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In Reply to: RE: Your best tweaks for fullrange posted by aupiho on May 08, 2015 at 00:37:22
damp mechanical resonance with the best available constrained layer damping material this will provide maximum reduction in mechanical vibration. Damp acoustical resonance/reflections with acoustical felt which has the widest possible absorption coefficient. The best time to do theses things is when you are building the driver or when you are rebuilding the driver so you will have full axis to the pole piece the top plate and the basket, otherwise you will need to remove the dust cap to access the pole piece. After the fact damping can be applied to the top plate by incisions in the side of the spider. Available space under the spider will be the limit as to what you can do there. Acoustical damping can be installed between the cone and the spider to absorb reflections between the top plate and the cone, this is also very effective in catching reflections between the basket and the cone. Felt can be applied to the inside of the basket as well. Each driver will offer its own unique set of conditions so there is no one recipe. I use these techniques to treat woofers mids tweeters cone/dome and compression drivers. Cost will often dictate what and how much you do to a given driver. I like to damp both sides of a basket with CL damping and felt but this is not inexpensive to do so you need to decide if the driver is worth it. This is a time consuming method and it is not inexpensive but it is very effective. Non treated drivers will soon become very unattractive to you. This is a very powerful system for the improvement of drivers. Hope that this helps. Best regards Moray James
moray james
Follow Ups:
the best available constrained layer damping material . . .
Such as?
TIA
dynamat or hushmat there are many such products and availability will usually determine what people will use. F-11 Acoustical felt is the very best possible felt (real wool) it has the widest bandwidth of absorption available. I like to use three layers of 1/8" F-ll looses around the cone so that it damps both cone and spider energy. this makes for a huge improvement in bass SQ. Hope that helps. Best regards Moray James.
moray james
there are many such products and availability will usually determine what people will use
Thanks for that. As it goes, I put plenty of a local Dynamat equivalent on my drive units several years ago but I'd not thought of using felt.
D
I bond about a 1/4" layer of F-11 on the inside of the baskets on top of the CL material. The felt used around the cone needs to be free of the cone and the spider so I cut doughnuts each is a different size ID to track the cone expansion. By the way synthetic felt like acrylic craft felt and some of the packing felt is a wast of your time synthetics do not work or sound (absorb) anywhere near natural wool felt.
moray james
moray james:
I bond about a 1/4" layer of F-11 on the inside of the baskets on top of the CL material, etc, etc.
I reported earlier that I'd fitted CL damping to my drive units. Well, so I had but, as it turns out, to speakers I sold some ten years ago. As the frame on my "newer" drivers is made of diecast aluminium and as the arms are short, I'd not bothered this time round.
So, this afternoon and in light of your tip, I fitted as many strips of Dynamat equivalent as I comfortably squeeze onto to the frame and put 1/8" (3 mm) wool felt on top where appropriate.
Yes, it's made a very worthwhile improvement - smoother sound, more of that "in the room" feel. I don't think I'm finished yet but it's been a good start. Many thanks to all for the ideas.
Dave
I bond about a 1/4" layer of F-11 on the inside of the baskets on top of the CL material. The felt needs to be free of the cone and the spider so I cut doughnuts each is a different size ID to track the cone expansion. By the way synthetic felt like acrylic craft felt and some of the packing felt is a wast of your time synthetics do not work or sound (absorb) anywhere near natural wool felt.
moray james
Moray,Used some spare 'Madisound Sound' felt to line both sides of the mid-range basket arms as I understood you to recommend; a fiddly procedure that took three hours and yet such was the improvement in natural tone that I much look forward to repeating the task on the woofer basket arms when new felt arrives. Many thanks.
Have found that two layers of Neoprene 60 Gasket Duro Rubber between the tweeter and speaker cabinet protect the sensitive treble from the bombardment of neighboring heavy mid-range vibrations and allow it to produce well-focused notes. You write with a technical familiarity that I lack and so am left unclear as to whether you offer a better tested solution there.
DG
Edits: 05/09/15 05/11/15
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