=========================================================================== Digest of articles related to speakers =========================================================================== Newsgroups: alt.guitar From: nasiatka@anhep3.anl.gov (Jim Wylde Metal Fag) Subject: re: Speaker Design Organization: Argonne National Laboratory, Argonne, Illinois Date: Tue, 1 Dec 1992 17:47:37 GMT In article <1fb3s3INN5jb@matt.ksu.ksu.edu>(Alvin Nor Mortensen) writes: > >I was looking into designing some cabinets and came across a reference to >a program called PERFECT BOX. Does anyone know the ftp site for this program. I don't know about any PERFECT BOX program, but I can guess that it is probably something pretty basic that asks you for info on your speakers, and churns out box sizes. I would reccomend you get a copy of The Sound Engineers Handbook. It's proven invaluable to me with my box designs. It has all the formulas and things you'll need for box size, crossovers bandpass filters.... I'll see what I can dig up and type before my fingers crap out today or tomorrow for ya. Basically if you know how to work a calculator and a table saw, speaker cab design is pretty simple if you start with good quality speakers. Talk to ya later! Jim Wylde --------------------------------------------------------------------------- Newsgroups: alt.guitar From: gateway::"nasiatka@anhep3.anl.gov" (Jim Wylde - Metal Fag) Subject: re: Speaker Design Organization: Argonne National Laboratory, Argonne, Illinois Date: Wed, 2 Dec 1992 19:47:55 GMT In article (John Deal) writes: > > Tried email but bounced but I have a question. Whoops! Sorry 'bout that! It seems something is fucked up between the feed on the East Coast and the Midwest or something.... Try ::::: Gateway::"nasiatka@anlhep.anl.gov" That should work :) > Is this the same book as "The SoundReinforcement Handbook" by Gary Davis >and Ralph Jones? I have seen this book in mail order catalogs and have been >thinking about getting it but at approx. $35 I am still thinking. If this is >the same book as you refer to could you tell me more about it? Noooooo... I have the "Sound Engineers Handbook" put out by John Wiley Publishers. (remember your old engineering texts??) It's about the same size as CRC Handbook of Chemistry and Physics - meaning it will break a weak table if your not careful! I picked mine up for around 120.00 about 3 years ago. I've found it to be invaluable as a reference. It covers everything from psycoacoustics, to sound reinforcement, to mics, to actual speaker design, Theil Small parameters and how to measure them, hi, lo, and bandpass filters of all different types from Butterworth to Chebychev on all orders...., amplification, you name it. In any case, I don't think it's the $35 one you were looking at. If ya got any more questions, lemme know! :) Harder! Louder!! FASTER!!! ----------------------------------------------------------------------- ______ \ / Hate is not a Family Value! Jim Wylde \ / Boycott Colorado!! \/ ----------------------------------------------------------------------- Sorry folks - I only know that Chris wrote this message. I wrote the ElectroVoice-level questions. Tim Stanley. > Hi. Im thinking of making my own amp/speaker combination. > I dont know anything about speaker cabinet design. If it wouldnt be too > >ElectroVoice used to give away speaker cabinet design sheets for >musical instrument/sound reinforcement applications. They had cab >designs for 1-18", 1-15", 4-12", etc with porting specs, etc. This >might be a good place to start - just write them a letter. I think >they are/were a Michigan company? > Celestion do something called the Celestion Speaker Enclosure Handbook or similar. It has got LOTS of designs. Get hold of it from them if you can. It is worth it! >Surely there are also some classic books on speaker cabinet design for >this sort of application - does anyone out there care to suggest a >book - I would be real interested too. Theile and Small published LOTS of papers in the early seventies detailing the mathematical relationship between resonance frequency and enclosure volume etc. Most loudspeaker manufactures give Theile/small specifications for their speakers, so getting hold of those papers is a good idea too. No I haven't got them!! If anyone knows of a definitive guide to Theile Small parameters PEASE LET ME KNOW ! Hope that helps. Chris ;-) --------------------------------------------------------------------------- Newsgroups: alt.guitar From: rabideau@acsu.buffalo.edu (Alan Rabideau) Subject: Re: BUILDING STAGE MONITORS, CABINETS Organization: UB Date: Mon, 31 Jan 1994 13:00:11 GMT In article , mikeb@ur.utk.edu (Michael K. Bradley) writes: > >Anybody out there got plans or blueprints, or just some good information >about building cabinets for floor monitors or amp speaker cabinets >to house 1x12" or 2x12" speakers? >is this a big deal to get everything acoustically right, or do you just need >a solid cabinet? >thanks! > >mike I built a couple 1x12 cabinets from plans distributed by Electrovoice for their EVM speakers. I think this is something you need to to do correctly, particularly if you are fussy about your guitar sound. Try contacting EV (unfortunately I don't have the info). They also used to distribute something called the "PA Bible" which