http://techtalk.parts-express.com/ en Sun, 26 May 2013 02:06:20 GMT vBulletin 60 http://techtalk.parts-express.com/images/misc/rss.png http://techtalk.parts-express.com/ http://techtalk.parts-express.com/showthread.php?237680-Subwoofer-Configuration&goto=newpost Thu, 23 May 2013 15:44:00 GMT This is kind of a hypothetical question regarding advantages of different subwoofer configurations - specifically number and placement. I was... This is kind of a hypothetical question regarding advantages of different subwoofer configurations - specifically number and placement. I was reading one of BFM's papers on subwoofer placement, and wondered how much of it was specific to horns vs regular ol' direct radiating cabinets.


Assumptions:
-all configurations have the same free air max SPL output and same frequency response
-cost is the same for each configuration
-required amplifier power for max output is the same for each configuration
-all configurations use similar "quality" drivers (i.e. just different capabilities, not radically different quality)
-for now ignore the size difference/pack space


The question is... is there an inherent advantage to having multiple speakers, even if their Max SPL capability isn't any higher than a single driver box?

A) Single "high performance" sub
B) Dual (two singles, or a 2x cab)
C) Quad (4 singles, or dual 2x)

In Bill's write-up, there's discussion of multiple drivers helping to flatten response, and at least in the case of horns it can extend the low frequency extension. Do any of these traits also apply to BR cabs? Do you get any additional benefit from wall/corner loading with multiple drivers that you don't get with a single? I see most people tend to suggest clustering subs to reduce phase issues... does having multiple subs compound that problem?

Like most of us, I've got a budget, and I'm trying to decide if (from a performance standpoint) it makes more sense to build one sub using e.g. a $400 driver, or two subs using $200 drivers, or 4 subs with $100 drivers, etc. (or do I just bite the bullet and build horns?) ]]> Pro Audio / Live Sound Reinforcement Jason http://techtalk.parts-express.com/showthread.php?237680-Subwoofer-Configuration http://techtalk.parts-express.com/showthread.php?237585-Gallien-Krueger-SE2100&goto=newpost Thu, 16 May 2013 04:38:33 GMT Hello, I am new to this forum and I was wondering if anyone can help me with my problem. As shown from the title I have a Gallien-Krueger CEL2100... Hello,
I am new to this forum and I was wondering if anyone can help me with my problem. As shown from the title I have a Gallien-Krueger CEL2100 guitar combo amp. It has 6.5 inch speakers rated for 100 watts, the problem is they are rated for 16 ohms. Does anyone know of a replacement speaker? Sorry for the type O! ]]> Pro Audio / Live Sound Reinforcement School of Tone http://techtalk.parts-express.com/showthread.php?237585-Gallien-Krueger-SE2100 http://techtalk.parts-express.com/showthread.php?237568-PA-system-rebuild-project&goto=newpost Tue, 14 May 2013 23:32:05 GMT Hello all
I'm new to this forum, a drummer and retiree that is looking into rebuilding my old p.a. speaker system. I have spent the last few months researching various design concepts and speaker components. My plan is to use my old pair of dual 15" Martin bass horns as subs for the time being with newly added mid-bass/high units for use in small to mid-sized environments.
Important objectives include lightweight modular units with good loudness and fidelity, requiring minimal processing.
I'm no audio expert but have designed/built some speaker boxes and believe I know enough to learn enough to come up with a good system that meets my needs.
And my budget is looking good.

Ever since I saw the Shindogs (house band for the mid 60's live music t.v. show "Shindig") play a local gig, using a pair of vocals-only JBL p.a. columns (each 4x10" w/two bullet tweeters), and after building my own cheap version (4x10" Utahs w/whizzer cones, no tweeters), I've been into the line source idea ever since. I know the point source concept has it's advantages (not the least being relative simplicity) and I now have some components, but the line idea is for me.

The key will be the high frequency section. I've read a couple of times that the planar lens waveguide is the greatest advancement in sound reinforcement theory to come along in the last few decades -- maybe so. I believe they are superior to various conventional types of tweeters, solving some basic line wave problems.
But I have run into problems trying to design them into trapazoidal line array boxes, so if I go with line arrays it probably won't include planar lens horns, unless I can be convinced otherwise. But I'm also not completely ruling out conventional tweeters -- that's still a possibility. My desire, though, is to incorporate a planar wave high end system.

Another option would be the ribbon line element, but I'm not sure that they are suitable for portable sound
systems. Lately the B-G 8" and 10" neo ribbons are hyped as now having more durable and higher performing diaphrams that makes them appear as a more attractive option than before. Being a shallow depth element, they would be easier to design into a trapazoidal box with a front-mount woofer.

The Paraline would be ideal, but after a phone call to VTC I know that they would not be available to me (unless I bought them as part of manufactured speaker boxes). And of course I've considered the synergy/unity horn - nice, but not quite right for me - costly to buy, tricky to make.

