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Old 10th January 2013, 03:51 PM   #11
more10 is offline more10  Sweden
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With a tapped horn that large, you're going to need some sort or time alignment method.
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My living room is huge.
Huge enough to place side tapped horn 5 meters closer to listening position than side systems?
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Old 10th January 2013, 06:02 PM   #12
OscarS is offline OscarS  United States
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Originally Posted by iamthefly View Post
1)How do I learn the basics? I'm really struggling with actually understanding the jargon even after I look up what it means. Book?
The Loudspeaker Design Cookbook, by Vance Dickason. Being a physics teacher (hopefully with an actual physics degree), you should have no problem understanding the "jargon".
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Old 10th January 2013, 07:16 PM   #13
GM is offline GM  United States
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Thanks folks,

I can stretch to the Infinity 1260. I did fancy a stab at a transmission line though, just for fun as the stuff I'd read said they were good. comments?.
You're welcome!

If its published specs are reasonably accurate, the 1260 does 20 Hz 'easy' in a vented TL [MLTL], my box loading choice for most vented alignments.

GM
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Old 10th January 2013, 08:43 PM   #14
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I can't decide WRT the JBL vs Infinity.

The JBL has a nice cast frame, and is the same price. Does that indicate some compromise made elsewhere?

Anyone tried both?
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Old 10th January 2013, 09:47 PM   #15
GM is offline GM  United States
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Yeah, on paper it has less effective motor strength, more inductance, so even with a bit more Xmax I would still choose the Infinity even if it cost a bit more. Cab loading wise, both sim audibly the same in a 20 Hz tuned reflex except the JBL needs a larger/longer vent, so to my way of thinking, another reason to choose the Infinity.

The 'burning' question then, is there a better 'bang/buck' to it?

GM
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Old 11th January 2013, 03:49 PM   #16
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Originally Posted by OscarS View Post
The Loudspeaker Design Cookbook, by Vance Dickason. Being a physics teacher (hopefully with an actual physics degree), you should have no problem understanding the "jargon".
Will check out the book, thanks. Actually not a physics degree, an electrical engineering degree, but I'll get on top of the jargon.
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Old 11th January 2013, 03:58 PM   #17
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thanks again folks,

I was talking to the wood work teacher today who is pressing me into using Russian birch-wood ply. He can really smooth the edges down to give a nice zebra effect and stain it nicely. However he says 15mm but I get the impression that that would be too thin?

I'll probably go for the infinity then, but I'd just like to pass this by you as its cheaper, and says 20Hz+ where as the Infinity 1260w says 23Hz+:

The TS-W309D4 is recommended for enclosed use and is also available as a single voice coil model or as a a dual coil model for both enclosed and free-air use.
Pioneer TS-W309D4 Features:

  • Maximum input power 1.400 W
  • Nominal input power 400 W
  • Impedance 2ohms / 8ohms
  • Frequency response 20 - 220 Hz
  • Lowest resonance frequency 37 Hz
  • Sensitivity (1W/1m) 94 dB
  • Woofer size 30 cm
  • Woofer material IMPP Composite Seamless Cone
  • Voice Coil type Dual
  • Dual 4ohms voice coils: 2 or 8ohms Yes
  • Voice Coil bobbin type Aluminum, diam.2 inch (48mm)
  • Pole Yoke Type Extended and Vented pole yoke
  • Magnets Double-stacked, high power
  • Terminals: Push-type
  • Recommended sealed enclosure 24,1 - 49,5 litres
  • Cut-out Hole: 283 mm mm
  • Mounting Depth: 153,1 mm mm
  • Surround Dual Layer, Fiber Reinforced Elastic Polymer Surround


Infinity 1260W:
  • 12" 4-ohm subwoofer
  • polypropylene woofer cone with large-roll rubber surround
  • progressive spider design for excellent cone control
  • frequency response: 23-400 Hz
  • power range: 100-300 watts RMS (1,200 watts peak power)
  • sensitivity: 93 dB
  • top-mount depth: 6-3/8"
  • sealed box volume: 1.25 cu. ft.
  • ported box volume: 2.0 cu. ft.
  • is prettier than the Pioneer
Whatcha think?

Last edited by iamthefly; 11th January 2013 at 04:18 PM.
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Old 11th January 2013, 05:02 PM   #18
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15mm birch should be stiffer than 18mm MDF.
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Old 11th January 2013, 05:30 PM   #19
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That ply ought to be okay if it's properly braced, to avoid the cabinet walls flexing.

GM, thanks for the comparison. I am curious, though - why would the JBL need the bigger vent?
Surely the extra 1mm of Xmax isn't enough.

If they'll both hit 20Hz, I'd take the JBL for the cast frame - not much risk of bending it while tightening screws.
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Old 11th January 2013, 07:42 PM   #20
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Thanks about the ply. its only about 60 a sheet after tax. they also do an oak veneered ply which is cheaper that i might use. Cross bracing, gotcha.

I'm confused, I've checked the infinity in 3 different sources and its usable frequency only goes down to 23Hz, is it that is just close enough or is there something I'm missing? While we're on the subject can a human being destinguish between 20Hz and 23Hz?

Cheers
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