mopardave
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Posts posted by mopardave
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19 minutes ago, Edgar said:
I usually adjust 1 dB at a time, ultimately I fine-tune to ½ dB, but only after a long time listening.
Ok, i will try that next time i get the backs off.
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1 minute ago, Crankysoldermeister said:
Modified Cornwall.
Ok, but they are home built vertical cornwalls, so are they still a cornwall? They are not Klipsch.
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1 hour ago, kevinmi said:
I was thinking for your current set-up. Just to see what they sounded like.
1 hour ago, kevinmi said:I was thinking for your current set-up. Just to see what they sounded like.
OK, ya know, i'm fairly happy with everything right now, except the bass is not perfect. When you add attenuation to the mid are you in return, turning the bass up or down as a result with the mid being turned down?
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8 minutes ago, Crankysoldermeister said:
Nothing anyone is using is a CornScala. “CornScala” is a misnomer.
Yeah i understand, but what do you call them?
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19 minutes ago, kevinmi said:
The Selenium D-405 isn't very deep, but the magnet is about 6 inches in diameter and weighs 20 lbs. I got a pair I'm not using...
The 510 horn looks to be very short. Think i could use any driver with it. So, really don't think im limited on space there.
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Just curious what the guys here are doing with attenuation, how much at a time, 1db, 2db or 3db?
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1 hour ago, RandyH001 said:
Dave , Which Woofer did you decide on ?
It's between the Crites 1526 stamped basket and the new K33E. I'm leaning towards the K33, because i don't want to introduce any boomyness. I listened to the Crites cast basket and to me sounded a bit boomy. I have not tried the stamped basket. Assuming the stamped basket will have the same effect.
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1 hour ago, ClaudeJ1 said:
Based and just words here, it appears you have yet to reduce your "top end" Horns' output low enough. It's ALL speaker designs are relative to the woofer output, which always needs the most power to operate. It's a question of Balance in a Real ROOM, which your DIY speakers have yet to achieve. So you should have another GO at that further high end reduction before you try other woofers. But hey, it's YOUR time and money, trying to please your Ears!
That's good advice. I will try adding some attenuation in this large room before i spring for the new woofers.
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6 minutes ago, wuzzzer said:
Just curious, what are you using it to measure?
I would like to take a full measure at my listening position first. Then i would like to take a measure of my mid horn driver combo.
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7 hours ago, wuzzzer said:
Yep, a laptop works best. Connect the UMIK via its USB cable to the laptop. Then go to the miniDSP website and look under the UMIK section because you'll need to enter the serial number of the UMIK to download two calibration files unique to that UMIK in order for it to work properly.
The regular file is for measuring speakers, the 90 degree file is for measuring subwoofers.
Happy to help if you need any more assistance!
Thank you . Will see if i can get this done later today.
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6 hours ago, ClaudeJ1 said:
You can split the off woofer section and BI-AMP with your existing passive networks. The link below is the best money I ever spent on an amplifier based on the TI chip with a gain potentiometer. It wins the best "bang for buck" of 2021. All you need is 2 Y connectors to split and feed the music signal to the bass and treble amps. You'll have to install some additional Red and Black connections in the rear, but this is why you are DIY, right?
This is a much better/easier solution than changing Autoformer settings and Capacitor values. For only 80 Bux and change for the Y connectors and Speaker Input connections, you improve everything.
My most REVEALING system is in the basement All horns with horn sub/plate amp, 106 db/2.83 Volts Sensitivity use this amp for months and it sounds great. It should be able to handle the Woofer duties with ease. Once you have upped the Woofer drive by 2-3 db SEPARATELY from the top end, you should be all set.
Thanks Claude. Really dont want to bi amp my system. A bit too involved for me. I would rather try a woofer swap. I was just listening to the system again at 75-80db levels and as the mid and highs were very clear and articulate, the low and mid base seemed there, but lacking at that volume. I think you are correct when you say the 3015LF would work nice at disco levels(100+). The base is very clean and controlled sounding. I like the mid base my old Heresy's have, that mid base punch in your gut. I like to feel my music as well as listen to it, but not at ear bleed levels.
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16 minutes ago, jjptkd said:
It appears as though REW wants to run its own signal generation from your computer to the stereo then measure that output through the Mic and back into the computer.
https://www.minidsp.com/applications/acoustic-measurements/umik-1-setup-with-rew
I see, ok i'll barrow my wifes laptop and see if i can figure this out. I will have to use my Marantz surround receiver to do this because the tube amp does not have a HDMI plug. Thanks for the info.
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I don't understand how to set this up. Why do i need audio out on my laptop? I thought i could just use my tube amp for that.
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27 minutes ago, ClaudeJ1 said:
This is why it's called DIY and the price you pay for not buying a Cornwall IV.
Of all the K33's I owned, my favorite version of the K33 was the -P version from the early 1960's, made by CTS of Paducah. It had a square magnet. I'm pretty sure this is the one that Bob Crites specified as his target woofer when he asked Eminence to custom make them for him. I'm sure Michael can verify this for the curious.
Those square magnet K33's had the best bass response in my Klipsch MWMs (which were designed for that woofer anyhow). The K43's I removed from said MWMs went into my LaScalas, where I discovered that Roy Delgado was right about the higher BL product "tilt" towards the higher frequencies of that woofer "mating up" better with the factory K400/K55/AA with new film capacitors.
This evolved into my discovery of the Kappa 15C as the "best bang for the buck" new replacement in a LaScala to yield BETTER midrange detail in the band of the LS bin. However, it did "thin out" the low end a bit, just like the K43 did, so I always recommended using a Subwoofer anyhow, so only improvements came out of the compromise.
