[flash]

this is one that was requested by many of you - i wanted to give it a try, and an opportunity came up as a result of a mishap that prevented us from doing the job scheduled for the day - so, we made lemonade

the result was a very nice sounding "box" - the final result depends on the speaker you choose, but the box sounds good - very easy and inexpensive too

REAR_SPEAKER_CHAMBER_SEAL.doc__Preview_.pdf Size: 1.34 MB  Downloads: 235

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[Jamie '92 968]

Wow, that was fast.

Great idea and great write-up
Thanks!

How many cubic feet do you think there are in the resulting enclosure?

Also, what do you think about the potential for moisture to get trapped somewhere around the foam?
Are there any drain holes I should be careful of not closing?

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[flash]

lol - thanks

i would guess about .3 cu ft

any drain holes should still work - water magically finds its way down

condensation should not be a problem - it's pretty sealed up, and that small of an area should stay clear of that - obviously won't know for sure for a while yet, but i'm really not worried about it

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[madridcab]

Flash, nice write up. What about for a cab, when I opened up to take a look, the speaker is kind of sitting in "open air", no chance of any low frequencies..?

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[flash]

no can do on a cab - the mechanism makes it impossible to seal up that area

the best bet is to source out the OEM boxed speaker setup (they did both 1 and 2 speaker version), or to order the slim version of the foam enclosures from crutchfield

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[PorscheDude]

Nice work Flash!
I am going to do this when I fix my rear amp wiring.

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[rxter]

<!--quoteo(post=68011:date=Mar 4 2009, 08:45 AM:name=madridcab)-->QUOTE (madridcab @ Mar 4 2009, 08:45 AM) <{POST_SNAPBACK}><!--quotec-->Flash, nice write up. What about for a cab, when I opened up to take a look, the speaker is kind of sitting in "open air", no chance of any low frequencies..?<!--QuoteEnd--><!--QuoteEEnd-->

We used a little foam cup thingy behind the rear speakers in the cab. They helped with the sound, but interfere with seat belt operation. 10 minutes with a pair of scissors and some gaffer's tape will allow you to trim them down enough to allow the seat belts to move by freely. Sorry I did not take any pictures (what was I thinking??)

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[94SilverCab]

Yeah, I bet you're just a shill for the aluminum dryer hose manufacturers...probably on the board of directors of Alcoa...oops sorry, wrong site.

Please continue...

Jay

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[flash]

they interfered with the seat belt? how? i had the same ones in my car, and in the white car - no issues - ring me up - i want to hear more about that

jay - funny guy

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[rxter]

<!--quoteo(post=68045:date=Mar 4 2009, 04:06 PM:name=flash)-->QUOTE (flash @ Mar 4 2009, 04:06 PM) <{POST_SNAPBACK}><!--quotec-->they interfered with the seat belt? how? i had the same ones in my car, and in the white car - no issues - ring me up - i want to hear more about that

jay - funny guy<!--QuoteEnd--><!--QuoteEEnd-->


Just rubbed on the back a bit. Was about 1/2" too thick. Easy to mod. I'll show you on tech day.

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[flash]

i am hoping you didn't open up the chamber - that would pretty much defeat the purpose - but, the plastic upper half is the same dimension, and didn't interfere, so i'm thinking it was a problem with the belt and not the enclosure - but, as you say, i'll see it on tech day

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[rxter]

Same dimensionally but not as thick, and smoother material. I did open it up, and then closed it back down. A compromise on the sound quality to be sure, but the belts get precedence.

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[flash]

yeah - i'm gonna have to look at that - there should not have been a problem - didn't those enclosures come from me? if so, i had them in 2 different cars with no snagging of the belts - however, if you ordered the full depth ones, and not the slim ones, then i understand the problem

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[Jamie '92 968]

Flash,

What do you think about the idea of adding a port to the enclosure?
I've never read a good how-to on enclosure design, and am still unclear about how an enclosure helps bass response, not to mention the extra complexity of a ported enclosure.
From a practical standpoint, a port would add some ventilation to the enclosure (yea... the moisture question again. If I lived in So Cal, I wouldn't worry either).
How does a port improve bass response?

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[flash]

nope - that would only work with a much more solid baffle plate - a port makes the box "think" it's bigger - not necessary with a 6 or 6.5 - if you were going to try to figure out how to stuff an 8 in there, sure, but that is a whole different oprah

nope - that would only work with a much more solid baffle plate - a port makes the box "think" it's bigger - not necessary with a 6 or 6.5 - if you were going to try to figure out how to stuff an 8 in there, sure, but that is a whole different oprah

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[DaveN]

I'm doing this mod on the weekend but I have one concern still. The speaker grill is only about 1/2 the size of the actual drivers beneath. The mod will create better bass but to improve the mid/treble shouldn't the grill be enlarged to expose the whole speaker? I have the basic system so there is only a coaxial in the back and no separate tweeter.

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[flash]

that is a compromise for sure, but no more than the OEM speakers - it all depends on how much high end you want and how wiling you are to cut into the panels to get it

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[DaveN]

That's the big problem, I don't really want to deface my virgin panels lest I screw up and have to find a used one [img]style_emoticons/<#EMO_DIR#>/wink.gif[/img] Not to mention my son who would scream at me for weeks; I put a finger nail marks on the steering wheel leather once and he nagged me for days about not taking care of the car!

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[flash]

it won't be any worse than it was before - if it bugged you before, it still will - no clue how to advise otherwise

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