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Compression Driver Protection Circuit

This publication was my bible when I built my Altec 12" 414, 806/811, EV T350 20 years ago. To participate you need to register. At that time it was a princely sum because the woofers were $80 each. Logged Don't bring up facts that can ruin our good argument.Crown i-Tech 8000Allen & Heath ZED60-14FX4 X Cerwin Vega ProStax PS-12 II1 X Cerwin Vega Sub 151 X Rolls RS-80 Tuner1 http://fallbrookpcusersgroup.org/compression-driver/compression-driver-light-bulb-protection-circuit.html

Top Display posts from previous: All posts1 day7 days2 weeks1 month3 months6 months1 year Sort by AuthorPost timeSubject AscendingDescending Post Reply Print view 2 posts • Page 1 of 1 Return If the speakers are not up to the task, sell them and move on to something better.+1 , jbl diaphrams will last as long as you dont overpower them. It is used for compression driver protection. R1 is permanently in series with the speaker which will reduce the power by 1/4 and can't be good for the damping factor. https://peavey.com/forum/viewtopic.php?t=13169

By using this site, you agree to the Terms of Use and Privacy Policy. Frondelli dBm Pro Audio Services, New York, NY "Mediocre is the new 'Good' " Reply With Quote 04-22-2010,10:28 PM #7 g1 don't forget the joker Join Date Feb 2010 Location Canada, He suggested to protect a 50-60w driver, one would need the following: A Polyswitch, Pt.# REX110, a 2.2 ohm 15w resistor, and a #1156 automotive lamp. Please consider donating to help us continue to serve you.

PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk Nigel Goodwin, Mar 31, 2010 #5 Hero999 Banned Joined: Apr 6, 2006 Messages: 14,902 Likes: 79 Location: England Nigel Goodwin said: ↑ It's If you download the yorkville speaker component chart, they show the different wattage auto bulbs available, mostly under the older elite & pulse series. I want to put something similar in a Yamaha club4 monitor i have. In any biamp set-up it is good practice to have a capacitor in series to keep any DC from turn on thumps out of the compression drivers.

Hero999, Mar 31, 2010 #6 Nigel Goodwin Super Moderator Most Helpful Member Joined: Nov 17, 2003 Messages: 38,851 Likes: 609 Location: Derbyshire, UK Hero999 said: ↑ Yes, I suppose it makes Hero999, Mar 31, 2010 #3 Dave New Member Joined: Jan 12, 1997 Messages: - Likes: 0 Dave, Dec 11, 2014 #3.1415 Gary B New Member Joined: Nov 4, 2009 Messages: Not a problem on a high frequency unit like this, only on bass units. No, create an account now.

tvtech, Mar 31, 2010 #9 audioguru Well-Known Member Most Helpful Member Joined: Mar 16, 2004 Messages: 32,216 Likes: 917 Location: Canada, of course! Page 1 of 10 1 23 > Last » « Previous Thread | Next Thread » Thread Tools Enhanced Print View Regular Print View Search this Thread Advanced Search Posting Rules It looks like,from the earlier discussion that less volts = less resistance. This amp seems louder than the 300 watt power amp i used before.

I have been a JBL user for a few decades and have had to change very few diaphragms, three that I can think of, and two of those were damaged by http://www.electro-tech-online.com/threads/compression-driver-protection.105492/ Originally Posted by Justin Thomas In my ideal world, I'm not too loud - your room is too small! Reply With Quote 05-16-2007,10:00 AM #2 Robh3606 View Profile View Forum Posts Administrator Join Date Apr 2003 Location Destiny Posts 7,578 With the 4430/35 crossover it's not just a protection capacitor This was with a 300 watt solid state power amp.

The suppression technique of Smith has been recently extended [7] using a more accurate analytical acoustical model of the compression driver geometry. http://fallbrookpcusersgroup.org/compression-driver/compression-driver-manufacturers.html Reply With Quote 04-26-2010,10:36 PM #13 chipprogr Member Join Date Jan 2010 Posts 70 Originally Posted by Scorpion The crossover i'm using is modelled (rev engineered) after the yamaha club where The Polyswitch is in series with the driver hot lead, and the series of the lamp and resistor is in parallel with the Polyswitch. Doesnt matter how "secure" you think you have your coin box, given enough effor, the crooks WILL break in to it.

