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Old 11-23-2010, 02:19 AM   #1
derickveliz2
 
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Exclamation I was wondering about the small HL-70 Hertz 3"(mids) in the spheres...

.

If there are 2 types of speakers characteristics:

-Free Air (no need of enclosure just a baffle)
-Enclosure specific (XX cubic feet of internal volume)

So I asked my self?... is the internal volume of the spheres enough for the HL-70 to perform properly?

I email Hertz and they told me it's a Free Air driver and for my application I need at least 1 Liter = 61.0237 in³ of internal volume. According to my math a 5" sphere is about 65 in³ so I should be OK, but "NO" I measured the spheres and real dimensions have a 4.5" diameter less the sides I cut short to match the a-pillars... I did a water test to find out the internal volume and it's a little under 1/2 liter.

I guess I'm going to have to open a second hole into the A-pillars to vent the enclosure for proper driver performance. Also will use some Poly Fill.

.
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Old 11-23-2010, 12:25 PM   #2
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Old 11-23-2010, 05:38 PM   #3
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Quote:
Originally Posted by sqcomp View Post
...You didn't know this BEFORE? *smack*
I kind of knew, but never realized on the effects on such a small driver and how it will play lower frequencies from 200 Hz to 14k Hz. The Spheres as sealed enclosures could affect it's performance, but if I open them into the a-pillar I won't have a problem.
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Old 11-25-2010, 02:46 AM   #4
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Wink

Here is a little bit more work on the spheres...

What I thought it would be flat black came out brown, ...

Any way at the end I may end up "FLOCKING" the spheres and the a-pillars, SQ, Palmer or any body else... do you know how to do it? I've been searching online and can't find a DIY

Spheres with primer and some spray paint:









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Old 11-25-2010, 03:41 AM   #5
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Exclamation

.

I found this Site with Flocking materials...


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Old 11-26-2010, 12:43 AM   #6
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Arrow

I brought the spheres up stairs, for my wife to see... she surprised me and said..."They look pretty good"

So for now they are going to live like that, maybe add some soft texture and a flat black look; then after everything is installed I'll think about flocking or not.

I have to get smaller Threaded Inserts to hold the HL-70s to the spheres, the ones I got are a tad too big.

AM... save the best for last!

.
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Old 11-26-2010, 12:55 AM   #7
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HAPPY TURKEY DAY EVERY BODY!
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Old 11-26-2010, 02:27 AM   #8
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Black looks much better!



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Old 11-26-2010, 03:12 PM   #9
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:thum bup:: thumbup:its just too sick how they look great
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Old 11-29-2010, 03:46 AM   #10
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Smile

After celebrating turkey day in New Hampshire and a long weekend with Family and Friends, we are back and here I am trying to install the "threaded inserts" I wish they make smaller ones for my 3" speakers, it has to be precises or it won't work, not a lot of space to play with.

Finally at the end looks good and they work great!






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Old 11-29-2010, 03:48 AM   #11
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Question

Sqcomp...

what does "glassing with a racketball" means?


D.
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Old 11-29-2010, 03:53 AM   #12
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Wink

.
Next step...

Open a second hole into to the spheres to let the Mids breath!

The opening would be a little bit bigger than the red mark, and then I'll match it in the A-pillar, and will seal the edges with Butyl Rope to help with vibrations and acoustics.



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Old 12-01-2010, 02:20 AM   #13
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Left a-pillar is ready for speaker + wires, I'm letting the HL-70s breath through the a-pillar, I added some peaces of CLD-Tiles inside the sphere and behind the a-pillar, I will cover the CLD-Tiles behind the a-pillar with CCFoam, I also got a layer of CCFoam between the sphere and the a-pillar.

Feels very solid, we'll see how it works and if it needs more dampening material...





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Old 12-01-2010, 12:34 PM   #14
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Here is the video:

LINK


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Old 12-01-2010, 03:08 PM   #15
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I'm getting 16 sq feet of MLV, 10 sq feet have Pressure Sensitive Adhesive, we'll see how it works...LINK to MLV

By the way forgot to mention that the amp and sub are here!
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Old 12-01-2010, 04:35 PM   #16
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I had to peak in one of the boxes... IDQ12's are AWESOME!
The pictures I've seen online don't make justice to such a beautiful beast.
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Old 12-02-2010, 02:59 AM   #17
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One of each!









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Old 12-02-2010, 03:45 AM   #18
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Derick, those are some really nice electroacoustic transducers you got there!

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