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Old 9th April 2010, 12:02 PM   #31
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You mean where would you wish to roll your sub off? At whichever frequency works best for you in practice.
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Old 9th April 2010, 12:07 PM   #32
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I will let the sub go as far down as it can, but when should i cut off the speakers? 50hz? 60hz? 70hz? 80hz?
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Old 9th April 2010, 01:29 PM   #33
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That's what I was refering to. See above: whatever works best for you in practice.
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Old 9th April 2010, 01:31 PM   #34
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Yes, but how do i make a XO for the speakers?
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Old 9th April 2010, 01:50 PM   #35
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A passive XO, that low and for a fullrange...donŽt. YouŽd need measuring equipment and very expensive parts. Stop thinking megadollar, start building. My bet is youŽll find out you donŽt need the sub at all.
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Old 9th April 2010, 01:57 PM   #36
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Perhaps a passive line-level crossover (PLLXO) would be something to try later?

Passive Line-Level Crossover
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Old 9th April 2010, 02:15 PM   #37
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Good idea, but you need separate preamp and power amp. Inserting one into a do-it-all amp can be a bit of work.
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Old 9th April 2010, 02:28 PM   #38
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Just a bit.

Pit's advice is good. Just get on with it. Chances are you won't need to cut the Lotus boxes, esp. with twin units, just let them do their thing & use the sub to improve the dynamic range of the bottom end if necessay. Same would apply to the Microtowers etc.
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Old 9th April 2010, 02:29 PM   #39
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True - it costs gain.

Rullknufs, you could use digital EQ to experiment with the bass cutoff. If you have a multichannel soundcard, that's perfect, but if you only have stereo out, you can assign one channel to the sub and then drive the fullranges with the other mono channel. And then you can EQ each channel separately until they fit well.
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Old 9th April 2010, 02:39 PM   #40
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Scott - just one unfair question. WerenŽt your first DIY projects (boxes, motorbikes, whatever) planned to be the absolute worldbeaters?
Depth of pocket and feet on the ground have to find a common level - and with a Beatles song covered by Joe Cocker in mind, it can be done.
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