SR-71's Seas ER18RNX 7" woofer sold out at Madisound :( Other 2-way suggestions? - Page 3 - diyAudio
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Old 3rd January 2008, 10:53 PM   #21
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Thanks for the link! Actually I read your pages a few days ago, very helpful.

I might want to place the speakers near a wall? I also like the sound of a front ported speaker. I have a pair of JM Labs / Focal chorus 807 bookshelf's that also use 7" woofers. These are front ported and I like the extra sound the port puts forward.

I'm not ready to tackle making up my own crossovers yet. Thats why I'm concerned about changing the design to much. I'm gonna have to stick with the pre assembled crossovers from Madisound for now. Unless your ok with my sending them your plans to build?

Basically I just want those seas components in a front ported (3-4") large bookshelf.
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Old 4th January 2008, 12:25 AM   #22
Jay_WJ is offline Jay_WJ  United States
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Crossover building (not designing) is much easier than cabinet building

Anyway, I see what you want to do. Then why place the port above tweeter? It will change the tweeter's diffraction pattern.

If I were you, I'd shorten the cabinet width to 8". A little narrower baffle won't have any noticeable effect. According to my calculation, 8"x18"x12" (WxHxD) will give a box net volume of 18 liters. Anything between 14 and 20 liters can be used to obtain a smooth bass curve for the ER18 without much affecting power handling.

2" diameter port is sufficient for a single 7" woofer. People use a 2" tube even for 7" MTM.
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Old 4th January 2008, 12:52 AM   #23
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"Then why place the port above tweeter? It will change the tweeter's diffraction pattern."

This is what I was wondering about. Can you explain diffraction pattern to me please.

So if I go wit the 2" tube should I place it under the woofer?
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Old 4th January 2008, 01:04 AM   #24
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I just ordered a pair of these woofers, and Madisound said that they will be 4-6 weeks backordered.


Sheldon
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Old 4th January 2008, 02:22 AM   #25
Jay_WJ is offline Jay_WJ  United States
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Quote:
Originally posted by nordhaven
"Then why place the port above tweeter? It will change the tweeter's diffraction pattern."

This is what I was wondering about. Can you explain diffraction pattern to me please.

So if I go wit the 2" tube should I place it under the woofer?
Here's a good write-up about the baffle diffraction effects on tweeter response:

http://www.rjbaudio.com/Audiofiles/t...ffraction.html

Diameter of a tube shouldn't be related to its location. If you use a 2" dia tube, you don't have to use an angled one.
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Old 8th January 2008, 03:44 PM   #26
Keltern is offline Keltern  Norway
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Has anyone buildt these ZA-SR71 speakers? And perhaps have something to say on the performance?

I'm considering building them, so I'm looking for some feedback on how they behave..
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Old 17th January 2008, 09:19 PM   #27
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OK.. I received the SR-71 kit from Madisound. On first glance, I was surprised that the pre-assembled crossovers do not come with male spade disconnects. Instead, you have to solder wire to them. They did not come with a schematic, so I'll have to get that from zaph's site. The bad thing about them not supplying this is that newbies would have to rely on a 3rd party website to retrieve the schematic, even though they link to zaph.. since it is a kit, it should be included. I'm not a newb to using crossovers, but I still need to check zaph's site to double-check. I figure the reason they don't provide this is because they'd then feel obligated to provide more information like enclosure size recommendation and baffle dimensions. Shouldn't be hard to print out though. I'm thinking not printing physical paper products these days is to save money which is totally cool too. What a coincidence! Our power and internet went out today, and I couldn't get online and get that information when I was bored and wanted to work on the wiring.

Everything was packaged pretty well.. I'd have wrapped some of the parts in the slim box (which has terminal cups, xovers, wire, etc) with some foam to keep them from rubbing together though.

About a week after my order, my father says that it is on backorder again. That's odd... it was recently back in stock and then now out again? Must be popular! I'm thinking it is a great deal actually, because I paid $300 for the parts to build a variation of that AR.com kit (PEERLESS 850122 CSX with Usher 9950) which the parts list for that is below:

Part Number Description Qty. Ordered Qty. Shipped Price Ext. Price
016-3.3 3.3 OHM 10W RESISTOR .. 2 2 $0.39 $0.78
016-8.2 8.2 OHM 10W RESISTOR .. 2 2 $0.39 $0.78
027-414 DAYTON DMPC-2.0 2.0uF-250V POLYPROPYLEN .. 2 2 $1.52 $3.04
027-424 DAYTON DMPC-6.8 6.8uF-250V POLYPROPYLEN .. 2 2 $2.25 $4.50
027-426 DAYTON DMPC-8.2 8.2uF-250V POLYPROPYLEN .. 2 2 $2.75 $5.50
027-436 DAYTON DMPC-20 20uF-250V POLYPROPYLENE .. 2 2 $4.95 $9.90
027-440 DAYTON DMPC-30 30uF-250V POLYPROPYLENE .. 2 2 $7.88 $15.76
081-422 #8 x 3/4" DEEP THREAD PAN HEAD BLACK 10 .. 1 1 $2.25 $2.25
240-725 SPEAKER CABINET TOE SPIKES 4 PC SET 3/8 .. 2 2 $2.50 $5.00
260-311 GOLD HIGH POWER TERMINAL ROUND .. 2 2 $3.40 $6.80
297-632 PEERLESS 850122 CSX 6-1/2" WOOFER .. 2 2 $43.23 $86.46
255-218 JANTZEN .30mH 18 GA AIR CORE INDUCTOR .. 2 2 $2.71 $5.42
255-254 JANTZEN 1.20mH 18 GA AIR CORE INDUCTOR .. 2 2 $4.82 $9.64
255-426 JANTZEN 1.50mH 15 GA AIR CORE INDUCTOR .. 2 2 $9.86 $19.72
276-608 USHER 9950-20 1" TEXTILE DOME TWEETER .. 2 2 $59.79 $119.58


I absolutely love the quality of the kit I put together with the above components and I'm expecting the SR-71 to be even better. My dad is going to meet up at my place with his two pairs and we'll split it to make the center channels for each of our setups! I may skimp on the baffle dimensions on the center to make it more slim but I'll be ok with the slight change in intended sound (my room problems are more to worry about). Although I don't like the fact I'll have an asymmetrical speaker (instead of MTM), I'll probably cover it with a grill cloth to not bring attention to it. That's one reason I liked using a particular Vifa coaxial.. it sounded really great for center channel and was "centered" aesthetically.

I'll post our 3 pairs' progress here as the project commences. My main pair will be parallelegram shaped so that it cradles the DLP's angles. My current mains have this design and it makes the whole speaker setup look much smaller and better!
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Old 17th January 2008, 11:47 PM   #28
peter_m is offline peter_m  Canada
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Dude... you have to tell us how the SR-71 sounds!!!!
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Old 17th January 2008, 11:56 PM   #29
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I'll know in a couple weeks when they're built. Eventually I'm getting the SR-71's for surround too.
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Old 18th January 2008, 03:23 AM   #30
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Has anyone built the SR-71 yet? What the heck, who's buying all these things? I have searched and searched but have not found one detailed review.
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