Chris Robinson Posted February 24, 2003 Share Posted February 24, 2003 The tail board is about 4" wide and 3' long, running from the bottom of the HF section down to near the floor. It is essentially the reflecting piece for the sound waves emerging from the rear of the LF bin. Quote Link to comment Share on other sites More sharing options...
Chris Robinson Posted February 24, 2003 Share Posted February 24, 2003 Not sure what you mean by the "base plywood". If it's the "base" of the HF section, and that butts into the top of the tail piece, then "yes", you should put a seal there. Basically you have each side of the speaker sealed to the wall in two places; one horizontal and one vertical. We should just draw a picture, huh? Quote Link to comment Share on other sites More sharing options...
Mallette Posted February 24, 2003 Share Posted February 24, 2003 Alrighty, sir. I see the light...shining through the 3/4 inch gap between said board and wall. Now, what about the base plywood. Where should a seal be applied there? Dave Quote Link to comment Share on other sites More sharing options...
Mallette Posted February 24, 2003 Share Posted February 24, 2003 OK, managed a seal with available materials on one. Now, I've sealed the HF section previously. Does the TOP seal provide any function? If not, I could scavenge enough to give the other horn a try. Also, what of the cutout at the bottom of the tailboard? It seems a bit deep to simply be for baseboard clearance, but perhaps its the angle? Dave Quote Link to comment Share on other sites More sharing options...
Chris Robinson Posted February 24, 2003 Share Posted February 24, 2003 Dave, you have some kind of magic! How do you get double-posts ten minutes apart? Share THAT secret, will ya? Quote Link to comment Share on other sites More sharing options...
Mallette Posted February 24, 2003 Share Posted February 24, 2003 Danged if I know. It's happened too often recently. Sorry. Wish we could delete posts! Dave Quote Link to comment Share on other sites More sharing options...
artto Posted February 24, 2003 Share Posted February 24, 2003 I sealed my Khorns with closed-cell foam weather striping between the top & bottom units, and between the wall & outside edge of the top unit that forms the top of the bass horn. Since I bolted the tail board to a wood corner plate as I described above, the back of the corner/wall area is already sealed tightly. My Khorns are on a heavy, commercial weight, thick pile, medium height carpet. I used to have them on a tiled floor & sealed them along the bottom edge with closed-cell foam. I didn't notice any difference with the Khorns sitting on the carpet. And since the shortest wavelengths the bass horn has to produce are over 2 feet long, I don't see any advantage to the Khorn needing to be on a "hard surface" such as a tiled or hardwood floor in the corner. In fact, the carpet may actually help absorb any extraneous higher frequencies emminating from the woofer. I did not physically bolt my Khorns to the wall/foundation corner plate until they had been sitting there a long time so that the carpet pile & the underlayment could settle under the weight of the Khorn. Dave, you can bring out quite a bit more bass from the Khorns by proper room damping, acoustically. In my experience, its not really been a case of "bass shy". Its more of a "too much room midrange/treble" problem. Auralex & Sonex make open-cell acoustic absorption foam in various configurations that can be applied to the rear & rear side walls. I use a continuous run of Auralex lenrd bass trap across the top rear wall/ceiling intersection. And a combination of 3" Sonex "classic" anechoic wedge panels & 2" Auralex DST 114 on the back wall (about 70% coverage) with some extending around the rear side walls. I don't have pictures of the rear wall yet as I'm still tweaking the acoustics in this room's fourth revision. You might want to take a peak at my thread in the Architectural topic area ("artto's klipschorn room"). You can use 1-1/2 "T" pins (like those to hold papers & such on those fabric office partitions) to hold the foam panels in place while you experiment. The pins won't do much damage to drywall & it can be easily repaired if it does. http://www.auralex.com/acoustic_foam_dst_114/acoustic_foam_dst_114.asp http://www.auralex.com/bass_traps_lenrd/bass_traps_lenrd.asp http://www.mhtc.net/~lowey/Acoustical%20Foams.htm A device you might try is a pro effects unit called the Aphex Aural Exciter 204. It adds an apparent increase in bass without actually boosting the bass output. Cone excursion stays the same & it doesn't require more amplifier power. A little goes a long way with this unit so use it judiciously. Being more of a purist, I prefer the acoustic route, but the Aural Exicter is an option. They made a model 104 which you can probably buy used for $100-150. http://www.aphex.com/ Quote Link to comment Share on other sites More sharing options...
Mallette Posted February 24, 2003 Share Posted February 24, 2003 Hmmm... seems I'm invading someone else's thread here, but hopefully my questions are providing info useful to him as well. The Aphex has been around a long time. Never heard one, but quite a bit of excitement in the late '70s. I've also used a lot of Sonex in my time...though a bit pricey for me at the moment. Further, I am quite happy with the mid and high response. The little bass booster I use doesn't seem to make the bass tubby or anything, so I am not unhappy with it except in the sense it makes me feel like PWK is scowling down at me. I feel the same result can be achieved without this aid by proper sealing. Your point about the base plywood is understood technically. However, sometimes things that don't make much sense technically work anyway...perhaps for some other reason. Any, it's such a cheap tweak I may give it a try if I am not satisfied with the results of sealing the bass cabinet. Dave Quote Link to comment Share on other sites More sharing options...
