my listening position can be 20° off axis, if required.
The CP21/F is FC-recommended at "5KHz or higher", so going lower may be not suitable...
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Thanks @TBTL
Those flowerpots are made from 4mm thick plastic resin for exterior use.
Available in DIY supermarkets, they exist in a good array of dimensions and moreover they are cheap... 😎
The 7.5L one is perfect for my midrange sealed enclosure here 😉.
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Those flowerpots are made from 4mm thick plastic resin for exterior use.
Available in DIY supermarkets, they exist in a good array of dimensions and moreover they are cheap... 😎
The 7.5L one is perfect for my midrange sealed enclosure here 😉.
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Work is on progress...
The glulam Beech wood "belt" is assembled and braced :
Next step : doing the routings on front and back panels :
Slowly the project will take shape (presented here with template) :
Wait and See...
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The glulam Beech wood "belt" is assembled and braced :
Next step : doing the routings on front and back panels :
Slowly the project will take shape (presented here with template) :
Wait and See...
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Looking really good so far! A friend had these CP21 crossed at 4.5kHz, no distortion measurements were made, but sounded good even in very loud sessions...
Thanks @peterbrorsson !
Yes, it is said that the CP21/F accept lower FC than 5KHz...
Beyma states :
Frequency range = 3.5-20KHz.
Recommended Xover = 5KHz or higher.
That said, there"s no mention of the FR so I'll measure it for the curiosity, but I think it is probably circa 3-4Khz, looking at the free air impedance curve.
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Yes, it is said that the CP21/F accept lower FC than 5KHz...
Or it's that we accept higher distortion if not seeing distortion measurements ;o)
That being said, I have improved my sound quality at home by being able to measure frequency response...
Or it's that we accept higher distortion if not seeing distortion measurements ;o)
That being said, I have improved my sound quality at home by being able to measure frequency response...
Yes, for sure !
In the past I had LspLAB for that purpose, but it's not compatible anymore with my current laptop. I replaced it with ARTA recently, but I never took the time yet to discover and set it up... Of course I will have to full enter it ! 🙄
I even have the plan to use an active variable 3-way Xover to listen the effect of changing quickly the crossing frequencies on the tone, the transducer distortion, the impulse and frequency response.
For the moment, the planned crossing frequencies are 500Hz and 5KHz, but the size of my midrange (8") and its sealed enclosure (7.5L) would allow me to go under 500Hz easily.
About the middle-treble frequency crossing, it's probably more difficult to move, due to the minimum requirement specified at 5KHz for the CP21/F.
Wait and See ! 😉
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Looks great so far. That gluelam is interesting. I've never seen it in stores. Doesn't look cheap!