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Old 3rd February 2008, 06:02 AM   #11
peter_m is offline peter_m  Canada
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review / criticism of the unit: http://www.hometheatershack.com/foru...fications.html

Here is what I chose to do instead: http://www.htguide.com/forum/showthread.php4?t=28300

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Old 3rd February 2008, 06:12 PM   #12
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I use a modded VMPS active filter (only low pass 24 dB/oct) since many years. I don´t now id they sell them as a separate item today but there is a few words at the bottom of this page:

http://www.vmpsaudio.com/loudspeakers.htm

Mine has an adjustable cut off (corner) frequence. I have change the quad op amps from TL 74 to LT 1058CN (four of them). I also made mods to the power supply e.g. better rectifier diodes. A heat sink for one transistor that got rather hot was an obvious improvement.

This is not a cheap product and I now have the best bass from my big vented subs that I ever have had. Volt EV 3143 woofers in 200 lbs each enclosures and then Accutone C220 drivers in closed pentagonal cabinets reinforced with slate and granite. Crossover at about 80 Hz.
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Old 3rd February 2008, 08:42 PM   #13
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Quote:
Originally posted by Cal Weldon
Are you looking for one of these?

http://www.reckhorn.com/index.php?ln=en&prod=b1

I have one of those here to play with. They also have an F1 that has high pass but no EQ.

dave
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Old 3rd February 2008, 08:51 PM   #14
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I have one as well but haven't had a use for it yet.
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Old 5th February 2008, 12:46 AM   #15
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The Reckorn looks like the right piece of EQ. The review posted didn't sound all that great, but thats all I'm looking for is a X-over so it seems like it will work.

The Application is 2 15" IB subs per side of a Dipole project. So I do need stereo since the X-over point will be some where in the 80-120hz range.
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Old 5th February 2008, 01:09 AM   #16
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I would have gone for this:

Omnes Audio DBC 12 costs 355 Euro and is very flexible so that you can even choose the sloop for the low pass filter.

In my opinion there is no use for subsonic filters for a sub like yours . It will impair the phase response to no good.

If you use a record player a subsonic filter in the RIAA stepup amp may be a good thing.

Sorry; this is in German but ....

http://www.lautsprechershop.de/pdf/o...dpc_12_man.pdf

I think this is a good thing; Delay von 0 bis 300cm zur Kompensation von Laufzeitunterschieden

Delay to compensate for different ....(sorry too tired to translate from German to Enlish just now)
• Drei parametrische Equalizer mit –6dB bis +6dB Regelbereich

Three parametric Equalisers....

a good thing to be able not only to boost the bass response with these but to lower it as well as room modes are always there.
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Old 5th February 2008, 06:06 PM   #17
hum4god is offline hum4god  United States
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Default low pass crossover

the Omnes Audio DBC 12 looks interesting but 355 euro and you still need a power supply .
and it converts the signal from analog to digital and back to analog .

anyway it would be interesting to hear someone share their experience with it .
how does it differ from a behringer dcx 2496 in sound ?
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Old 6th February 2008, 04:03 AM   #18
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One great feature is the remote control. As an alternative you can use it with a computer with a RS 232 or USB interface.

I don´t know the quality of sound as something will be lost because of the AD DA conversion.

The version with a built in class D power amp was reviewed in the German speaker building (mostly) magazine Klang+Ton
# 3 2006. This mag isn´t the most critical I´ve encountered but they do a good job I believe. They liked it.

Here´s the pricing from a German company called Iris Strassacker.
The power supply is only 9 Euro.

Omnes Audio DPC 12-Subwoofer-Vorverstärker EUR 256,00
Omnes Audio DPC 12-Subwoofer-Vorverstärker / Stereo
(getrennt geführte Kanäle für 2 Subwoofer in Stereobetrieb) EUR 355,00
dazu das passende Netzteil mit 12V=, 500 mA, stabilisiert: EUR 9,00
Standard 9V Batterie für die Fernsteuerung (liegt leider nicht bei) EUR 3,80
falls Sie keine freie serielle Schnittstelle im PC haben: USB-Adapter EUR 18,00

A link to this company: www.lautsprechershop.de but please note this site is (like for some reason many German sites a bit primitive) Thus you have to click on (Verstärker) Subwoofer Module and then Omnes Audio (which company has its own web site at):http://oaudio.de/index.php/cat/c52_A...4uu347m5cd35u7

Where there is in fact a short review. Can translate it some day, as there is late night here in Sweden and I will check the elections in the USA.

I have no interest in neigther company but is a bit curious about this product. I´m helping a friend to build laudspeakers and a sub and we may use the crossover with the power amp option.
Will look at the German forum where I´m a member as well to see if I can find out something about it.

The danish hi-fi guru Peter Lyngdorf advocates really steep sloops for the subs which he on the other hand uses up to about 300 Hz and in addition prefers to place them in the corners of the room. This requires DSP and Lyngdorf sold his interests in the Tact company and instead started the Lyngdorf Company, but room correction is still in focus.

As the Omnes crossover lets you use up to 36 dB/ octave filtering
you may be able to use the cheaper mono version?

BTW: here´s another advanced crossover....

http://groundsound.com/dcn23.html
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Old 6th February 2008, 04:44 AM   #19
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Found a lot about the Omnes Crossovers at HIFI-FORUM.
For instance this:

http://www.hifi-forum.de/viewthread-104-6727.html

And there is a lot more.

Any German member who can make a summery? Takes me a week to read it all.....
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Old 6th February 2008, 11:49 PM   #20
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Is there any US distributor of Omnes products. All the things I found were in Europe.

This also looks like a nice piece if EQ.
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