| Forum Home | ||||
| PC World Chat | ||||
| Thread ID: 79098 | 2007-05-08 03:39:00 | Speaker Baffles | Hitech (9024) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 548167 | 2007-05-08 03:39:00 | Does anybody know how to fix speaker baffles to get rid of resonance in my speakers, Appreciate some help please.:help: | Hitech (9024) | ||
| 548168 | 2007-05-08 04:12:00 | Ummm. ;) There are a number of manufacturers who produce speaker enclosures with controlled responses, from designs based on very clever calculations, followed by a lot of experimentation. "Good" speakers tend to be quite expensive. I'm very sorry that I don't know how to fix baffles to get rid of speaker resonances. :D |
Graham L (2) | ||
| 548169 | 2007-05-08 06:05:00 | I think Graham forgot to say that to eliminate resonance, you need to have a damping factor, greater than critical damping, about 0.7, or even greater than 1.0. This is quite a difficult if not impossible thing to achieve with plastic cased computer speakers. Brick is quite a good material, rebuild your speaker enclosures using bricks. The plywood that used to be made for radioactive screening with a lead sheet as the centre laminate was also excellent. Another material was sand filled plywood panels, the friction between the sand grains gave the required damping. Failing to get materials like this, then rather than playing with baffles, try to add bracing struts between the speaker cabinet walls to make the sides more rigid. :) |
Terry Porritt (14) | ||
| 548170 | 2007-05-08 06:20:00 | When reinforcing speaker cabenets to make them sound better, it is probably better to use random sized scraps than aim for uniformity, unless you know exactly what you are doing. This is a trick used by at least 3 of my compeditors and i have to admit, there's something nicer in the sound of the cabs for having this alteration. Of course before doing this, it is important to have the right sized ports for the speaker, and cab dimensions, and phase of the moon... Ok kidding on the last one. The last cabenet i built myself i had designed by someone else as i really couldn't be bothered adding the needed design skills to the list of things i know enough about to be dangerous :D |
personthingy (1670) | ||
| 548171 | 2007-05-08 07:40:00 | I should inform you all that these speakers are for my sound system they are mission 700s, and cost $500 for a pair. | Hitech (9024) | ||
| 548172 | 2007-05-08 07:43:00 | I should inform you all that these speakers are for my sound system they are mission 700s, and cost $500 for a pair. Never expect wonders from cheap speakers... sorry, just the way it is. The ones that most recently had random reinforcememnt cost just under a grand each for a 2x15" + horn deal, which were then reinforced, and had about a grand and a half worth of P-audio drivers put in them. They belong to a friend of mine Jo who provides the PA for the Jetset Lounge in CHCH. He takes it seriously enough to power these cabs with a FP6400 lab.gruppen for mids, and a (something)2000 lab.gruppen just for the horns... hugesound.co.nz do the same trick Jo's cabs sound wonderful, and idle with almost every band i have heard there. Random reinforcement is good The randomness means that the cab is less likely to have a particular frequency that it misbehaves at... |
personthingy (1670) | ||
| 548173 | 2007-05-08 08:02:00 | None of the reviews of these speakers I have Googled mention cabinet resonance, I get the impression this model is a number of years old now, and if yours are not new it is just vaguely possible something has come adrift or loose inside. www.reviewcentre.com I'd be inclined to try to determine which part or parts of the speaker system are resonating. If you had an oscillator, you could do a frequency scan to help determine this. I would still be inclined to glue bracing rods, say made from dowelling, inside the cabinets, like this: www.imagef1.net.nz Dowels could also be glued at right angles to brace the side panels as well as front to back. I wasn't really joking about brick, if you were into Hi-Fi in the early 1950s, it became quite a rage : www.imagef1.net.nz :) |
Terry Porritt (14) | ||
| 548174 | 2007-05-08 08:19:00 | Electronics Australia many years ago had pictures of a pair of exponential horns built by an enthusiastic audiophile . The mouths were the "side walls" of his sound lounge, and the horns were made of ferrocement . Of course, any internal stiffening will reduce the internal volume of the enclosures . This will change the acoustic properties, at least raising the cavity resonant frequency . This will affect the behaviour of the drivers . |
Graham L (2) | ||
| 548175 | 2007-05-08 08:59:00 | How about the horns used with Cerwin Vega subs so many years ago? I'm talking early 80's perhaps even late 70's? 2x18" strokers, (speakers which i beleive are now marketed to boy racers as penis substitutes) with optional plywood horns which were bigger than the avorage bedroom. Mainstreet Caberet in Auckland used 2 of these horns per side that bolted directly onto the 2x18" subs of the inhouse PA system... I saw, or rather heard "The Dead Kennedys", "Siouxie and the Banchees" and truckloads of talentless local bands through those speakers. To the best of my knowledge these toys are now in the private collection of a Greymouth man. Sometimes i love the old tech way of doing it. Stuff trucking that from venue to venue tho! :waughh: |
personthingy (1670) | ||
| 548176 | 2007-05-08 09:24:00 | I note the review Terry linked to politely hints that the mission 700's sound bloody awful unless mounted on stands..... Boomy was the word they used. |
personthingy (1670) | ||
| 1 2 | |||||