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Old 9th December 2011, 01:01 PM   #1
diyAudio Member
Join Date: Oct 2002
Location: France
Default 7 active line arrays for HT

Hi again,

Many years ago I purchased a whole bunch of NSB drivers from Partsexpress and also the ApexJR 50cent tweeters. I'm now finally getting my HT ready and I need to start building my line arrays for the HT.

As you can see from my driver choices I'm not looking for perfection but I now like to do the best with what I've got. Before I start discussing my thoughts about my speaker design, I need some of your advice regarding my setup.

Reading many threads here, people recommend active setup in order to properly dial in the crossover and be able to fully tweak the sound. Passive crossover design is not something that I have knowledge to do.

I have speakers enough to do 16-20 nsb high line for each channel. I would probably need to do a sealed or ported design and I hope that they will go low enough so that I don't have to include another woofer in the design.

So the minimum amount of amplification would be 14 channels and as well the active crossover. That all adds up to a lot of money even if I do it DIY.

Any suggestions to how I should proceed? My current thoughts are.

1. Active amplification using class D. I was thinking using ljm_ljm L15D or L20D modules for about 200-300W per channel for 27E per channel. Adding suitable power supply I assume I will be at around 50-60 total per channel (not including case).
2. Mini-dsp. 2 in 4 out. I would need 4 boards at 99E, or around 50E per speaker for the crossover.

The way I think my setup would be is as follows.

1. All my sources will be plugged into a pre-amp or receiver with pre-out. This will have a remote control.
2. I assume each channel from the 7.1 pre-out will goto the mini-dsp. The mini-dsp will run the crossover-plugin and I will then get the signal out for the NSB and Tweeter crossover.
3. Each out from the mini-dsp will goto the amplifier and then to the speaker.

I have a few questions regarding my setup.

Each amplifier board has a volume control. I'm not sure how I should handle the volume with this setup. Would I set all of them at a pre-configured level and then handle the volume adjustments via the pre-amp remote?

I hope you guys can help me in this very ambitious project of mine. Would you do it differently?

Thanks for any input.

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Old 10th December 2011, 10:29 PM   #2
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Join Date: Jan 2004
Location: Silicon Valley, California
Why not just build a pair to start with, so you can test your concept before spending so much money and effort?

Exactly which drivers are you using? Can the mids be used in open baffle (ie, do they have a very high Qts)?
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