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Anyone making Apogee bass panels ?
Anyone making Apogee bass panels ?
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Old 22nd August 2020, 06:58 PM   #251
AVWERK is online now AVWERK  United States
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These went well and the new chassis is coming around next.

Regards
David
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Old 25th August 2020, 10:21 PM   #252
narkotic is offline narkotic  United States
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Nice work David!
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Old 26th August 2020, 10:56 PM   #253
AVWERK is online now AVWERK  United States
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Thanx Pete. The reason yours had these ripples is sections pulled loose .
I was able to pull both speaker foils from the silicone without damaging either one.

Perhaps the installer (2008) assumed new foils were already clean before applying silicone and maybe
a good cleaning with acetone would have gotten them further along

I shouldn’t have been able to peel these free so easily.
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Old 26th August 2020, 11:23 PM   #254
narkotic is offline narkotic  United States
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What a shame. Glad they're in more capable hands now then.
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Old 27th August 2020, 09:01 AM   #255
RedAlert59 is offline RedAlert59  Finland
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Did I understood it right, you managed loosen old foils intact? And made new ones from scratch? GREAT JOB!
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Old 15th September 2020, 11:56 PM   #256
AVWERK is online now AVWERK  United States
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Thinking about this for those with decent panels but bad foam and the possibility of removing them intact to be reused , reformed and reglued again , I was able to remove the Diva panels and also the Graz Scintilla panels rather easily.

Important points would be to take your time , have a spare room with at least a 3 X 7 foot table with saw horses, no pets or birds to land on your panels and no kids to get into the area.

With the idea that if this doesn’t work and you destroy a panel , at least panels are available posted by artm in pg #233 which is fantastic news and decent prices
for those wanting to diy
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Old 21st September 2020, 07:48 PM   #257
Blues ea is offline Blues ea  Finland
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Hey. I planned the construction of the bass panel.
I have already done mid panels and a tweeters.
My question would be as follows. Or there may be more than one.
Apogen panels are very low ohmic.
Is the reason for this that the availability of higher power magnets at that time has been poor. I assume that apogee has used ferrite magnets.
my purpose would be to build panels with neodymium magnets.
to be able to make the panels a little amplifier friendly.
and more sensitive. Has anyone tried any of these.
how far apart those apogen magnets are. I assume the magnets are 20x50x10mm. how large is the apogen largest panel. height, width at bottom, width at top.
how long is one magnet line. I assume the width at the bottom is about 40cm and the magnets 25cm. how thick is the perforated plate behind the magnets. and how big the holes are in it.
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Old 22nd September 2020, 01:29 PM   #258
RogerGustavsson is offline RogerGustavsson  Sweden
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The price of neodymium is about ten times the price of ferrites of the same size. The drivers use to be about 25 cm at the top and 35 cm at the bottom. In the eighties people used 40x25x10 mm ferrites in copies of the Apogee. I think there is a delicate balance between the magnetic field strength, the impedance of the conductor on the diaphragm and the bass response. If the magnetic field strength is too large, maybe the neccessary peak (large Q) in the bass weakens?
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Old 22nd September 2020, 03:15 PM   #259
AVWERK is online now AVWERK  United States
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The Diva as an example is an easy speaker to drive with no serious phase angles to worry about although those flea watt tube amps need not apply if that’s what you mean..,

The magnet size on the Diva is 2.530” X .806” X .450” thick (174 magnets per speaker)
Top to bottom Ctr. To Ctr. Spacing is 64 1/4”

The Scintilla (1 ohm) on the other hand will make your amps cry for mommy

I am in the process of keeping the original crossover along with a biamp capability by adding outside foils in series to bring both bass and mid to 2 ohms as the class D amps current limit at 1 ohm but not 2. The stock mid has a .9 ohm
foil in series to bring it up to the bass panels

The Scintilla magnets are 1 7/8” X 7/8” X 7/16” thick
Top to bottom Ctr. To Ctr. is 49 13/16” with 1/2” spacing
nobody will be diying this speaker any time soon

The perforated steel of both the Diva/ Scintilla is .100” thick and not certain of the open area percentage.

A neo version of a Scintilla would be nice and believe Graz has extremely expensive versions with neo magnets if flea power is your thing, although class D
is now cheap so why build an expensive neo speaker ?

Regards
David

Last edited by AVWERK; 22nd September 2020 at 03:35 PM. Reason: .
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Old 23rd September 2020, 12:21 PM   #260
RogerGustavsson is offline RogerGustavsson  Sweden
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Here, I can see 204 magnets on each bass driver of the Diva.

Apogee Diva – Inside Pictures | HFA - The Independent Source for Audio Equipment Reviews
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