had all kinds of useful information about sound system design. --------------------------------------------------------------------------- From morganc@earlham.edu Tue Feb 1 11:30:18 1994 Newsgroups: alt.guitar Subject: RE: BUILDING STAGE MONITORS, CABINETS Organization: Earlham College In Article mikeb@ur.utk.edu (Michael K. Bradley) writes: > >Anybody out there got plans or blueprints, or just some good information >about building cabinets for floor monitors or amp speaker cabinets >to house 1x12" or 2x12" speakers? >is this a big deal to get everything acoustically right, or do you just need >a solid cabinet? >thanks! > >mike Unfortunately, building speaker cabinets is very complicated. This is especially true for bass, as the size and construction of the cabinet makes a pretty big difference in just about every area of performance. You should try "The Loudspeaker Design Cookbook" which I think you can get from: Old Colony Sound Lab Post Office Box 243 Peterborough, New Hampshire 03458-0243 They give incredibly complex formulas and charts, which are useful if you have the know-how to apply them. If not, you can still get some idea of what's involved. Very recommended. --------------------------------------------------------------------------- From: tremolux@aol.com (Tremolux) Newsgroups: rec.music.makers.guitar Subject: Re: making extension cabinets - what materials ????? Date: 8 Jul 1994 03:42:01 -0400 Organization: America Online, Inc. (1-800-827-6364) In article , Jay Nelson writes: Paul Lamb (Lambo) cabinets can be purchased mail-order from Nate Kramer at Mojo Music in Napa, CA. Phone 800-927-MOJO. He'll put in whatever speakers you ask for, he does not have any particular one he pushes. For speakers, it depends greatly on the sound you want. Ask Nate about Tom Bremmer's speakers. He's making replicas of the old Jensens that sound better than any other replica on the market today. He even says that by Christmas he'll have a replica of the P12Q and P12N!!! I have just bought an original P12N, and now I know why they're in demand and so expensive. That is the sweetest speaker I've ever heard, and is very efficient. As far as Kendricks go, a friend put 2 of their 12 inchers in a blackface Pro Reverb, and it sounded harsh. I'll pass. The Hudsons and Naylors are replicas of the P12R, the wimpyest of the old Jensens that came in Fenders. (We'll ignore as unacceptable the P12S and the like, way to tiny a magnet and cheap.) The Rs can't take much power and don't have a lot of low end. You'd be better off getting original/rebuilt Jensens from Vintage Classic Organ Co in Minnesota where I got my N. He has Rs, Qs and Ns. --------------------------------------------------------------------------- From: lsprague@cass.ma02.bull.com (Lindley Sprague) Newsgroups: rec.music.makers.guitar Subject: Re: 10" speaker recommendation? Date: 2 Nov 1994 12:14:27 -0500 Organization: Bull Worldwide Information Systems. Richard Stern (rstern@col.hp.com) wrote: : Someone else wrote: : : A bit of clarification on the 10s. The Fender Blue Alnico Reissues and : : the MojoTone 10s are all made be Eminence in Kentucky. They're : : essentially the same thing. Mojo just changed the cone and voice coil : : formulas a bit to more closely conform to the old Jensen P10Rs. : : Save yourself money and hassle, just call Nate at Mojo : : Music in Napa, CA. He'll ship them to you. : Phone number?? And do they sell to regular folks, or are they a : wholesale only distributer?? Mojo will sell to "real" people, but only at their list price, which is about $75/speaker. Better to go through one of their dealers. They suggested a local store that sells them, but I ended up buying them from Bremer Music Supply, in Minnesota, (612)894-7494. They were only $30 each, if you buy more than one. The speakers have a "MojoTone" sticker on the magnet, but the packing slip calls them "10 Inch Alnico Eminance Resissue Speakers." Interesting. -- ...Lin Sprague... lsprague@crater.ma02.bull.com --------------------------------------------------------------------------- From: Dittrich@urz.uni-bamberg.d400.de (Alexander Dittrich) Newsgroups: rec.music.makers.guitar Subject: Re: Speaker Question Date: Wed, 14 Dec 1994 16:49:20 Organization: Rechenzentrum der Universitaet Bamberg In article <3btvgj$jrl@news.halcyon.com> black@hector.nmsu.edu (Jake C.) writes: >I have a PARK 25 watt amp and I connected my stereo >speakers into it.. My question is, can I blow my the regular >stereo speakers by doing this.. are the Db levels the same for >guitar speakers as for the stereo speakers? Yeah, you should have no problems blowing your hifi speakers :-)) Db levels are the same. In this case, they are a measure for the amount of sound pressure you get from a speaker with a given input at a given distance - usually 1 watt input power and 1meter distance. So DB levels, in case of speaker OUTPUT, tell you something about the efficiency of a speaker. They DO NOT tell you anything about the power handling capacity of this speaker!! In general, hifi speakers are designed to handle compressed, clean signals with limited dynamic range - like recorded music from CDs or tapes or whatever. When you play guitar, you generate signals with extreme (for hifi speakers!) dynamic range, spiked with sharp transients. This sooner or later