Fast, fun, Inexpensive OB project - Page 179

scottjoplin · 29th March 2018, 10:11 PM

The wings will certainly help with the bracing but I think it'd be better if they didn't impede the wideband so much to the front

John Busch · 29th March 2018, 10:27 PM

Johno.... The plastic Chevy post was a test.... having some operator difficulties at this end.... I SURE it's not MY fault... Anyway, nice that you like it. Moma's car actually... as with you, getting in and out of it is a real pain in the....

John Busch · 29th March 2018, 10:31 PM

Johno... almost forgot.... well I did forget... the wings will help some with the Peerless, but with it's lower Q, not as much as with the GRS 15. You would see a bit of efficiency gain which may require some pad and High Pass capacitor adjustments. If you do experiment, would be interesting to know what you find out.

John Busch · 29th March 2018, 10:35 PM

SJ The wing depth(s) I ended up with is based on quite a bit of experimentation, and listening. Once I went beyond the 2.5" up front and the 5" in back, I could start hearing changes. Not all bad BTW, but away from the original concept clarity and balance. So I think I got about as much "free" improvements as I could without messing up what the Manzanita does well.

scottjoplin · 29th March 2018, 10:41 PM

Yes, it's tempting to go towards H frame or U frame for more bass (I have U frames) but I find the idea of the flat baffle pure, I managed to convince myself that for bass, and so long as you crossover below cavity resonance, wings or frames don't degrade the dipole behaviour too much.

jwjarch · 30th March 2018, 12:00 AM

Hi John,
Does "free" improvements also mean no changes to the crossover as currently designed?

John Busch · 30th March 2018, 03:02 PM

Free refers to construction costs remaining basically the same, save the extra "sweat" equity. The crossover will require some adjustments... lower pad resistor value and tweaking the high pass cap value upward a couple of MFD. As in the past, adjust to suit your taste, specific driver realities and room conditions. Nice thing about adjusting the cap is you can just add a bit at a time parallel to the existing cap. 0.5 MFD increments once or twice than how many 0.1 it takes until the sound snaps into place.

Can't give you an exact Pad resistor value change. Don't know where you are now and the Vifa and GRS can vary a bit. All that adds up. Suspect most would see a 1-3 ohm drop in the pad value.

I encourage you experiment with temporary card board wings and see if you like what you hear. Good luck!

29th March 2018, 10:11 PM	#1781
scottjoplin diyAudio Member Join Date: Dec 2015 Location: Penrhyndeudraeth	The wings will certainly help with the bracing but I think it'd be better if they didn't impede the wideband so much to the front __________________ Woofer Assisted Wideband is the New Testament renounce the anachronistic acronym FAST

29th March 2018, 10:27 PM	#1782
John Busch diyAudio Member Join Date: Oct 2007 Location: Hill country, Texas	Johno.... The plastic Chevy post was a test.... having some operator difficulties at this end.... I SURE it's not MY fault... Anyway, nice that you like it. Moma's car actually... as with you, getting in and out of it is a real pain in the.... __________________ Commercial Website: http://www.manzanitaaudiosolutions.com/index.html

29th March 2018, 10:31 PM	#1783
John Busch diyAudio Member Join Date: Oct 2007 Location: Hill country, Texas	Johno... almost forgot.... well I did forget... the wings will help some with the Peerless, but with it's lower Q, not as much as with the GRS 15. You would see a bit of efficiency gain which may require some pad and High Pass capacitor adjustments. If you do experiment, would be interesting to know what you find out. __________________ Commercial Website: http://www.manzanitaaudiosolutions.com/index.html

29th March 2018, 10:35 PM	#1784
John Busch diyAudio Member Join Date: Oct 2007 Location: Hill country, Texas	SJ The wing depth(s) I ended up with is based on quite a bit of experimentation, and listening. Once I went beyond the 2.5" up front and the 5" in back, I could start hearing changes. Not all bad BTW, but away from the original concept clarity and balance. So I think I got about as much "free" improvements as I could without messing up what the Manzanita does well. __________________ Commercial Website: http://www.manzanitaaudiosolutions.com/index.html

29th March 2018, 10:41 PM	#1785
scottjoplin diyAudio Member Join Date: Dec 2015 Location: Penrhyndeudraeth	Yes, it's tempting to go towards H frame or U frame for more bass (I have U frames) but I find the idea of the flat baffle pure, I managed to convince myself that for bass, and so long as you crossover below cavity resonance, wings or frames don't degrade the dipole behaviour too much. __________________ Woofer Assisted Wideband is the New Testament renounce the anachronistic acronym FAST


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30th March 2018, 12:00 AM	#1786
jwjarch diyAudio Member Join Date: Mar 2017 Location: San Leandro, CA	Hi John, Does "free" improvements also mean no changes to the crossover as currently designed?

30th March 2018, 03:02 PM	#1787
John Busch diyAudio Member Join Date: Oct 2007 Location: Hill country, Texas	Free refers to construction costs remaining basically the same, save the extra "sweat" equity. The crossover will require some adjustments... lower pad resistor value and tweaking the high pass cap value upward a couple of MFD. As in the past, adjust to suit your taste, specific driver realities and room conditions. Nice thing about adjusting the cap is you can just add a bit at a time parallel to the existing cap. 0.5 MFD increments once or twice than how many 0.1 it takes until the sound snaps into place. Can't give you an exact Pad resistor value change. Don't know where you are now and the Vifa and GRS can vary a bit. All that adds up. Suspect most would see a 1-3 ohm drop in the pad value. I encourage you experiment with temporary card board wings and see if you like what you hear. Good luck! __________________ Commercial Website: http://www.manzanitaaudiosolutions.com/index.html

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