--------------- FIDO MESSAGE AREA==> TOPIC: 183 AUDIO Ref: DAB00007 Date: 06/05/96 From: GLENN FEHRS Time: 06:47am \/To: JOHN ALLEN (Read 2 times) Subj: Dynamat Re: Dynamat > Dynamat is a remarkable, but expensive product for mobile application > I have also seen it sandwiched between two layers of MDF for home stereo > applications, but was a little disappointed with the results in that usage. I > also tried using it as an internal damping material in building a three-way > speaker system for the home and cannot rec' it for that use. It sounded awful > But, for mobile apps, I haven't seen anything even remotely like it. Good info, thanks! > My son advises that vehicle doors, trunk lids and walls, and hoods ca > all benefit from its' usage. He has lined the roof and front floor of his > vehicle with it also. It has made a remarkable difference in quieting down th > interior from road noise/sounds, as well as calming vibrations from his sound > system. Sounds like something I can really use. Any mail-order sources where I can uy this? How expensive? Glenn --- VFIDO 6.20.00 Gamma Candidate 10 * Origin: Vast Visions (1:141/590) --------------- FIDO MESSAGE AREA==> TOPIC: 183 AUDIO Ref: DAB00008 Date: 06/04/96 From: PAUL WILSON Time: 12:55pm \/To: GLENN FEHRS (Read 2 times) Subj: Re: car audio -=> Quoting Glenn Fehrs to Bonnie Goodwin <=- GF> Re: car audio gF> Have to agree with you there! I can't believe what I hear going down GF> the street lately, nothing but massive amplifier power and subwoofer GF> thump, noise to impress the kiddies. I'm doing some enclosure design GF> for auto as well as home systems. Being more inclined to classical and GF> jazz than rock, I'm looking for the right drivers for the car to build GF> a very tight, low-Q sub system that can reproduce deep bass accurately GF> without boom, and keep the transients ultra-clean. If I can accomplish GF> this and still have most of my trunk available, I'll be very happy. GF> I would appreaciate info from anyone here on quality drivers, GF> mail-order sources, and design software that can do calculations for GF> multiple woofers in a single enclosure, multi-chamber vented boxes, GF> bandpass subs, isobarics and transmission lines. I'm also interested in GF> mail-order sources for high quality amps, crossover components, GF> installation hardware, connectors, cabling, etc. Has anyone here used GF> Dynaudio drivers? Just got a partial catalog, and the specs are GF> impressive. GF> Interested in talking to any speaker builders out there! I'm a speaker..er...enclosure builder. I agree low-Q is the way to go. I'm an installer and although I have to deliver what the people I try to sway them towards fidelity and not boom. BOOM IS OUT PEOPLE. It went out with the 80's. I put a pair of 6" dynaudio's in the doors of my car. The model number fails me now. Very fine drivers. I highly reccomend them. I have some Tline and bandpass enclosure programs as well as a basic sealed/ported job wrote myself..not great but it gets the job done. GF> -!- VFIDO 6.20.00 Gamma Candidate 10 GF> ! Origin: Vast Visions (1:141/590) ... "What?!? This isn't the Files section?!?" ___ Blue Wave/QWK v2.12 --- Maximus/2 2.02 * Origin: KCC BBS, Peterborough, Ont. Canada (705)748-0023 (1:253/122) --------------- FIDO MESSAGE AREA==> TOPIC: 183 AUDIO Ref: DAB00009 Date: 06/04/96 From: PAUL WILSON Time: 01:00pm \/To: WILL THOMPSON (Read 2 times) Subj: Re: Subwoofer Hookup? -=> Quoting Will Thompson to All <=- WT> I want to use the subwoofer only from a 3 piece Sat/Sub system. I'll WT> hook my full-range bookshelf speakers normally as Speakers A and the WT> subwoofer to Speakers B and not use the sub's built-in crossover & sat. WT> output. Should the sat speaker output be terminated with a 8 ohm WT> resister as a load for proper operation of the subwoofer? I don't want WT> to kill it's crossover if it needs to "see" a 8 ohm load there and I WT> don't want to use the little sat. speakers. What's right? WT> Thanks in advance, Will As long as your sub has a passive crossover, you won't have to terminate the sattelite outputs. Hell unless it's self powered you should NEVER have to resistorize. ... "What?!? This isn't the Files section?!?" ___ Blue Wave/QWK v2.12 --- Maximus/2 2.02 * Origin: KCC BBS, Peterborough, Ont. Canada (705)748-0023 (1:253/122) --------------- FIDO MESSAGE AREA==> TOPIC: 183 AUDIO Ref: DAB00010 Date: 06/04/96 From: PAUL WILSON Time: 01:03pm \/To: ALL (Read 2 times) Subj: used gear Please help me I have just moved to Ontario from New Brunswick. I had to leave all of my "tinkering" gear home. Anybody have any malfunctioning or broken automotive head units or amps? Please help me. I'm bored stiff and a little fix-it-up job would help pass the time and get my mind off my fiance that I had to leave home. ... "What?!? This isn't the Files section?!?" ___ Blue Wave/QWK v2.12 --- Maximus/2 2.02 * Origin: KCC BBS, Peterborough, Ont. Canada (705)748-0023 (1:253/122) --------------- FIDO