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Multi-Way Conventional loudspeakers with crossovers

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Old 3rd April 2013, 12:49 AM   #851
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Default Ultra essentials!!

Hello all...

I am providing the current build info in two parts...

First is a Bill of Materials....

Second will be a separately posted schematic diagram...

BOM & schematic can be matched up to complete the build....

OK.... BOM.....

L1 Woofer 1st order low pass electrical inductor. 18-22 MH Iron core. 15-16 ga. Default part at the moment is PE P/N 266-960 (16 ga. 20 MH)

L2 H.F. trap inductor 2.75 MH air core Perfect Lay Solen. 14 Ga. (Madisound) Range can vary from 2.4 - 2.90 MH Also available from PE.

C1 H.F. 1st order electrical high pass capacitor. 6.0 MFD. Possible PE P/N 027-236. 5.5 - 6.5 MFD to suit. Higher cost caps of equal MFD value are available from numerous sources. Look for 200 Volt or higher Poly, film and foil, MKP or Oil construction.

R1 HF trap bypass resistor... 15.0 ohm, 5-10 watt low noise MILS. Range can vary from 12-25 ohms.

R2 H.F Pad...8.0 ohm, 5-10 watt low noise MILS. Range can vary from 7-9 ohms.

Woofer. GRS-15PF-8 15" woofer. PE P/N 292-415.

Mid-tweeter. Vifa TC9FD18-08. PE 264-1062. Also available at Madisound.
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Old 3rd April 2013, 03:59 AM   #852
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Smile Thanks

John,

How nice your are. Appreciate & Thanks

Albert
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Old 3rd April 2013, 08:20 AM   #853
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Speaker looks very promising. I assume a 300B single ended and the Ultra is a bad combination?
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Old 3rd April 2013, 03:25 PM   #854
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Default Current MAS Altra Schematic

Please find the current MAS Ultra schematic. Enjoy!
Attached Images
File Type: png ultra-schema.png (34.8 KB, 918 views)
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Old 3rd April 2013, 03:45 PM   #855
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Default 300 B potential

The Ultra is approximately 84 dbw at one meter with the baffle face 36"- 48" from a sheet rocked rear wall. So, I recommend at least 10 watts RMS per channel at 8 ohms. I have driven it with a 5 WPC SE KT88 and for low to moderate listening that is fine. (90 db peaks from the pair at a typical listening position) But to get it to really sing, 20 - 50 WPC is what's needed. This speaker really loves tube amplification. Quality P/PT or SET.

John
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Old 3rd April 2013, 08:30 PM   #856
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Thanks.
I'm making a list of the parts. On your website, I see that there is also a MME Manzanita. Is the partlist and schematics of that one also available? And which one do you recommend for a first time builder who has a KT88 PP, but wants a 300B SE in the future.
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Old 3rd April 2013, 11:05 PM   #857
Pano is offline Pano  United States
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IMO, the Manazitas do need some power. 20 WPC is just enough, you need more to really rock out.
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Old 4th April 2013, 12:24 AM   #858
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Default Power Requirements for extended response passive OB's

This is a common and important topic... there is no single - simple answer that will settle this issue. Too many variables... the usual stuff... room size... Room dimensions, listening tastes, music types, low end bass extension preferences, it goes on for ever.

From a personal stand point... generally speaking, making a host of assumptions to be sure... a majority of listeners, a majority of the time, rarely exceed an average SPL of 85 db at the listening position. Given that, if you have a system that can provide clean peaks 10 db higher, you are in good shape.

So... a speaker that has a true operating efficiency in the mid 80's per watt, that does not roll off before reaching 30 Hz, you are working with a winner! 30watts of clean triode power will get you where you need to be.

If you want movie theater 100 db plus capabilities, that is a whole different situation. Especially if you need the bass extension to extend to subterranean extremes at lease breaking levels.
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Old 4th April 2013, 06:13 AM   #859
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Default Baffle layout

John,

Thanks for posting the BOM & Schematic. I thought I know the baffle size is 24"x48" with couple 6" wings, but still need its layout to start.

Albert
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Old 4th April 2013, 11:17 AM   #860
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5W and 84dB/W @ 1m will not satisfy many listeners.
25W and 84dB/W @ 1m will sound adequate for quite a few listeners on certain types of music source.
100W and 84dB/W @ 1m will sound good for many listeners for most types of music source.

I arrive at these conclusions by basing my experience on average listening levels and comparing those average listening levels to the very necessary overhead required for the peaks that far exceed the average levels.
case 1. 5W + 84dB = 91dB @ 1m
case 2. 25W +84dB = 98dB @ 1m
case 3. 100W + 84dB = 104dB @ 1m
From these peak levels subtract 10dB to 30dB for the peak to average overhead.
Subtract 8dB for listening at 2.4m
Add 3db for using two speakers at typical stereo separation distances

Apply -10dB & -8dB & +3 dB to case 1 and you end up with average listening levels that cannot exceed ~76dB
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