Marvel
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Posts posted by Marvel
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Moon,
I've cleaned it up a little bit more, and have one at 1024x768 (black bars on each side as original was square). I'll post or email it to you if you want it for wallpaper.
Marvel
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Moon,
This is just for you!
Marvel
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I have about a pound of Flooby Dust in my shop. I could sell you some, but it is very hard to ship. That's what makes my upgrades sound so good.
Marvel
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C&S,
Could you not download the file or just not open it? With a.pps extension, it sounds like a PowerPoint Show. What is the full link to it?
Steve,
I only know from reading and talking to a bunch of recording engineer folk that the Pultec is supposed to be a VERY transparent piece of gear, albeit pricey. You can set the width of the boost or cut, as a parametric eq. All very smooth sounding.
Marvel
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JM,
As I have pointed out to a couple of folks who have emailed me, I don't even have a pair of LS yet. I'm working on that. I DO know that djk has come up with all sorts of mods, and I DO know that his stuff sounds very good. I have heard a set of some LS clones he built back in the '80s. I am more than willing to try what he suggests, I just don't have anything to try it on yet. I figured I could at least make the drawings and make them available. He says he has done this mod, and I have no reason to doubt him.
Marvel
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Read DJK's repsonse to the question here (this started it):
His short answer is yes.
Marvel
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djk,
Yup, the 50Hz on the trannies would be about the same as running a motor slower. I iamgine it would heat up a lot. No wonder my JVC poewr tranny is so big, considering it is only a 30 wpc amp.
Have you seen the LS mod drawing I posted (updating older speakers)? People would like some feedback on results, if you could post some. They aren't all Luddites.
Marvel
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My thirty year old JVC integrated (sweet amp, still works) has a jumper block under the cover next to the power transformer to switch from one to the other. But then, this amp has some things mounted on removeable plug in cards, making it far more modular than most stuff even today. The sill thing cost $300 in 1972!
Marvel
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Below is what djk had posted on the Audio Asylum forum quite some time ago. I was hoping he would post on this. His final "fix" is to open the doghouse on the top side, right under the mid horn if you will. Close in the back and put these ports in it. Don't forget to fill with fiberglass or equivalent material. There are four (4) things he says you can do.
1. just open the space to increase relative size of doghouse.
2. add ports to that
3. 2 plus change to K43
4. 2 plus change to jbl or ev (requires crossover mod as well
Here is his text. He has done these mods, and yes it does make it a bass reflex with a horn. It also seems that with the weight of the LS, if you put some gasket material around the opening of the mod, you might be able to just place your cabinets on top. 123 lbs. is pretty heavy and might seal well enough to try out:
The taper rate of a LaScala is 100hz,The mouth area is good for 125hz.Below this it is a big woofer in a small sealed box.If we plug the T/S parameters for the K33E into a box program we will see that the Qtc=.85, the Fc=82.5hz, and the F3=70.9hz . If we close in the back of the high frequency cabinet and open the woofer rear chamber up into this volume and fill with fiberglass we now have Qtc=.577, Fc=58.2hz, F3=73.6hz .Bessel=Qtc.577=D2 gives the best transient response and the least group delay of all the sealed boxes.At 30hz the Qtc=.577 has 4.5dB more output than the Qtc=.85 .Compared with sealed enclosures,the transient performance of the best vented enclosure is worse than the best sealed box enclosure.Since we have made great gains in performance some may elect to stop here.But please read on.The next step is to port it.The K33E is not the optimum woofer for this but it works pretty good.With the box size optimized for a D2 we can port the stock woofer to an SC4.The transient response of an SC4 while not as good as an SBB4(more on this later)is better than the more common QB3.Unequalized the F3=49hz and has 3dB more output at 30hz than the D2.The response curves are parallel with the D2 the only difference being the Fc being a half octave lower with the SC4 and the output being 3dB higher from 30~70hz.The output of the SC4 does not drop lower than the D2 until you go below 17hz.Again this may be a stopping point for some.But by adding a simple two pole high pass filter