One of my biggest obstacles about deciding which way to go for high end is that I don't know how some of these components sound, particularly the ribbons. How do they sound in comparison to, say, domes (and I'm sure there's different sounding domes)? And does the planar waveguide horn lens have a good sound?

I have looked at the response curves of the B-G ribbons - not very flat.

There's also the question about crossover points relative to the vocal range, and how that relates to speaker configuration. Three-way units might be a bit much, two way more reasonable with a crossover around 1k (not the best for the vocal range)?

Although the woofers are important they will be a little easier to decide on. I'll be looking at using either 6.5s, 8s, or 10s. If I go with line arrays w/ribbon drivers, either 8s or 10s. I'm going to want woofer systems that will be able to carry some bass drum in a small setting (without needing subs). 10" woofers crossed at about 600 hz (for acoustic coupling) with 10" ribbons could be a nice combo for that, but enough 6.5s might do it, too.

Or I could just forego all this work and purchase something manufactured, such as:

the TOA HX-5, maybe eight units, mini line array http://www.toa.jp/products/pro_speak.../hx-5b-wp.html

the JBL CBT70J-1 + CBT70JE, pair, curvilinear line source http://www.jblpro.com/catalog/genera...?PId=419&MId=2

the CBN 6685, 4 units, ribbon line source
http://www.ribbonloudspeakers.com/

I know the TOA and JBL products use dome tweeters, not my preference, but do they perform well? They might spec out ok for loudness. That's something I don't know -- what can they handle?
I'm sure there are other great products out there.

Right now I'm leaning toward a modularized (small stackable modules) line source (column) system for ease of setup/use. I prefer the line array because of dispersion and wave control adjustibility.

Any thoughts out there? ]]> Pro Audio / Live Sound Reinforcement DrummerLikesSpeakers http://techtalk.parts-express.com/showthread.php?237568-PA-system-rebuild-project http://techtalk.parts-express.com/showthread.php?237546-Design-For-12-quot-Guitar-Cabinet&goto=newpost Mon, 13 May 2013 13:24:35 GMT I want to build a portable one or two 12" speaker cabinet for my son. He currently has an Avatar 4x12 cab with a separate Marshall 100 watt head (solid state w/ tube preamp).

Where is a good source for different cabinet designs and general guidance? Not sure if we want open back, closed back, which guitar driver, etc...... he plays hard rock.

Thanks.... ]]> Pro Audio / Live Sound Reinforcement zhillsguy http://techtalk.parts-express.com/showthread.php?237546-Design-For-12-quot-Guitar-Cabinet http://techtalk.parts-express.com/showthread.php?237531-Using-phantom-power-and-setting-trim&goto=newpost Sun, 12 May 2013 17:53:42 GMT I'm using a Europower PMP6000 powered mixer and I want to know about using phantom power in general, and specifically can you use it with a combination of condenser mics and regular mics. I know phantom power is used with condenser mics

Phantom power can't be turned on channel by channel and is needed for condenser mics but I don't know if it hurts the other mics or instruments. Help!

Second question is about trim: I think I remember reading that you're supposed to turn the trim up with a signal going in until the light stays on in order to find your proper setting. However, I have a friend who believes you should turn down on the trim until the light only blinks on peaks. Which is right?

Thanks! ]]> Pro Audio / Live Sound Reinforcement TroyKC2065 http://techtalk.parts-express.com/showthread.php?237531-Using-phantom-power-and-setting-trim http://techtalk.parts-express.com/showthread.php?237454-Sound-in-gymnasium&goto=newpost Tue, 07 May 2013 23:09:36 GMT i'm trying to set full band sound in a gymnasium (think bouncing basketball in an empty gym — whap whap whap), very echoey and muddled. Is there anything i can do with physical setup or PA settings to improve sound quality? We do have an elevated stage.

Thanks,
Troy ]]> Pro Audio / Live Sound Reinforcement TroyKC2065 http://techtalk.parts-express.com/showthread.php?237454-Sound-in-gymnasium http://techtalk.parts-express.com/showthread.php?237445-B-amp-c-tbw100&goto=newpost Tue, 07 May 2013 13:30:10 GMT Will it work in a MHB-4818 .and will gain Db,s over a BR ? Will it work in a MHB-4818 .and will gain Db,s over a BR ? ]]> Pro Audio / Live Sound Reinforcement sn95 http://techtalk.parts-express.com/showthread.php?237445-B-amp-c-tbw100 http://techtalk.parts-express.com/showthread.php?237360-1-4-vs-2-in-mid-high-frequency-horn-drivers&goto=newpost Wed, 01 May 2013 00:40:59 GMT I am helping a friend build a high output box and we are concerned the 1 inch mid high drivers won't deliver enough SPL. The idea is to come into the horn around 1-1.5 KHz. Using the larger driver, do I need to integrate a HF horn in the mix? The intended use is a dance club PA cab that is capable of delivering a hi fi output. Thanks in advance for any words of wisdom. ]]> Pro Audio / Live Sound Reinforcement kblackmore http://techtalk.parts-express.com/showthread.php?237360-1-4-vs-2-in-mid-high-frequency-horn-drivers