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My thinking is that it might be there to secure the foam blocks in place, but its only a guess. They indeed do have a brace inside not found on the A series. Hell, that’s half the ‘fun’ and accomplishment 'kudos' of refoaming….! It's a thankless job and I don't think a 'pro' can make any money at it and go to all that trouble for say $50. That’s a real lazy way to do it, as the woofers should be taken out for the best job and resealed as well. And where they let all the old black foam pieces just fall on the original insulation as they were refoaming in place. What I hate is getting into these speakers that have previously been "refoamed"-wrong. My general theory is that anyone who has changed, deleted or replaced the insulation would not have bothered to replicate all that. In addition there are some 'cuts' in the original insulation where wires go through and for x-over parts. That loose piece often varies in size and shape. Also, above the 'netting' I usually see some bare insulation just behind the woofers just to keep things tight I suspect. In the large Advents that I have been into, there is a netting type material that is the final cover over the insulation-that's a pretty good indication that everything is there as it should be. At that time I will try to learn the many posting options and also try to set up an email address exclusively for this forum. I will be unable to reply to this post until 5/29/06. In answer to your question, I would place two pieces of foam under the woofer and then stack the other three pieces under the tweeter, so that there are no echo chambers in the cabinet. If these braces improve sound quality, I will add them to my furniture models. If there is anyone here who knows why Advent added the two vertical braces to the New Advent utility cabinet, I would like to hear about it. The design change in the interior of the U4 cabinet mystifies me, even more now that you have mentioned the additional piece of foam. This arrangement leaves the crossover exposed. The other two pieces were curled into the top of the cabinet so that half of the foam was touching the top of the cabinet and the other half was touching the top of the back of the cabinet. Two of the foam squares were stacked under the woofer and the woofer magnet pressed down into the one on top. However, it seems to me that all of my A3 and A4 cabinets had only 4 pieces of foam. I'm sorry, but I can't remember how many pieces of foam were in the U4 cabinets. This makes me wonder why Advent decided to include the braces in the utility model and what differences these braces make to the sound of the speaker system. With the exception of the two U4 utility cabinet braces, the interiors of the A3 and A4 furniture cabinets are identical to the utility models. The braces are glued vertically to the center of the right and left inside panels of the cabinets. There are two particle board braces in each cabinet, measuring 21" x 2" x 3/4". However, I did encounter the braces in a pair of U4 Advents that I disassembled last week. I have never seen the "internal brace" that you mentioned on any A3 or A4 cabinets. So far, I have been restoring only New Advent speaker models A3, A4, U3 and U4.
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I don't know how this reply will look when and if it appears on the forum. I just got signed in to this forum last night, but I have been lurking around for at least 6 months.