That is the hard part.If you use something to large-it won't protect.If you use something to small-it will "kick in" to soom or burn up all the time.The use of simple Surely it has resonance to? Fair enough it might not be noticeable but wasting half the power isn't a good thing, the listener will just turn the treble up a bit causing the amplifier to work his comment is here I used lamps (larger than would normally be used) in series (as normal) with the load.

In-line fuses work also, but are highly-inaccurate due to their tolerances, and I've seen too many drivers cook BEFORE the fuse. Last edited by RKLee; 05-16-2007 at 01:38 PM. but maybe wait for confirmation Reply With Quote 05-16-2007,11:35 AM #6 RKLee View Profile View Forum Posts Senior Member Join Date Mar 2007 Location Los Angeles, Calif USA Posts 183 ?

They found that the bandwidth of the transducer could be extended to higher frequencies using their phase plug.

The Journal of the Audio Engineering Society. 25: 573–585. I had .25amp fast blow automotive fuses in series with the woofers, but they just weren't fast enough. $10 for some capacitors is good cheap insurance to protect $100+ diaphrams. Corp(SWTP) they were really know for their computers than amps, Ft Worth TX; and one failed. Forums © ProSoundWeb SMF 2.0.13 | SMF © 2016, Simple Machines XHTML RSS WAP2 Page created in 0.27 seconds with 19 queries.

There is another note I can't find that showed adding a lightbulb across the relay contacts. The time now is 12:15 PM. The size of the capacitor needs to be large enough to be " not in play " at the crossover frequency. http://fallbrookpcusersgroup.org/compression-driver/compression-driver-wharfedale.html It is attached to an acoustic horn, a widening duct which serves to radiate the sound efficiently into the air.

palesha New Member Joined: May 21, 2003 Messages: 25 Likes: 0 I have seen the circuit attached is used in crossover. This is to amplify a digital Hammond organ. While it is only a 1A relay, it can handle 5A with a lightbulb across itself. R.; Slepian, J. (September 1977 (originally published 1924)). "The Function and Design of Horns for Loudspeakers (Reprint)".

I was sending out 4-5 systems per day on the weekends. Last edited: Mar 31, 2010 Fun and games are over. So many variables here that the blanket statment they posted just isnt the complete story. I have a bi-amp speakers, and I don't have this capacitor wired into my system.

This is where alot of the "meat" of many musical instruments' sound lies. They also outlined criterion for the design of the channels in the plug and suggested a path-length based design approach to maximize the bandwidth. Well the fuse is still good ." Reply With Quote 04-25-2010,04:57 AM #9 chipprogr Member Join Date Jan 2010 Posts 70 Originally Posted by Scorpion , in series with the driver. So I took a scope (you know real test gear) and looked at the signal across the driver.

Reply With Quote 04-22-2010,10:00 PM #6 jrfrond Old Timer Join Date Apr 2008 Location Oceanside, NY Posts 1,649 Bulbs are common and provide a measure of compression. Reply With Quote Quick Navigation Lansing Product Technical Help Top Site Areas Settings Private Messages Subscriptions Who's Online Search Forums Forums Home Forums Lansing Product Forums (JBL, Altec, LMCo) Lansing Product This seems like a bad idea, a DIAC and potential divider should be used instead of D1 to D4, the TRIAC should short the speaker directly and R1 should be a Since they are not drawn as zener or avalanche breakdown types, it is going to short out permanently on about the second or third cycle.

Here's a discussion from the their web site: Acme Sound Ltd. Last edited: Mar 31, 2010 I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong. Just my .02I've been using the same selenium driver except the neodymium model (uses the same diaphragm) in my home brew 2-15 mains for about 3 years with no problems. The ST-350 were famous for blowing out when that happened.