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I recently acquired a set of Advent NV (New Vision) 250's from a friend of mine and I'm really impressed with the way they sound. The problem.... the woofers need to be re-foamed and they are sealed within the cabinet's. The only way I can get to them is to cut out the bottom of the cabinet's. They also have acrylic covers on the top and bottom of the cabinets. I found limited information on them, and from what I have read these Advents are extremely rare since they only released less than 200 pairs into this world. If anyone has any ideas that would be great. I do not want ruin the dynamics of the enclosure.
The Specs: http://audiokarma.org/forums/index.php?threads/advent-model-250-speakers-circa-1992.502305/
Edits: 07/22/16Follow Ups:
I have these speakers and have reformed internal woofer.
Turn speaker upside down
Slowly pry black plexiglass cover up from ear left or right. There is a postcard shaped piece of 2-sided foam adhesive holding plexiglass in place, just slowly progress your prying from left to right. Warming in sun first might help.
After removing plexiglass bottom cap, you will see actual cabinet bottom plate secured by Phillips screws. Remove screws leveling 2 a 1/4 way in to assist with lifting cap.
You will now need to remove port 'pipe'. Use razor blade scraper to to cut through hot glue like adhesive holding port in place, hot glue is only on side you can see. Slide port out trough front of speaker face.
Mark red dot side of speaker connection wire for reconnecting later approbiately. Remove 4 fastening screws and speaker wire.
Replace foam surround as you would in any other Advent 5.25" woofer. Note woofer cone is different than any other Advent 5.25" I have incountered as it uses a brass wire mesh imbedded in cone material making a very stiff and ridgid cone. Entire front of woofer cone is covered by flat paperboard cover, similar to Advent mini subwoofer. Use phone app freq generator to center woofer surround to metal cage during regluing process.
You may want to order replacement 1/4" chipboard (paper) 5.25" speaker "gasket" if you had trouble removing orginal in good condition. It provides spacing for foam surround to vibrate and move in the upfiring position into the upper 1/2 of the enclosure. Important function.
Reassemble in reverse order, use hot glue gun to secure port in place after reinserting completely.
Note: very similar to removal of 6.5" woofer in Advent New Vision 500 Series 3-way tower speaker (which I also own a pair of)
I completely retract the previous post. With re-foaming the mid and sub drivers the sound is unimaginably clear and crisp. The lows do lack luster since the woofer driver is completely enclosed inside the cabinet. I literally sounds if you were to put a driver in a closed box and the sound it would make. I want to just go over to it and open the cabinet to let the sound out but can't. So I have two Klipsch KWS-450's taking care of the low end. Someone posted that they are 100 watt continuous and 400 watts peak. Right now I have 150 rms running them with no issues at all. The only downfall is they seem very directional. I 'm use to my Bose 901's.Matt
Edits: 09/16/16
After removing the acrylic from the bottom of the cabinet I found 4 screws that attach the bottom wood section. When those were removed I was able to remove the bass driver for repairs. I'm very excited to hear what they sound like.
Thanks everyone!!
Matt
Instead of explaining this it is easier just to watch the tear down of one of them. The bass driver is enclosed in the cabinet. What you see in the pictures is just the mid range and tweeter.
https://www.youtube.com/watch?v=hf8EG0UzLKI
Thanks,
Matt
In your pic the woofers appear to be screwed on to the baffle board. Try removing those four screws, then user a flat screwdriver to prise the woofer out from whatever they used to seal it in place.
Or am I misunderstanding something?
WW
"A man need merely light the filaments of his receiving set and the world's greatest artists will perform for him." Alfred N. Goldsmith, RCA, 1922
The woofer visible to the front is the Midrange, unlike most Advent speakers, these are 3-way, and even more uncommon, the woofer for the bass is on the inside like in some sub-woofer.
That's what it looks like to me as well.
Maybe you can find some info here?http://www.classicspeakerpages.net/
Actually... looks like you can replace the woofer... it seems to be locked in with putty and you pry it out with a screwdriver as per instructions...http://www.classicspeakerpages.net/library/cizek/advent_loudspeaker/advent_loudspeaker_schemati/servicing_the_advent_loudsp.html#previous-photo
Love the internet. In 1980, that would have taken weeks. Now, one minute.
Edits: 07/20/16
my Speakerlab also needed re-foaming. For some reason, Speakerlab uses silicone adhesive when assembling in the factory
, making driver removal very difficult. I had someone do them that does it often and he had no trouble doing it with the drivers in the cabinets for $25 each. Well worth the $..
try taking out the rubber inserts that hold the grill on & see if there are any screws under them. Just a suggestion & the rubber inserts should pop in & out easily.
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