means DEATH to your hifi speakers. You better use guitar speakers which are designed to take those hot signals. Hope that helps. Alex From metcalf@ix.netcom.com Thu Jun 12 16:54:12 1997 Newsgroups: alt.guitar,alt.guitar.amps,rec.music.makers.guitar Organization: Netcom From: metcalf@ix.netcom.com (Charlie Metcalf) Subject: Re: Question: 67' Deluxe Reverb Date: Thu, 12 Jun 1997 10:30:33 GMT Brad & Dona Bolton wrote: >ment@seaside.net wrote: >> >> I recently purchased a 67" Fender Deluxe Reverb amp. It has a mid 80's >> emminence speaker in it, but is otherwise stock. I want to know the best >> speaker and 6v6 tube (brand and model) combination to tighten up the bottom >> end without loosing the sweet, slightly compressed high end of an old mushy >> speaker, and NOS style tube. >I'd go for the Weber speaker (he has his own web page). Warm, old >Jensen sound. For tubes, I've heard the Ruby 6V6GC is a good one that >will handle high plate voltages. I use NOS Phillips 6V6 with good >results. I've never tried the Weber, but the 60's Oxford I put in my Deluxe reverb brings out the low end without giving up the mids & highs. As for tubes I cannot agree about the Ruby's. I had a pair. The tone was poor and they didn't last long at all. Currently I use nos GE's which sound quite good. Charlie ************************ * Charlie Metcalf * ************************ Newsgroups: rec.music.makers.guitar Organization: MCSNet Services From: "Teleologist" Subject: Re: Deluxe Reverb: reissue vs. original...opinion? Date: 1 Mar 1997 18:53:39 GMT Kenneth J. wrote in article <5f9k75$lua@tracy.umd.edu>... > > How close do you see the '65 reissues being to the originals? What are the > differences..are they great differences or minutia? Would a non-ampophile > be able to tell them apart ? > ken > They can be very close if you change the speaker, retube them with NOS 6V6GTs, and rebias for the new tubes. By the time you do this with a new one at the typical $600+ street price, you'll be close to the cost of an original BF in very good to excellent condition. Of course these may need work too, and if you're more comfortable with a warranty etc. the reissue can be a good way to go. Until very recently, no one has produced a very good version of the original Jensen 12s. The Eminence 12 used by Fender, Mojotone, & others is very stiff sounding & bright. With single coil PUs it has a tendency to 'razor-blade' the ears. Putting a Celestion in a DR works fine, but doesn't produce that classic DR tone. WeberSVT has just come out with some really good sounding Jensen clones. Haven't personally tried one yet, but people who have over on alt.guitar.amps are raving about them. Check out the WeberSVT web page. The problem with the Sovtek 6V6GTs used in the reissue(or any DR for that matter) is that they can't take the voltages a DR places on them & they smoke in a very short period of time and often take some internal resistors with them. Repairs are easy & cheap, but it is a nuisance replacing tubes every 3-6 months(some don't even last a set). There is currently a good supply of NOS USA 6V6GTs around as a result of military base closings & these will last 2 years or even more in a DR. Stock up while you can - prices are typically $40/matched pair. Perhaps Svetlana will come out with a good 6V6GT, but right now, large scale manufacturers like Fender are stuck with the Russian & Chinese versions. Newsgroups: rec.music.makers.guitar Organization: MCSNet Services From: "Teleologist" Subject: Re: Deluxe Reverb: reissue vs. original...opinion? Date: 3 Mar 1997 15:48:32 GMT Giri Iyengar wrote in article <5felkq$rp52@eccws1.dearborn.ford.com>... >> > alt.guitar.amps are raving about them. Check out the WeberSVT web page. > > This is good news, indeed. What's the URL? > Sorry that should be WeberVST http://www.webervst.com Newsgroups: rec.music.makers.guitar Organization: PANIX Public Access Internet and Unix, NYC From: mgarvin@panix.com (Mark Garvin) Subject: Re: Impedence Question Date: 27 Feb 1997 07:19:14 -0500 In <3314c54b.837050@news.dave-world.net> beezwax@gridley.org (Chris) writes: >Ok, I usually just plug into my little combo and don't worry about >anything, but I'm curious about impedence. All I know is it has >something to do with resistance and than matching a cabs impedence >with a head's is important to not damage the head. I also heard that >it's ok for the speaker cabs impedence to be higher than the head's >impedence, just not lower. Could someone tell me if this is correct? >Also, how do multiple speaker impedences add up. For example, do two >4 ohm speakers in a cabinet make it an 8 ohm cabinet? Whether the amp will work with a mismatch depends on the amp. Plugging another speaker into the Fender ext. speaker jack will cut the impedance in half, and Fender does not warn against it. Doesn't mean that it's always OK, though. Mismatching with higher speaker impedances cause a different set of problems than mismatching lower. Higher can toast output tubes in an amp with no 'screen resistors' (like a Fender Champ). Or the worst case: if you forget to plug a speaker in, you can cause internal arcs due to 'flyback' effects. The arcs can damage transformers or output tubes etc. Sorry if that adds some confusion. Bottom line: try to get close to the rated speaker impedance. MGarvin