My Glass TB871 Build / Discussion

nukaidee · 28th March 2009, 06:16 AM

Hello All,

If any of you have been following all my random threads all over the place I finally found stuff I can work with. My matched drivers have arrived from Dave at Planet 10.. He ships fast and packages it really nicely.
Anyhow, I found a glass bottle at IKEA. It has a internal volume of 1.5L and the glass is slightly thicker than standard wine bottles. I am planning to stuff this with fibrefill and mount the drivers in the opening. It will be completely 100% sealed.

Now my questions are whether the slightly smaller internal volume would affect my sound quality / frequency response (I believe padded can reduce volume by 10%?) also, would epoxy be a good mounting glue or silicone be better?

Thanks for following. I'll post pics.. hopefully once I get everything in place.

planet10 · 28th March 2009, 07:15 AM

Glad to hear the drivers arrived.

The 1st 871S drivers i ever saw were mointed in 1 litre boxes... you might not get the most bass possible out of them, but they'll be fine, Stuffing can get you 10-30%, but too much will tend to degrade the sonics,

I wouldn't use anything to attach them that you can't somehow get them out. If you aren't going to affix a small baffle to screw the drivers in with, then silicon seal would be my 1st choice.

dave

nukaidee · 28th March 2009, 05:19 PM

alright, I think I'll go with the 1.5, lightly stuffed. Going to find a plastic / hard rubber baffle to fix it with.

nukaidee · 2nd April 2009, 08:54 PM

Alright, my glass tubes/bottles are ready at 1.8L, they're a little over the 1.66 vas of the drivers. I think I'll need a HPF at approx 80hz. what value of capacitor will I need?

thanks

Cal Weldon · 2nd April 2009, 09:15 PM

The Fs is 110 Hz no? That means your impedance is around 12-14 ohms at 80 Hz so about a 200 mfd cap for a first order. Are you sure you want it that low? Are you using the notch filter shown?

nukaidee · 2nd April 2009, 09:24 PM

wow. you're wayy over my head. no, no notch filter at this time, this is my really simple budget speaker =) maybe i'll add it in later if I feel I need it. I guess I could go a little higher at 95 or so, I just don't want to lose any of it.

planet10 · 2nd April 2009, 09:44 PM

Quote:

Originally posted by nukaidee
Alright, my glass tubes/bottles are ready at 1.8L, they're a little over the 1.66 vas of the drivers. I think I'll need a HPF at approx 80hz. what value of capacitor will I need?

Trying to do a passive at that frequency is very difficult as that is right near system resonance. Better to put a cap in front of the amplifier.

dave

badman · 2nd April 2009, 09:46 PM

Quote:

Originally posted by planet10

Trying to do a passive at that frequency is very difficult as that is right near system resonance. Better to put a cap in front of the amplifier.

dave

Seconded. Harrison labs sells some products for this if you want adjustable/removable.

nukaidee · 2nd April 2009, 09:47 PM

you mean put a cap in line with the input signal before the amp?

planet10 · 2nd April 2009, 09:50 PM

Quote:

Originally posted by nukaidee
you mean put a cap in line with the input signal before the amp?

Yes. I'd try it without 1st.

dave

28th March 2009, 06:16 AM	#1
nukaidee diyAudio Member Join Date: Nov 2008	My Glass TB871 Build / Discussion Hello All, If any of you have been following all my random threads all over the place I finally found stuff I can work with. My matched drivers have arrived from Dave at Planet 10.. He ships fast and packages it really nicely. Anyhow, I found a glass bottle at IKEA. It has a internal volume of 1.5L and the glass is slightly thicker than standard wine bottles. I am planning to stuff this with fibrefill and mount the drivers in the opening. It will be completely 100% sealed. Now my questions are whether the slightly smaller internal volume would affect my sound quality / frequency response (I believe padded can reduce volume by 10%?) also, would epoxy be a good mounting glue or silicone be better? Thanks for following. I'll post pics.. hopefully once I get everything in place.

28th March 2009, 07:15 AM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Glad to hear the drivers arrived. The 1st 871S drivers i ever saw were mointed in 1 litre boxes... you might not get the most bass possible out of them, but they'll be fine, Stuffing can get you 10-30%, but too much will tend to degrade the sonics, I wouldn't use anything to attach them that you can't somehow get them out. If you aren't going to affix a small baffle to screw the drivers in with, then silicon seal would be my 1st choice. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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28th March 2009, 05:19 PM	#3
nukaidee diyAudio Member Join Date: Nov 2008	alright, I think I'll go with the 1.5, lightly stuffed. Going to find a plastic / hard rubber baffle to fix it with.

2nd April 2009, 08:54 PM	#4
nukaidee diyAudio Member Join Date: Nov 2008	Alright, my glass tubes/bottles are ready at 1.8L, they're a little over the 1.66 vas of the drivers. I think I'll need a HPF at approx 80hz. what value of capacitor will I need? thanks

2nd April 2009, 09:24 PM	#6
nukaidee diyAudio Member Join Date: Nov 2008	wow. you're wayy over my head. no, no notch filter at this time, this is my really simple budget speaker =) maybe i'll add it in later if I feel I need it. I guess I could go a little higher at 95 or so, I just don't want to lose any of it.

2nd April 2009, 09:47 PM	#9
nukaidee diyAudio Member Join Date: Nov 2008	you mean put a cap in line with the input signal before the amp?

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