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Old 23rd September 2002, 05:36 AM   #11
navin is offline navin  India
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jcarr:
Similar in concept, yes, but for maximum total stiffness, you really want high tensile strength from the laminate and a good amount of distance (cross-section) between the laminate layers. Still, plastic laminate is probably better than nothing.

Dave, where do a find an answer to my fiberglass question in this?

Should I even mess with fiberglass or should I "forgedaboudit".

Thanks.
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Old 23rd September 2002, 06:59 AM   #12
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My purpose in sending you to that comment was to encourage you to try the fiberglass layer.

Did you just see that movie?

dave
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Old 23rd September 2002, 11:09 AM   #13
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what movie?
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Old 23rd September 2002, 04:20 PM   #14
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Quote:
Originally posted by navin
what movie?
"forgedaboudit"

made famous by the movie Hugh Grant as the auction house guy turned fake mofia guy because he had fallen in love with the mafiosa daughter (can't remember the movies name)

dave
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Old 25th September 2002, 03:09 PM   #15
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Ok guys, you can laugh a bit on me...

Let say, my box volume is x litre.

Bracing takes a part of the box volume
Port takes a part of the box volume
Speaker cone, magnet, etc take part of the box volume.
To be more crazy: wires and crossover take part of the box volume ( ).

Port volume is easy to compute: V=pi*r^2*h
Bracing volume is more complex but still possible.
Finally, the most difficult thing is evaluating or computing the volume of the speaker. Do you have any idea how to do that except putting the back of the speaker in the water?

Usually, I don't take these variables into account, but this time I want to be exact (this is my engineer side that is talking).

thanks
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Old 28th September 2002, 06:12 PM   #16
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you really want to know...
dump all of the above in a plastic bag. dump plastic bag into bucket full to brim of water. measure water displaced.
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Old 28th September 2002, 06:13 PM   #17
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yeah saw that movie but when i was in brooklyn (1982-1986) we used "forgedaboudit" all the time.
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Old 1st October 2002, 01:52 AM   #18
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Default Still me...

Hey guys, I found two drivers: Peerless 850100 and Peerless 850102. Both seems very similar but the '100 give me a better frequency response. The '100 give me also a 8.9 litre box so I am a little bit suspicious for a 4.5 inches driver. What are your opinions about this simulation? Do you think the '100 is too nice to be true (48.5Hz@-3dB for the '100 compared to 66.3Hz@-3db for the '102) ?

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Old 1st October 2002, 03:56 AM   #19
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Default Re: Still me...

It may well go that low at low signal levels, but will be excursion limited pretty early.

That the driver with the higher Fs, and with a Q more suited to an ML-TQWT is the one that goes lower in a vented box i find kind of fishy.

Does it give up something at the top of its range to go so low?

dave
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Old 1st October 2002, 06:59 AM   #20
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I'd prefer the 102 because...

lower Fs
higher Bl (I assume the Mms of both is the same)

Dave is right about Qts too. very high Qts is not too good.
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