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Speakerplans.com Forums http://www.speakerplans.com/forum/ This is an XML content feed of; Speakerplans.com Forums : Last 10 Posts Copyright (c) 2006-2008 Web Wiz Forums - All Rights Reserved. Fri, 29 Aug 2008 09:19:36 +0000 Fri, 29 Aug 2008 09:13:14 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 9.51 30 www.speakerplans.com/forum/RSS_topic_feed.asp Speakerplans.com Forums http://www.speakerplans.com/forum/http://www.speakerplans.com/forum/forum_images/splans.gif http://www.speakerplans.com/forum/ General Forum : Is it me or is my rig getting louder? http://www.speakerplans.com/forum/forum_posts.asp?TID=19309&PID=188612#188612 Author: boycey
Subject: Is it me or is my rig getting louder?
Posted: 29 August 2008 at 9:13am

+1

had mine out a few weeks ago and it sounded much louder than previously. a feller who does sound engineering at mass has been coming along to all our nights at a certain south london venue, previously he's told me that the sound needs more bass/top... last time he told me to turn it down Big%20smile

]]> Fri, 29 Aug 2008 09:13:14 +0000 http://www.speakerplans.com/forum/forum_posts.asp?TID=19309&PID=188612#188612 New Projects Forum : SMT 212 w/ Build pics. http://www.speakerplans.com/forum/forum_posts.asp?TID=19306&PID=188611#188611 Author: eltron
Subject: SMT 212 w/ Build pics.
Posted: 29 August 2008 at 9:11am

Now you are ready to go round the whole cab with your router with a round over bit installed. You don't have to make a big round over, around 6 mm (1/4") is good. Any more than this and you will be hitting the screws. Rounding over gives a very professional finish to a cabinet and is easy to do. If you don't own a router make it the next thing you buy.

Quoted from the Speakerplans.com build guide by rog. In that case the example build was 18mm MDF.
]]> Fri, 29 Aug 2008 09:11:52 +0000 http://www.speakerplans.com/forum/forum_posts.asp?TID=19306&PID=188611#188611 Amp Forum : amusing sidetrack http://www.speakerplans.com/forum/forum_posts.asp?TID=19314&PID=188610#188610 Author: Deadbeat
Subject: amusing sidetrack
Posted: 29 August 2008 at 9:11am

Nuforce ones are overrated imo, but there are some brilliant class d products for use in hifi.
This:
http://www.diyaudio.com/forums/forumdisplay.php?forumid=49
Is a good starting point, and there aren't any of your typical $$$$$ golden nob audiophools around there. Just like minded (skint) enthusiasts...but you knew that already.

Class D is doing pretty badly over in this market segment. Probably due to the flood of cheap crap.

PS

Andy, have you tested the Hypex UCD 700?

I too wish FFA luck in polishing the reputation of this class of amps.
]]> Fri, 29 Aug 2008 09:11:13 +0000 http://www.speakerplans.com/forum/forum_posts.asp?TID=19314&PID=188610#188610 Other plans : 15" lowmid horn http://www.speakerplans.com/forum/forum_posts.asp?TID=19276&PID=188609#188609 Author: bitzo
Subject: 15" lowmid horn
Posted: 29 August 2008 at 9:07am

I see, thanks deadbeat, very helpful at all. Could I make a question slightly off topic?
I built the voice of theatre but I modified it. I reduced the throat size do 400 cm2 adding curve section on the upperside and on the down side, and I reduce the rear chamber to 32 litres.
What do you think about this modification?

Edited by bitzo - Today at 9:08am]]> Fri, 29 Aug 2008 09:07:30 +0000 http://www.speakerplans.com/forum/forum_posts.asp?TID=19276&PID=188609#188609 Amp Forum : amusing sidetrack http://www.speakerplans.com/forum/forum_posts.asp?TID=19314&PID=188608#188608 Author: adambomb
Subject: amusing sidetrack
Posted: 29 August 2008 at 9:06am

I know a locally based speaker cable manufacturer.. they sell all the super flashy £100s per meter cable that get reviewed in all the audiophile mags etc...

I was talking to him about the business.. he didn't know I was into audio...

Fact is... all the cable is made in china, they just come up with new ways to make it look nice (differing plastic / braiding the cable / extra bits of copper in the cable etc etc).. and flog it for as much as they can.. he said the margins are just stupid.. makes loads of money from it and KNOWS that none of the cables make a blind bit of difference to the sound.

It's all about marketing... infact that's what he said.. it's more of a marketing company than a cable company.

Funny stuff.

To me, once you have a good amount of mm2 good quality copper the rest is just marketing.

]]> Fri, 29 Aug 2008 09:06:50 +0000 http://www.speakerplans.com/forum/forum_posts.asp?TID=19314&PID=188608#188608 Newbie Discussion : bouncing a PD186 off the Xmax or Xmech. http://www.speakerplans.com/forum/forum_posts.asp?TID=19299&PID=188607#188607 Author: _djk_
Subject: bouncing a PD186 off the Xmax or Xmech.
Posted: 29 August 2008 at 8:50am

I ran a PD186 in BassBox v6.0, with the box recommended for maximally flat response (4.3 cu ft per driver, Fb=32hz, F3=45hz), x-max is reached with 800W per driver at 52hz.

