46262
From: Ian Richards, [cpe-138-130-155-205.nsw.bigpond.net.au]
Subject: Combining a subwoofer with a planar speaker
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I have a set of Apogee Stage speakers that I love and would like to add a subwoofer to them. I'd like some advice on the best approach. Apogee is now out of business but they used to make a system called the "Mini Grand" that consisted of a set of Stages sitting on subwoofers. Each subwoofer had two drivers and the crossover was 24db/octave at 70hz via an electronic crossover (of rather poor sound quality) That's basically the approach I'd like to emulate. That means I know the rough volume and dimensions of the enclosure (25" x 12" x16") and crossover point (70Hz). What I'd like some advice on is the type of enclosure and the choice of drivers. My main requirement is for the subwoofer to mate well with the planars. This would suggest speed and lower mid range quality would be more important than low frequency extension. The cost of the drivers is not an issue (within reason.) The crossover will take the form of an RC network before the subwoofer amp. I could use any slope up to 24db/octave with a Linkwitz Riley constant voltage alignment. Any suggestions on suitable drivers and enclosure design would be most welcome. Ian Moderated By: brian@diysubwoofers.org |
46264
From: djk, [oproxy.rockwellcollins.com]
Subject: Linkwitz
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Build the push-pull dipole sub from Linkwitz. http://www.linkwitzlab.com/woofer.htm |
46265
From: Ian Richards, [cpe-58-168-91-3.nsw.bigpond.net.au]
Subject: Re: Linkwitz
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Thanks for the Linkwitz link. I can see where you are coming from with the dipole suggestion but the use of 12" drivers is not going to be practical for me due to domestic constraints. I guess it may be possible to use 10" or 8" drivers in a dipole design but I suspect these could not move enough air. There is also a question whether drivers are available in this size with suitable parameters. If dipoles are not possibel what would be your second choice for the subwoofer design. Ian Moderated By: brian@diysubwoofers.org |
46271
From: andrewt, [host81-156-58-77.range81-156.btcentralplus.com]
Subject: Re: Linkwitz
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you could try a tapped horn. Look at DIYaudio.com for design details. |
46274
From: Ian Richards, [cpe-124-185-246-31.qld.bigpond.net.au]
Subject: Re: Linkwitz
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Actually I worked out that if I use 10" drivers I can just get away with a diplole design from a domestic viewpoint. 8" would be ideal but I fear that a pair won't be able to move the air. The Peerless 830452 10" XLS Subwoofer looks good but with a Qts of only 0.17 I would be worried that too much EQ would be needed to get decent LF extension. What do you think? If not suitable would you be able to suggest another driver. BTW I thank you for your comments. I can asure you it is appreciated. Ian Moderated By: brian@diysubwoofers.org |
Responses:
[46275]
46275
From: djk, [65-103-50-159.cdrr.qwest.net]
Subject: Re: Linkwitz
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I would look for a car stereo woofer with at least 10mm x-max, Fs=30hz (or less), and Qts not to exceed 0.7 Listen to the noise coming out of the rear vent(s)to see if it is acceptable. The push-pull reduces distortions from inexpensive woofers, giving you much more choice. My second choice would be a push-pull with a pair of 8s in a sealed box with a Linkwitz transform. This would have more output than the dual 12 Linkwitz di-pole, but not blend as well to planar/ribbon type mains. If size permitted I would run a line the height of the main speakers with the push-pull Linkwitz di-pole design. Using 8s would keep the width down. |
Responses:
None
46263
From: djk, [oproxy.rockwellcollins.com]
Subject: Linkwitz
| Build the push-pull dipole sub from Linkwitz. |
Responses:
None
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