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Mar-Kel70 in Sweden
Mar-Kel70 in Sweden
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Old 9th April 2010, 12:02 PM   #31
Scottmoose is offline Scottmoose  United Kingdom
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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
Rullknufs is offline Rullknufs  Sweden
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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
Scottmoose is offline Scottmoose  United Kingdom
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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
Rullknufs is offline Rullknufs  Sweden
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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
Pit Hinder is offline Pit Hinder  Germany
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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
kristleifur is offline kristleifur  Iceland
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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
Pit Hinder is offline Pit Hinder  Germany
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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
Scottmoose is offline Scottmoose  United Kingdom
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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
kristleifur is offline kristleifur  Iceland
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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
Pit Hinder is offline Pit Hinder  Germany
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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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