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Old 8th December 2010, 11:09 AM   #1
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Default Next step for DSP based OB

Parts List....

Arcam Alpha 9 - 12" Sealed Sub
Cambridge Audio 640a - Mid(850439)+HF(xt25tg03) - Passive XO (2k)
1 x MiniDSP - Sending LF to SUB

You can imagine whats next!! Funds have finally come around and its time to get another mini and an amp for the HF, then some sort of preamp for control.

I've looked at quite a few options but for anybody who knows me I really have no idea what I'm doing

My current thinking is a T-amp for the HF and a B1 for the Pre but I really am open to suggestions.

All post welcome
Cheers
Dean
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File Type: jpg NB - Side On.jpg (180.5 KB, 264 views)
File Type: jpg NB - Front on.jpg (169.5 KB, 260 views)
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Old 8th December 2010, 11:24 AM   #2
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Forgot to mention, its sounds great as is but i am using 10db of passive BSC.
It is still shy in mid bass at the 400hz XO point.

Dean
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Old 8th December 2010, 12:32 PM   #3
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Good work! What do you use for suspending the drivers?
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Old 8th December 2010, 01:48 PM   #4
Pano is offline Pano  United States
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10dB is a lot, but not uncommon in OB. It means gobs more power is needed. Does not matter if passive or active, you still need the headroom. So size your amp accordingly. You are now down to effectively 77dB/W worst case. Actually better than that with 2 drivers and he front-rear firing thing.

Very interested to learn how you like the miniDSP in this application
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Old 8th December 2010, 02:35 PM   #5
cuibono is offline cuibono  United States
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I like your wood working, nice job. Did you sew the black covers?

I just started using miniDSP (two of them). I like them so far, although I still haven't finalized it. I use +15dB of EQ on the mid and woofer, and I think that is causing the miniDSP output to clip, although on its own internal meters dont indicate that.

You might not need a preamp - the miniDSP has a single pot that can control many miniDSP kits. The only thing I need is to find a programmable motorized pot, so I can use my remote with it.

Keep us posted!
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Old 8th December 2010, 06:10 PM   #6
SAC is offline SAC  United Kingdom
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41Hz amp9b (assembled board) is an excellent option for you if you do not mind building your amp. I have recommended it recently in this forum;

Amps for OB's
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Old 8th December 2010, 11:45 PM   #7
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Some great suggestions guys, thankyou.

The rubber suspenders are from Bunnings (AUS) and are really ladder/gutter holder thingies. They come with a hook through an eyelet at each end which can be removed then simply put a screw/bolt through and your done. They seem to work well in the isolation roll as i cant feel any vibration at the far end when playing music. They also come in different lengths and have an American patent number on them.

I did sew a piece of material in a tapered tube shape to cover the stands, my better half loves the look and i tend to agree, although there is some tweeter attenuation which i hope to measure one day.

The match between drivers/equalization/amp headroom is going to be interesting. Seeing what happens with so much eq at the minidsp output will be to. Could i raise the low end and drop the top to balance excess at the outputs of the mini??

The great thing about this project is the 1 day it took me to get it built and running, and no sanding/painting !!!!!!!!!!!YAY!!!!!!!!!!!!

I was thinking a seperate preamp module so i can switch my inputs.
Any suggestions?

Dean
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Old 8th December 2010, 11:53 PM   #8
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If anybody wants me to get some more details on the rubber bands just let me know.

Dean
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Old 9th December 2010, 02:02 AM   #9
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Any suggestions on the preamp front???

Would the B1 be an option?

Dean
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Old 9th December 2010, 07:10 AM   #10
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Has anybody used a similar setup who want's to add there 2 cents ???

Dean
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