MESSAGE AREA==> TOPIC: 183 AUDIO Ref: DAB00011 Date: 06/05/96 From: PAUL WILSON Time: 08:48am \/To: MICHAEL ADDISON (Read 2 times) Subj: Dynamat Re: spl12's.. Have you heard any of JL audio's products?? I have 4 8w6's in my car and only run em 2 at a time. (2 are bandpassed,2 are sealed) It's amazing the amount of output these 'lil 8's are capable of. --- Maximus/2 2.02 * Origin: KCC BBS, Peterborough, Ont. Canada (705)748-0023 (1:253/122) --------------- FIDO MESSAGE AREA==> TOPIC: 183 AUDIO Ref: DAB00012 Date: 06/05/96 From: WILL THOMPSON Time: 03:37pm \/To: ALL (Read 2 times) Subj: LP Collection * Crossposted from: BarterTown - Buy, Swap, & Sell Echo Audiophile Clearance Selling 650+ LP collection from '60 - '80's music. Classical, Rock, Jazz, Folk, Pop, Bluegrass, Hard Rock. No Rap or Heavy Metal! All good to excellent condition played on an audiophile turntable only. 400+ standard records, 200+ Audiophile Recordings (Mobile Fidelity, Direct to Disk, etc) Send S.A.S.E. (3 stamps) for 10 page list to: Will Thompson 9167 E. Visco Place Tucson, AZ 85710-3166 ... InterNet: eb53112@goodnet.com -or- ckc@gas.uug.arizona.edu --- S. Arizona Stick Lizard Country * Origin: The Home Remote Comm Sys, Tucson, AZ USA 1-520-292-0997 (1:300/25) --------------- FIDO MESSAGE AREA==> TOPIC: 183 AUDIO Ref: DAB00013 Date: 06/05/96 From: GREG COBB Time: 09:47pm \/To: DAVID SNOSWELL (Read 2 times) Subj: Porting Hello David! Sunday June 02 1996, David Snoswell babbled to All: -> I'm going for a ported design and I'm wondering how critical port -> dimensions are. I'd say extremely critical. -GCobb- gcobb@memphisonline.com --- BytemeEd v0.00 * Origin: Picture This... AMU - OS/2 - Concord v0.01 (1:123/434) --------------- FIDO MESSAGE AREA==> TOPIC: 183 AUDIO Ref: DAB00014 Date: 06/06/96 From: JOHN ALLEN Time: 08:19am \/To: DAVID SNOSWELL (Read 2 times) Subj: Re: Porting > G'day folks! I am currently building a couple of subs for a small PA system. > I'm going for a ported design and I'm wondering how critical port > dimensions are. I've seen a lot of cheaper commercial designs that just > have a rectangular "hole" at one end of the baffle, very few seem to use a > round port of a specific length as in HI-FI stuff. Is this because it > doesn't matter or they don't care? I'm using a single RCF L 15P 530 in Hello David, Port demensions are one of the most important parts of loudspeaker design and building. Ports are intended to make a speaker as efficient as possible by utilizing the air movement from the rear of the moving loudspeaker. The rear of the speaker generates the same amount of moving air/sound, as does the front. Some argue that it actually generates slightly more...but I am unconvinced. I believe it just dissipates the moving air more due to the build and angle. Ports like you mentioned, just drilled or sawed in at no particular measurement, aren't much more than an air leak. Whereas ports of calculated diameters and lengths, properly sealed to the enclosure and "flared" at either end to cut down on air turbulence noises, are actually tuned to and enhance certain frequencies in the bass range. This makes the ported speaker far more efficient (but less accurate) than a sealed loudspeaker. The ported speaker requires far less power to drive than a sealed enclosure. And, the ported enclosure will give you deeper and higher amount of bass reproduction than a sealed OR haphazardly ported loudspeaker. There are numerous books, computer programs and actual designs for the speakers you are considering. I would take a look at a few. If really interested I would purchase: The Loudspeaker Design Cookbook by Vance Dickensen. I believe it is up to the 5th or 6th edition. It runs around $30 and is really fascinating reading for anyone interested in any type of audio, whether building a loudspeaker system or not. I bought the book a few years ago and blame it and the author for getting me started designing and building systems that have kept me awake at night trying to squeeze every last db of sound out of then. It is a great hobby. But even if not interested in building a system, just the understanding of the principles set up and explained in the book assist you greatly in setting up all kinds of sound systems in not so perfect surroundings. Cheers, John www.grump@netzone.com --- AdeptXBBS v1.07f (Registered) * Origin: Tempe, AZ USA (602)491-5285 (1:114/20) --------------- FIDO MESSAGE AREA==> TOPIC: 183 AUDIO Ref: DAB00015 Date: 06/06/96 From: JASON LAVOIE Time: 06:09pm \/To: DAVID SNOSWELL (Read 2 times) Subj: Re: Porting DS> I'll go with that. A nagging question remains... does it really make uch DS> difference? A rectangular port is much easier to make. Any advice would b DS> appreciated :). from what I've picked up, the shape of the port does not matter, as long as the opening size and port length remain the same. Jason Lavoie --- Renegade v5-11 Exp * Origin: Cranial Disturbance (613)723-9841 (1:163/572) --------------- FIDO