ahead of the power amp we can now have a C6 with a -3dB point of 31hz.Since this is the Fb of the system there is no increase in cone excursion or distortion.The filter consists of a cap an inductor and a pot.The pot allows adjustment at Fb of +/- 3dB.This is similar to being able to change the Qtc of a sealed box from .5~1.0 .If you think about it we have the choice between a D2,SC4,and a C6 in the same box by plugging the port and/or bypassing the eq.If you have a SET amp or simply want to get the most out of the LaScala you will want to upgrade the woofer to something with a lower Qts.The Klipsch K43E does the trick,as do the EV DL15W and the JBL 2205.The EV and JBL drivers require some minor network changes.The lower Qts drivers allow for an SBB4 alignment which has the best transient response of the vented alignments.With no eq they have 3dB more output at 30hz than the stock woofer.With eq we have a maximally flat B6 and the F3 of the system is 27~28hz.If using a solid state amp with the low Qts woofers a small resistor must be added in series with the driver to have the same Rg as the SET does.This mod can be backed out of a stock LaScala with no externally visible changes if you don't like it.No one has ever gone back to stock after hearing this mod.Paul Klipsch was violently opposed to the venting of horn speakers bassed on his experience with venting the K-horn.In retrospect it is easy to see why.The 12" Jensen field coil woofer he was using had an Fs of 60hz and a quick calculation of the vent area vs the Vb based on the photographs of this experiment looks like an Fb of ~80hz.I am sure this sounded horrible.Paul Wilbur Klipsch is a giant in audio.If I appear to see farther than PWK it is only because I am standing on his shoulders.
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Gil,
You are absolutely correct on the panic this must cause the marketing department. Some things I buy I know are throwaways, so it doesn't bother me to go to a cheap retail store. Some things you know won't break, so the same thing. It all gets down to service. You can't have really nice listening rooms and be pushing the $100 speakers. You wouldn't make money. I would hate to take something back to a mass market retail store that was broken and needed work. Not much different than buying off Ebay.
Marvel
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Since I don't even have a set of LS yet, it doesn't matter to me, but as djk has pointed out:
The flare rate on a LaScala only carries it to 100 Hz. Below that it is a woofer in a sealed box. People have asked, so he gave details. If you already have the LS and like them, why not try it. This is 100% reversible. No wonder he said that PWK would call some of you Luddites. Is it heresy to do all the other mods on PWK designs? Apparently not. I especially like John Warren's removal of the mid horn for his Khorns, and replacing them with the two JBL direct radiators. Very cool. djk says you can get more bass at 30Hz from these cabinets than frm a KHorn. If I had a pair right now, I would be willing to try it and see if he is correct.
Terry,
I used trueSpace for the drawing. My youngest son bought it a few years ago. Last year he switched to Lightwave, so I appropriated it as LW is far better for what he is doing (3D animations and rendering). The version we still have is TS 4.3, but it is now up to 6.0. For what I'm doing, the 4.3 is just fine.
Four Cornwalls would cost a lot more than making these bottoms for a pair of LS. You could make them very cheap to try it out. I have other sketches to mount the ports, so they could easily be removed or modified.
Marvel
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Here is the drawing for lowering the bass frequencies output of the LS. This is ten inches tall, making the inside 8.25 inches. The two tubes/ports are PVC pipe, with a 4 inch inside diameter, 10 inches long. The bottom of this needs to be removeable. If you remove the bottom from your LS (use the cover to mark the holes for attaching the new extension) and attach to LS. Stuff with fiberglass or acoustic fiberfill. Attach bottom. Hopefully enjoy lower bass.
I hope djk will post with expected results. I won't try to pull the details out of his posts on Audio Asylum. I think that with the K33 and this, it will go low and solid. Switching to the K43 does even better. Any other speaker (EV DL15W) requires crossover changes as well. If you like this, you can remove this design and cut a hole in the top of the doghouse of the LS and close in the back with ports added. Will do the same thing but drop the height back to normal.
Marvel
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I'm just glad that I still have my 4311s to mix on. They were expensive enough when I bought them in 1972 ($329 ea). But I have been able to do mixes that have moved well from one playback system to another over the years. Even a pair of 4412s would still be nice to have.