Mallette Posted February 24, 2003 Share Posted February 24, 2003 Hmmm... seems I'm invading someone else's thread here, but hopefully my questions are providing info useful to him as well. The Aphex has been around a long time. Never heard one, but quite a bit of excitement in the late '70s. I've also used a lot of Sonex in my time...though a bit pricey for me at the moment. Further, I am quite happy with the mid and high response. The little bass booster I use doesn't seem to make the bass tubby or anything, so I am not unhappy with it except in the sense it makes me feel like PWK is scowling down at me. I feel the same result can be achieved without this aid by proper sealing. Your point about the base plywood is understood technically. However, sometimes things that don't make much sense technically work anyway...perhaps for some other reason. Any, it's such a cheap tweak I may give it a try if I am not satisfied with the results of sealing the bass cabinet. Dave Quote Link to comment Share on other sites More sharing options...
ssh Posted February 24, 2003 Author Share Posted February 24, 2003 Dave, Interesting and useful. Thanks,guys.More than anything,you've confirmed that I'm on track & not going to screw up something.Again,the specific suggestions about materials are very helpful. Quote Link to comment Share on other sites More sharing options...
WMcD Posted February 24, 2003 Share Posted February 24, 2003 I thought there was a drawing which accompanied the DfH. It showed rubber flaps on the tailboard. Does anyone have it? Gil Quote Link to comment Share on other sites More sharing options...
bigdnfay Posted February 24, 2003 Share Posted February 24, 2003 maybe this will help......page 1 page 2 follows. Big D Quote Link to comment Share on other sites More sharing options...
bigdnfay Posted February 24, 2003 Share Posted February 24, 2003 page 2 Quote Link to comment Share on other sites More sharing options...
Mallette Posted February 24, 2003 Share Posted February 24, 2003 OK, experiment complete sans floorboards. I found another roll of foam in the garage and duly appied to the tailboard top to bottom. Tilted the beasties up, shoved them up against the wall and let them down slowly. All the areas of tailboard visible appear to be sealed nicely to the wall. Initial impression was that things tighted up a bit. I note that the Klipsch instructions above suggest such sealing was most effective at 200-400hz. I suppose "tighter" is somewhat consistent with that. I put on the Telarc Michael Murray recording from the Cathedral of St. John the Divine. This has one of the most demanding bass tracks I've ever heard because it is QUIET. 32" pipes with the swell shutters closed. It's about 5:00 into the Franck Choral. Very nice. Even though I had relatively low volume set, I had to switch my rear Fraziers out as they rattled a bit. Them big 'ol horns did what they do best...quietly rumbled the room cleanly. If it is possible for me to hear the difference in the first watt of a VT70i and a good SET amp, I'll be it would be here. I suspect this was pulling .5 watt or less. Anyway, thanks to all. Nice tweak for a sleety, nasty day. Maybe I'll try the plywood next. Dave Quote Link to comment Share on other sites More sharing options...
ssh Posted February 25, 2003 Author Share Posted February 25, 2003 Thanks,Big D.This confirms that artto's suggestions about materials are right on.I would have shimmed a piece of wood,then applied the weatherstriping,but thought you guys might have a better idea.Now I'm on a scavenger hunt. Quote Link to comment Share on other sites More sharing options...
Mallette Posted February 25, 2003 Share Posted February 25, 2003 So 80 miles in what direction from Hope? I was raised in Texarkana. Dave Quote Link to comment Share on other sites More sharing options...
ssh Posted February 25, 2003 Author Share Posted February 25, 2003 OK,Mallett,I've gone to another computer & can reply now.I guess you got my E,but if anyone else is curious,my hometown is El Dorado. Quote Link to comment Share on other sites More sharing options...
Mallette Posted February 25, 2003 Share Posted February 25, 2003 Kewl. Spent 5 years at SSC in Magnolia. Always wondered what happened to Bob Endel and David Adcock. Let me know if you run into any guys by that name. Dave Quote Link to comment Share on other sites More sharing options...
ssh Posted February 25, 2003 Author Share Posted February 25, 2003 Well,you just never know who you're likely to run into.I went to high school with both of them.Haven't seen them for Years.You were in good company,in my opinion.Grins,here. Quote Link to comment Share on other sites More sharing options...
Mallette Posted February 25, 2003 Share Posted February 25, 2003 Ahrrrrrrg. I beginning to hate this web engine. If it don't double post, it 401's then loses the post. Anyway, Bob and I shared a love for French organ music, and he and I and Dave were all in the band frat. Both were Klipsch heads, and Dave and I got a personal tour of the plant from PWK in 1971. We kept up contact (Adcock and I) until about 7 years ago when his phone and address in ElD went bad on me. Tried several searches since without luck. Worries me. Good man. He was working for some Minnesota bank supply outfit at the time. Dave Quote Link to comment Share on other sites More sharing options...
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