After rereading the cornwall 2.0 thread i need to first double check that my 3015LF woofers are the 4ohm version. Next, I need to try pushing the cabinets back into the corners to see if bass gets better/lower. Also, looks like the 3015LF needs power to shine. I usually listen at 70db, so not alot of power pushed at that level. I'm in the beginning stages of installing some french doors in the opening to the basement at the bottom of the steps to isolate me/music from the wife. She doesn't appreciate anything over 80db level. Lastly, i will be ordering the Ayon spirit v tube amp which i think is 75w/ch, then i can really put the power to them. Also, looks like the Crites stamped basket woofers may be the best option without any other mods. Thanks guys.
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7 hours ago, RandyH001 said:
are these the Square Magnet K-33E ?
Actually, one was a square and one was bought new from Klipsch in 2002 and had a round mag.
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1 minute ago, mopardave said:
Thanks. Now i know why i have to turn the volume knob so much further compared to k33e in these cabinets.
Looks like i'm gonna have to buy 2 pair of woofers. One pair for my current cornscala and 2nd pair for the new build cornscala.
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3 hours ago, Edgar said:
3015LF in purple.
Thanks. Now i know why i have to turn the volume knob so much further compared to k33e in these cabinets.
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6 hours ago, Edgar said:
Bored this morning, so I modeled the Cornscala in WinISD with a bunch of different woofers. I estimated the volume at 175 liters and the tuning at 42.5 Hz.
K33E in magenta. CW1526 in red. CW1526C in orange. Eminence Kappa 15A is the best fit, in blue. Others, in green, are reasonable fits. Woofers listed but not shown did not respond well.
The graphic shows sensitivity as well as frequency response; all woofers driven with a 2.0 Volt signal.
Which one was the Kappalite 3015LF? I could easily add a resistor if i choose the 15A. Looks like the Crites stamped basket is next best. Thanks again for the graph.
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42 minutes ago, geoff. said:
Ok, I can relate to that.
I always found the K-33 boomy.
Even though it is now poo-pooed, I really liked the Kappa 15C in a Cornwall box. And as @jjptkd mentioned the K-48 is just a hands down killer.
Something else comes into play with the boominess, how close your speakers are to the back wall. I can’t listen to anything closer than 2 feet from the back wall because of the boomy bass. And the imaging thing.
When i tried the cast basket Crites they were close to the wall, maybe 1'. I now have the cabinets about 2' from the back wall.
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2 hours ago, geoff. said:
@mopardave, do you have/have you ever tried a pair of the Crites woofers in your “Cornwall inspired speakers”?
It was a long time coming waiting for a pair to appear on the used market up here (thanks @Islander) but they are a game changer in every speaker I put them in.
Simply put, if you think the K-33 goes low, the Crites woofer goes instantly and noticeably lower in the same application.
But there may be something else in this equation. Woofers love watts. That is another game changer in my limited experience.
As an aside and not to detract from this sentiment, I was privy to the cast frame woofers and had to hog out the motorboard of my “Cornwall inspired speakers” with a rasp to drop the woofer in the same hole a K-33 slotted right into. I remember my son coming down at midnight to see what all the noise was...
So as Claude mentioned, maybe for different reasons, the stamped frame may be a better idea for you.
Having a quick look at the specs for the Kappa 3015LF, it looks to me like it does not go as low as you are looking for? Built more for speed than comfort, lol.
Yes, I did try the Crites cast basket and I thought they were a bit boomy for me.
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2 hours ago, Edgar said:
Bored this morning, so I modeled the Cornscala in WinISD with a bunch of different woofers. I estimated the volume at 175 liters and the tuning at 42.5 Hz.
K33E in magenta. CW1526 in red. CW1526C in orange. Eminence Kappa 15A is the best fit, in blue. Others, in green, are reasonable fits. Woofers listed but not shown did not respond well.
The graphic shows sensitivity as well as frequency response; all woofers driven with a 2.0 Volt signal.
Ok, you will have to school me reading the graph. I assume spl is on the left, but what determines the best woofer here because I see some others peaking over the blue in spl?
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28 minutes ago, Edgar said:
Bored this morning, so I modeled the Cornscala in WinISD with a bunch of different woofers. I estimated the volume at 175 liters and the tuning at 42.5 Hz.
K33E in magenta. CW1526 in red. CW1526C in orange. Eminence Kappa 15A is the best fit, in blue. Others, in green, are reasonable fits. Woofers listed but not shown did not respond well.
The graphic shows sensitivity as well as frequency response; all woofers driven with a 2.0 Volt signal.
Thank you. Awesome
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14 minutes ago, jjptkd said:
Good morning! It seems @ClaudeJ1 is the expert here I'm sure you've seen the Super Cornwall thread the recommendation is the woofer you've been using but there is plenty of discussion in the 12 pages of different woofers. I myself use the k-48 Chorus woofer does not hit as low but very tight powerful bass in a smaller cabinet 4.5cuft vs the 6.5cuft of the Cornwall types.
Yes, cluad did say the 3015 had way more xmax, so should good pretty low. I will reread that thread later tonight and i will make note of your K48. Thanks and Merry Christmas.
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I have been using the Kappa 3015LF and i'm not too impressed with the low bass. They do sound nice, but not as low as the K33e i used in these cabinets as vert Cornwalls. Just curious to what others are using and liking for woofers in the Cornscala's. I have tried a Crites cast basket and i thought it was kind of boomy. I may use the K33E again, but would like your opinions. Thanks
Attenuation setting changes in 1db worth it?
in Technical/Restorations
Posted
That's what i thought, but wasn't sure. I think the human ear hears in 3db increments.