Marvel
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You should really have all the parts, including the transformers, together to lay out the design before you build the box to put it in. With all due respect, it looks like you are going about it backwards.
Marvel
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While out picking up a router for our DSL connection today, my youngest son and I stopped by the Tweeters in Chattanooga. They still have some Klipsch on display in big rooms. They have some KLF10s for $599. Mostly smaller stuff, like the SB 1, SB2. At least there you could hear what was being played. At Best Buy, there was so much other noise you couldn't tell much difference between the Klipsch and the Sony or Yamaha gear. Really too bad. A big warehouse room with everything turned on is no way to pick speakers.
Marvel
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A close friend of mine worked for the DNR in Georgia a few years ago (quite a few, now that I think about it). He ran an old historic site south of Savannah, at Midway (I think). They had a new museum on one side of the road, and an old cemetary on the other, surrounded by a brick wall, supposedly built with slave labor. We are taliking about a really quiet place. One day a family stopped by and visited the cemetary. After wandering around for awhile, they came into the museum/gift shop and were asking about the area and other sites. The young son pulled on his dad's arm and asked him to ask my friend about the music. The guy says, "Oh, yeah, we were wondering how you got the music to play over in the cemetary. We couldn't see any speakers anywhere." My friend Roger told them that they didn't pipe in music over there and that they didn't have speakers. The family didn't really believe him. He had a couple more incidents like that, one concerning a church built in the late 1700s. It can be a weird area, with people professing to be Christians, and still going out to see their Witch Doctors at night.
I know quite a few missionaries from different denominations, the denominations of which don't really believe in the demonic side of the supernatural. The missionaries didn't either, until they got out into some of the areas in the world away from TV and all of our sciences.
Even if I had a few million to play with or throw away, I wouldn't ever consider getting the Ghost in a Jar.
Marvel
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...and he was so kind to refrain from saying that MP3s actually suck for quality audio playback. Compressed vs. uncompressed should be a no-brainer, but we do always want something on the cheap (I do). It just depends on whether or not we are will to accept the downsides of it all.
Dave,
Years before people came along with digital audio, I hauled my old Teac 3340s (still have it) on vacation to Maine. I made a nice recording of the waves hitting the rocks. Sadly, I no longer have the tape. I only have the reel to reel for sentimental purposes. If anyone wanted to buy one, I would consider selling at a resonable price.
Marvel
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If you want real eq (har, har!) go to the manley labs site and check out their Pultec EQ. The originals are really sought after. Costs dollars though ($2k +). THey have bypass swithces. They aren't pretty, but they sound (or don't have a sound) wonderful.
http://www.manleylabs.com/containerpages/eqp1a99.html
Too bad they are so ugly. They are meant for studio racks.
Marvel
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Oops! Here's the house.
Marvel
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When you use the switch on the amp to reverse the speakers, you are most likely changing it at the preamp level. The speaker is still being driven by the same output amp. If you don.t move the wires on the amp, you won't know.
Trust me, I've got an old JVC that has all the same features, plus it came with the schematic for it. It has come in very handy over the last 30 years.
Marvel
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Again, thanks for the info. We get DSL sometime in the next week or so, which means I can have some drawings done, and put them up on a personal web site without waiting quite so long for the uploads. Right now it is like waiting for Godot.
Plus, I haven't used True Space in close to a year, so I'll have to learn it all over.
Marvel
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Dale,
Glad to see you are getting somewhere with the house.
Marvel
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djk,
Without the horn inside the cabinet, how deep should the base be? Could it just be made the same height as the top of the LS? That would give a bit more volume than you spec'd out. I could then adjust my drawing to suit. I think I made it the same height as the top, just for the fun of doing it.
Marvel
btw, I meant to say I had a folder labeled djk_wisdom. Sooner or later it comes in handy.
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I've heard of snow jobs, but this is ridiculous!
Reminds me of Waterloo, but we didn't have giraffes.
Marvel
This would be a cool poster!
in General Klipsch Info
Posted