Please advise on how to set up an Open Baffle system - diyAudio
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Old 10th June 2015, 08:57 PM   #1
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Default Please advise on how to set up amps and XO for an Open Baffle system

Hi All,
Open baffles have caught my interest and I am making a plan to build a pair with double eminence Alpha 15a woofers and probably Tang band w8-1808 full range much in line with the Trio15 TB speakers from pure audio project.

My aim is to use my Simple SE tube amp http:////tubelab.com/designs/tubelab-sse/ for the full rangers and two hypex ds 4.0 plate amplifiers Hypex Electronics BV - DS4.0 for each double woofer. I already own one ds 4.0 so I would need to buy a second one or go another route using one pro amp like a Crown XLS 1000 Crown XLS 1000 Power Amplifier 2 x 350W at 4 Ohms for the woofers of both speakers.
The source is a Teac UD-501 DAC that has regular and balanced outputs.
I have been looking at lots of options but what I cannot figure out is what the best way would be to get this combination to work within a reasonable budget.

Some of the idea’s:
Split the output of the Tube amp. One to the W8-1808’s and one to the plate amp that has its own crossover. This is the way I run my current setup where I use one bass helper/subwoofer with the plate amp together with two horns that run full range. In order to cut the frequency of the W8-1808 I would need some sort of passive high pass filter right? Knowing very little filters or XO’s what kind of filter would be advisable?

Or:

Use a passive (or active?) pre amp and an active crossover (mini dsp?) that splits the signal into the tube amp and the pro amp (or double plate amps). Would a passive preamp work well together with a tube amp that already has volume control? What would be a suitable pre-amp, or maybe a combination of pre-amp with active crossover? Can pro amps with balanced in and outputs be combined with ‘regular’ plugs and speaker in and outputs?

Or:

Maybe another option altogether?

I have been surfing the web for weeks now but haven't been able to figure it out.
Any idea’s or insights are very welcome,

Best regards,
Jock

Last edited by Jockaruba; 11th June 2015 at 03:49 PM. Reason: Clarify the titel
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Old 10th June 2015, 09:12 PM   #2
sreten is offline sreten  United Kingdom
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Hi,

Start here : http://www.quarter-wave.com/OBs/OB_Design.pdf

rgds, sreten.
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Old 11th June 2015, 02:29 PM   #3
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Thanks Sreten,
This is the main page when it comes to OB I think so I had not missed that one.

To clarify my question I have added a sketch.
The question is what could be a good/or the best way to make the combination of amps and speakers to work in a OB. I could be in 2 way system where the bass has its separate amp I guess.

The question marks in the sketch mark where I don't know the best way to XO the frequencies or add volume control.
In combination with the plate amps I think it would be right before the full range driver.
In combination with the Crown amp it could be before the power amps as well but then I don't know how to regulate the volume of both amps together.

Best regards,
Jock
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Old 12th June 2015, 08:08 PM   #4
kec is offline kec  United States
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Hi Jock,

I use 2 Crown XLS1000 amps for my PAP style OB. Each amp powers an Eminence Beta 12LTA full range and 2 GRS 15PF woofers (parallel) using the internal crossover @ 150 Hz. Works great and I'm real happy with it.

Parts Express has the XLS1000 on sale for $230 which is a great deal. I got mine for $300 when they first came out.

Good luck,
Ken
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Old 12th June 2015, 11:32 PM   #5
adason is offline adason  United States
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Hi Jockaruba,

I had similar dilemma, this is what I did...signal from DAC/Preamp/signal selector/EQ goes to small tube amp, powering single fullrange or mid/tweet section, with just one cap on open baffle, the same signal is sniffed by active crossover (or plate amp) or subwoofer active circuit leading to big solid state amp powering woofers. Rather flexible.
You can find some useful and irrelevant info on my page.
Audio Pages: Simple active crossover and chip amplifiers
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Old 14th June 2015, 05:20 PM   #6
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Thanks Ken and Adason,

I think the setup where I use two plate amps for the woofers and one tube amp for the full rangers looks like the most feasible.

Adason, wat do you mean by "with just one cap on the open baffle"?

Thanks,
Jock
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Old 14th June 2015, 05:52 PM   #7
adason is offline adason  United States
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Jock, I feed full signal to tube amp, so I limit low frequencies to the open baffle just by one capacitor, that is enough.
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Old 14th June 2015, 06:59 PM   #8
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Quote:
Originally Posted by adason View Post
Jock, I feed full signal to tube amp, so I limit low frequencies to the open baffle just by one capacitor, that is enough.
Got it, I will go for the same setup then. This way I can control the volume with the tube amp and tap of the tube amps output as an input for the plate amps.

Could you suggest a capacitator as a starting point for the Tangband W8-1808 and/or give me some advise on where to start or what to look for? (not my expertise at all)

Best regards,
Jock
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Old 14th June 2015, 07:20 PM   #9
adason is offline adason  United States
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Sure, what is the crossover frequency you want?
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Old 14th June 2015, 07:27 PM   #10
adason is offline adason  United States
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I use ~150-160 Hz...some people might find that too high, but they do not realize I always use two subwoofers, and they are placed right under the open baffles, so technically, those are not subwoofers per se, rather just woofers of multi way setup.

In FAST, some go higher all the way up to 300Hz...it all matters on application.

If true single sub is used, crossover frequency recommended to eliminate localization issues is much lower.
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