A 5 cu ft box per driver tuned to 40hz with a 12dB filter at 40hz with a Q=.9 has about 3dB more output in the 55hz region (peak output frequency on typical dance music) before x-max, and is 3dB down at 41.8hz.

]]> Fri, 29 Aug 2008 08:50:10 +0000 http://www.speakerplans.com/forum/forum_posts.asp?TID=19299&PID=188607#188607 Amp Forum : amusing sidetrack http://www.speakerplans.com/forum/forum_posts.asp?TID=19314&PID=188606#188606 Author: andyamp
Subject: amusing sidetrack
Posted: 29 August 2008 at 8:34am

all the class D amps I have sound tested have been complete junk,
now before i put them on the test bench i clean the floor so i do not get dirty when i fall of my chair with laughter. LOL

any one that wants to test there amps "bring them here"

I have not tested the FFA amp and i hope for good things Thumbs%20Up

]]> Fri, 29 Aug 2008 08:34:03 +0000 http://www.speakerplans.com/forum/forum_posts.asp?TID=19314&PID=188606#188606 Other plans : 15" lowmid horn http://www.speakerplans.com/forum/forum_posts.asp?TID=19276&PID=188605#188605 Author: Deadbeat
Subject: 15" lowmid horn
Posted: 29 August 2008 at 8:32am

Remember, when you click 'calculate' on hornresp, it only describes the power response of the horn! Not taking into account driver response, which on certain designs increases the HF ability of any given horn. Plug in an Altec A7 and you will see that....hey, the frequency reposne is crap! It don't go high as it's rated! What were they thinking! Well, measure one and you will see why they rated them to go with the compression drivers straight up. I'm not sure whether 'combined reponse' can do this...

On modeling plugs - a simple thought exercise is to design your horn with the high compression ratio, then split the throat apart keeping the same area in the cross section, if you know what I mean.

Well, if you look at the issue of making a front loaded horn cab go high enough, there are two ways. The first way is to compression load the driver, with a phase plug. Nowadays, with the cone strength of today's speakers, this is a viable option, though as you may well have noticed, it is not so in older designs:
Figure A, a Funktion 1 Res 4, using one of the later phase plug designs, even the folded horn is plugged:

There's also the other well accepted way, which is to make a very large throat that combines the driver response WITH the speaker response. You may have noted my earlier statement about this, and realise that even if you make the throat much bigger in hornresp, it still looks crap. I'll repeat it again - that button calculates horn response.

Now, the reason why these older cabs don't use the fancy new method of plugging a horn is simple - the drivers just couldn't stand up to it. Not at all. Build a high compression horn with that driver and it will rip from it's surround with 250W.

So. you are really looking for something like this:

Don't mind the HF (apart from the direct xover to the comp), and concentrate on the woofer section. It is very large. Now simulate it in hornresp, there are plans on the net. What? It's a piece of crap! Not so...

I suggest you try a throat size of...128 square inches. This is calculated from the above plans:
http://www.lansingheritage.org/html/altec/plans/1968-plans.htm
]]> Fri, 29 Aug 2008 08:32:19 +0000 http://www.speakerplans.com/forum/forum_posts.asp?TID=19276&PID=188605#188605 Other plans : 15" lowmid horn http://www.speakerplans.com/forum/forum_posts.asp?TID=19276&PID=188604#188604 Author: bitzo
Subject: 15" lowmid horn
Posted: 29 August 2008 at 8:03am

uhmm no.... the main concept is the substract the areas of the horn with a smaller throat from the area of the bigger throat. But not from the sides to the center (hornresp model in this way) but from the center of the throat to the sides. In other terms if the green areas is equal to the blue one you're right

but the plug that you model is too fat...if you want a shape like that you have to model 2 segment and the lenght from s1 to s2 will be the lenght of the plug, otherways in my first example the lenght of the horn is equal to the lenght of the plug.
I hope I'm more clear.

cheers, bitzo

Edited by bitzo - Today at 8:12am]]> Fri, 29 Aug 2008 08:03:09 +0000 http://www.speakerplans.com/forum/forum_posts.asp?TID=19276&PID=188604#188604 Amp Forum : Poor Power = Clip Sooner? http://www.speakerplans.com/forum/forum_posts.asp?TID=19310&PID=188603#188603 Author: roborg
Subject: Poor Power = Clip Sooner?
Posted: 29 August 2008 at 7:08am

Originally posted by andyamp

there is a program on the discovery channel about when the welsh electric mountain hydro electric generator that supplies the peek power demand for the uk's electricity is used.
they say that at half time in big foot ball finals and the world cup millions of kettals are switched on during the commercial Big%20smile

so yes

I was in one of the welsh jobs at Ffestiniog when it was time to deliver. I watched one of the 2ft thick turbine shafts spin up, delivering about 100MW constantly (yeah 100000000 Watts RMS hehe, we're not talking PMPO here!) going thru it, i kinda didn't think about a cup of tea

Everything was shaking, concrete, steel, the air, me (but mainly out of fear hehe) You wouldn't have any clippng problems there if your 125A distro board was plugged into what was underneath me. defo go to one of these places if ur nr by them some day, your biggest power amps & speaker stack will seem like an amoebas fart compared to the roar of hydro-electric turbines kicking out some juice

]]> Fri, 29 Aug 2008 07:08:27 +0000 http://www.speakerplans.com/forum/forum_posts.asp?TID=19310&PID=188603#188603