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Multi-Way Conventional loudspeakers with crossovers

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Old 8th May 2011, 05:07 AM   #391
49 - for the 18th time
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Originally Posted by Pano View Post
Ha! First thing I noticed was the stack of Priority Mail boxes. What was I thinking??
Blinded by the lovely cork baffle???? Vrrrreeeeyyyyy nice!
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Old 8th May 2011, 06:01 AM   #392
vaughn is offline vaughn  United States
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Hmmm, I'm going to have to stage my photos more carefully in the future, or result to an image editing software
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Old 8th May 2011, 07:03 AM   #393
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Old 8th May 2011, 07:09 PM   #394
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John likes Bass
Who Doesn't ? Without Bass, music has no get up and get your groove on. Gives it the Beat. That my feet so desprately need ! Like Kicking out the Kick drum.
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Last edited by Altec Best; 8th May 2011 at 07:11 PM.
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Old 15th May 2011, 05:02 AM   #395
schro20 is offline schro20  United States
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Default First measurements: trying to sort things out

So I finally got around to hooking up all my measurement stuff and took the first measurements of my Manzanitas (original design) tonight. Below is the screen grab from ARTA. Basically I took several measurements varying the distance to the back wall (from 1-2.5m) and the distance of the measurement microphone from 0.5-1.5m. The overall shape of the response is pretty much the same. I took the measurements in a room which is fairly "bright." Overall dimension along the measurement direction is 8m. The overall trend of everything from 1-2kHz on up being relatively lower than the frequency response below that matches what I am hearing. I was comparing the Manzanitas the other day with my Plutos and there definitely is less volume in the higher frequencies on the Manzanitas. So it looks like I need to think about less attenuation in the high frequency path. On that note, what is the cross over frequency for the Manzanitas? Does it coincide with the drop that I am seeing from 1-2kHz on up? I wonder whether others have seen this too or whether that is particular to my listening environment. As that case may be, one question is what I should do to the cross over to lift the higher end.

My overall goal in these measurements (and the ones to follow) is to see how things will turn out if I go active. Has anyone tried this? I have a DCX2496 that I want to use for this purpose. Any stories to share on that kind of setup?

Thanks much!

Peter
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File Type: jpg Manzanita.jpg (213.4 KB, 846 views)
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Old 15th May 2011, 05:19 AM   #396
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Take a look here --> Fast, fun, Inexpensive OB project
The reason, the 27TDFC sensitivity is 88dB instead 90dB
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Old 15th May 2011, 05:22 AM   #397
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Well, I heard the original updated Manzanita's and the HE model over the last two days. I had to leave before John had the Gigantus ones up. All I can say is WOW!!!! John always has some of the best stuff I've ever heard and these were no exception. The HE's were smooth and refined, with none of the shout you would expect from the Seas driver. He's tamed it well and that setup sounds damn good. And he was limited to his SS amp as his ASL tube amp shot craps. He said they sound absolutely spectacular with the SEP amp. I'd be interested in hearing them when he finds a suitable replacement for the woofer.

On the other hand, the updated originals sounds very nice as well. Incedible bass extension for such a small baffle and being off the floor two feet. I've got to build me some of these as they would work perfect in my smaller listening room and they'd fit into my limited budget very well! John told me what drivers he was using but as usual my steel sieve of a brain let it all slide through. Since he was selling these I didn't feel it appropriate to ask about the crossover components.

Here's a link to the pics I took at the LSAF show. There is a pic of both of these speakers there.

LSAF 2011 Pics
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Old 15th May 2011, 03:57 PM   #398
Pano is offline Pano  United States
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Thanks for that Shane.

I got an email from John tht said he was up until 2AM playing music for visitors. He said much of the day was SRO with the new Manzanitas being very popular and the HE version a great sucess.

Sorry to hear about the tube amp. He bought it just for the show!

Since I could not be in three places at once (in London & Cambridge at the moment), I just get to read about it. Glad that John has finally decided to go commerical with these, his designs are great and extremely good value for money.

I'll post more when more info comes in.
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Old 15th May 2011, 04:56 PM   #399
vaughn is offline vaughn  United States
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I'm about to start a rebuild on a Pilot SA-232 amp, which I bought specifically to power the HE version of these when the design comes out. Right now I'm going back and forth between an old PP 6BQ5 Fisher console amp and Yamaha CR-820 on the original Manzanitas. They both sound great!

At the very top end of the range of my normal listening levels I can start to get some "sonic funkiness" from the 12" driver, but most of the time it does much better than I would ever expect it to through the midrange.

I'm glad that John is going commercial with these, he deserves to make some money from all of his hard work. I just hope the designs are still made available here
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Old 17th May 2011, 11:00 AM   #400
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I have a Tubelab simple se that was waiting for a high efficiency speaker system. Just need to order the transformers and sundries. That HE design looks perfect for it. Will John be selling plans like Bob Brines does?

Fooling around with the on line calculators one can see how small changes in driver impedance at the cross over frequency can really effect component values. Doing it by the seat of the pants would most likely mean multiple parts orders that could quickly run into a couple hundred bucks and lots of left over parts. A reasonable priced set of plans would be a bargain in light of this.
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