MESSAGE AREA==> TOPIC: 183 AUDIO Ref: DAB00016 Date: 06/07/96 From: JOHN ALLEN Time: 07:54am \/To: GLENN FEHRS (Read 2 times) Subj: Re: car audio > drivers. The Focal and Cabasse lines are impressive! Also Accuton tweeters > and midrange units look like choice items, once you recover from the sticker > shock. :-( Wait until you get the prices on high end crossovers!!! But I remain convinced that in Audio, you really get what you pay for. Ref. below>> Your background in electronics will save you some big money there. I lack the expertise to design and build my own crossovers. So I rely on an outfit in Calif that builds custom units to your specs. Fantastic quality and build with your choice of slopes and freqs! > I've seen ads for the Loudspeaker Design Cookbook, and will order a copy > soon. Does it go into any good detail on Bandpass and Transmission Line Absolutely. They begin with mid to advanced basic theory and move all the way through the design process including the math and charting out what a finished projects would look like in graph. So far it is the best I have seen for someone having the skills but needing direction. > As to level of expertise, I've been an electronics tech for many years, > have a > strong woodworking/cabinetmaking background, have built composite structures > for aircraft and boats, and have done a lot of R&D work building > electrical/electronic prototypes for industrial equipment. I've always had a Yessss! Someone to brag to for a moment. [Loud Mouthed Bragging Mode On] My neighbor is a composites guru for the aircraft industry. He fixes what the rest mess up and plans the new state of the art projects for them. I am a woodworking fanatic. I build furniture, wall units and cabinets. A couple years ago I became fascinated with the Hsu Subwoofer design. So we put our heads together and built a kevlar composite shell rather than the cardboard form used by Hsu. We used an exceptionally high carbon composite. We bowed the top to cancel standing waves and built in the platform for the crossover and the tuned port. The crossover was protected by a second piece that snapped into place and could be sealed with adhesive. In later models we included the flared ports in the design which cut down on turbulence noise. We ended up with some exceptionally light and strong structures that sounded quite good....not high end....but much better than the commercial grade powered and unpowered subs you see on the market now. My main mistake was trying to include too much in the basic design. I had got carried away with the project and forgot the KISS technique. My next attempt will be the 92 inch model (yep, 92" !!!) with a 12 inch woofer. I will still bow the top cap, but will make it an add on to be assembled with some good space aged adhesive. Same with the bottom baffle, which I reinforced with 2.25 inches of medite and the port. They will be added to the shell. The crossover will be an external. The crossover placement, and decisions about protecting it from vibration and wind damage was the biggest problem before. From Hsu's design, it looks like he learned that the first go round also. But next I am going to build set of rear channel for AC-3, as soon as we see a definative answer as to the amout and avg freq of bass information we will be getting in the rear channels. No one knows yet. Many of the high end designers like Duddleston @ Legacy are waiting until the smoke clears and not offering anything different than their THX rears in di/bipole. And it will probably be a few months before we see anything we can count on. > On the software side, do you have any experience with Top Box? Can you > reccomend anything else that is good? I've tried Speaker Workshop (basic, > but > solid), SDES (total crippleware, can't even evaluate it properly), Bandbox > (doesn't even RUN), and LED (looks OK, but memory hungry and awkward to > navigate, requires a spreadsheet). Still haven't found what works for me. > LEAP is a distant dream, of course! I have pretty much just stayed with the spreadsheets for basic number doodles. I haven't personally looked, either. I have called a friend with the LEAP set up and took his feedback. Perhaps it is time to get off my duff and see whats new in the world. There used to be a regular participant here in the echo named Matt Ion that ran a BBS dedicated to audio. He had quite a few programs that he said were quite good. Not flashy like so many of the Windoze apps, but number crunchers for speaker builders none the less. ANYONE FOLLOWING THIS THREAD HAVE SOME INFO ON AUDIO SOFTWARE FOR SPEAKER AND LISTENING ROOM MODELLING??? Please feel free to chime right in!! I will try to find Matt and see if he still has his BBS running. Also, Old Colony used to advertise a number of apps. Perhaps some of the people here have some experience with the shareware apps??? Cheers, John --- AdeptXBBS v1.07f (Registered) * Origin: Tempe, AZ USA (602)491-5285 (1:114/20)