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Multi-Way Conventional loudspeakers with crossovers

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Old 4th February 2013, 06:58 AM   #2251
navin is offline navin  India
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Quote:
Originally Posted by Mixon1 View Post
I.m not sure what you meen with "lobing"?
Quote:
Originally Posted by Mixon1 View Post
But instead of the lower tweeter place a mid. like D54 and two 7" as woofer like Navin suggested!?
Exactly. Many years ago I built a WW TT WW center speaker using 4 Vifa TC 12cm series woofers and a pair of their tweeters. The reason I had for using 2 tweeters was power handling (the TC series was a very basic series).

The 2 tweeters were in a vertical array (I chamfered the faceplates so that the c-c distance of the 2 domes were as close together as possible). Despite this I had noticeable audible lobing (a phasy effect) that started at around 5-6khz.

I have been wary about lobing since. In the 80s Gross and Polk worked on reducing lobing while improving power handling by using multiple tweeters. They would roll off the tweeters at different frequencies. If i remember right their most extreme design (the Polk SDA-SRS) had 4 tweeters but while all 4 tweeters operated at 1.5khz by 14khz on,ly one tweeter was operating. They called this "Progressive Point Source".
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Old 22nd February 2013, 03:14 PM   #2252
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Hi everyone,

I a m not very familliar with this forum but I have heard lots of good things about it, so here is my contribution to show my last project.

It has been built around informations taken from 3 Vejs SB Acoustics

I have put my twist on the cabinet, reworking the volumes and the baffle, a friend helped me upgrade the crosover a bit and lately I replaced the tweeter to a better one.

As you can see, the original Design has on each sides:
1x SB-Acoustics SB29RDC-C000-4
1 x SB12MNRX25-4
2 x SB17NRXC35-8

So this is what I ended up with...
Click the image to open in full size.

As said earlier, lately I replace the tweeter with the Satori TW29R to reach an even better sound then the original version without even touching the Xover...here is the new look..

Click the image to open in full size.

These are the best sounding speakers I have ever heard ( and own).

Hope you like it, and I can tell you it is well worth the cost....



Pierre

Last edited by pierre666; 22nd February 2013 at 03:20 PM.
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Old 25th February 2013, 08:25 AM   #2253
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inConcert Miles, a design from StigErik (tangenavdesign). At the moment having a guest appearance in my living room. Normally they reside in my HT, with a "miniMiles" (Beyma FR15A/2) center and four JBL 8340, but I am expanding my HT and needed a place to store them.

Click the image to open in full size.
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Old 25th February 2013, 04:11 PM   #2254
Rob41 is offline Rob41  United States
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Although there are no DIY components, my miniDSP and UMIK-1 mic should arrive shortly. In a few weeks I have to ship out but I'll be back home in the middle of July when I plan to build my first set of speakers.

My system consists of a SAE 2600, SAE 2400, Soundcraftsmen MA5002, Heathkit AA-1800, Heathkit AA-1600, a couple Carver mono-blocks, Heathkit AP-18-Preamp and a Pioneer RT-707 Reel to Reel.

Click the image to open in full size.
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Old 27th February 2013, 08:23 PM   #2255
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MSW in an exotic figure:
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Old 27th February 2013, 08:35 PM   #2256
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Rob41, your speakers look suspiciously like these:
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Old 27th February 2013, 08:40 PM   #2257
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renne, you build those?
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Old 27th February 2013, 08:57 PM   #2258
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Quote:
Originally Posted by Cal Weldon View Post
renne, you build those?
No a friend job. very unique speaker indeed
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Old 27th February 2013, 09:22 PM   #2259
Rob41 is offline Rob41  United States
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Quote:
Originally Posted by Cal Weldon View Post
Rob41, your speakers look suspiciously like these:
Yup, they are indeed MV-15. Very similar. Mine are PD3's and those MV-15's look like a cross between PD3's and PD18's.

Here is a pic of mine:

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Old 4th March 2013, 07:30 PM   #2260
pegodk is offline pegodk  Denmark
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Default My version of the Peerless Nomex 164 (Troels Gravesen)

Here's some pictures of my version of Troels Gravesens Nomex 164, featuring the Nomex HDS exclusive bass driver (830883) and a curved cabinet.

The 830883 unit is very similar to the 830875, but small changes might have to be implemented. Right now I have just adjusted the tweeter by changing the L-pad values to 1.2 Ohm and 15 Ohm, but I might try 1Ohm/18 Ohms as well. I have done a measurement as well and the response is very linear (but with a small dip at the crossover frequency, around 3½kHz). I hope I can fix this by adjusting the Zobel network to the 830883s slightly lower voice coil inductance. (Change C2021 to 3.3uF if you follow the link to Troels' design).

PEERLESS-NOMEX-164
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