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-   -   subwoofer equalizer? (https://www.avsforum.com/forum/155-diy-speakers-subs/3089550-subwoofer-equalizer.html)

thejck 09-08-2019 12:36 PM

subwoofer equalizer?
 
i am doing an infinite baffle build with 4 ib3 v2 18's drivers in an opposed manifold.
driven by an ep4000

I am trying to decide between the
FBQ2496
DEQ2496
minidsp balanced
or
minidsp HD

to equalize this thing.

The FBQ seems to be the cheapest at about 100 but for 90 more I can get the DEQ or the minidsp HD.

Are they worth it? what are the advantages of the minidsp and the DEQ. The Deq would be more suitable in a sealed system with its ability to provide "shelves" for LT?
Seems like the FBQ might have more filters than the minidsp.
What am i missing?

Wayne A. Pflughaupt 09-09-2019 05:07 AM

I’d pass on the DEQ. For what you need, it doesn’t do anything that the FBQ doesn’t.

The miniDSP offers more flexibility and a more intuitive interface, if you don’t mind breaking out a computer to make adjustments. You’ll have to study the features between the various mini options to determine which one you need. Six filters are plenty for subs, any more and you’ll tend to over-equalize.

Regards,
Wayne A. Pflughaupt

thejck 09-09-2019 06:44 AM

Quote:

Originally Posted by Wayne A. Pflughaupt (Post 58532304)
I’d pass on the DEQ. For what you need, it doesn’t do anything that the FBQ doesn’t.

The miniDSP offers more flexibility and a more intuitive interface, if you don’t mind breaking out a computer to make adjustments. You’ll have to study the features between the various mini options to determine which one you need. Six filters are plenty for subs, any more and you’ll tend to over-equalize.

Regards,
Wayne A. Pflughaupt

thank you. i think i will start with the FBQ since I already ordered it. I will read more about the minidsp to see if there is something I need. I guess once I have everything up and running time will tell if I am needing a different tool

thejck 09-17-2019 09:38 PM

Is anyone familiar with the parallel mode of the ep4000 amplifier?
does it matter what input is used when set to parallen mode (non mono)
i want to run 2 seperate inputs from 2 seperate setups to my amp

amp will be setup to drive 2 sets of 2 ohm drivers in parallel mode.

i was reading about how you can equalize both channels of the fbq2496 seperately and thus get 2 sets of eq for stereo and for HT

I have 2 separate stereo preamp and a ht 7.1 processor. that i wanted to run to 1 each to the 2 channels of the fbq

If i ran the sub out from each of those to the 2 inputs on the fbq and I run the 2 outputs of the fbq to the ep4000 in parallel mode. will it only play the input that is currently active and has a signal.
or will it cause some damage to the other input that is inactive

BassThatHz 09-18-2019 02:30 AM

I've used the older FBQ and the current DEQ and DCX.

I know that in the DCX you can sum at least 2 inputs. Not sure about the FBQ, but my guess would be no.

The DCX has 3 inputs (although only 2 are of high quality), it has 10 PEQ filters and 3 DEQ filters and 2 crossovers per channel.
The FBQ and DEQ doesn't have any crossovers.

I've always programmed by filters manually, so not having rew integration doesn't bother me any.
You can of course still use rew to provide you with with the same eq suggestions.

None of these devices are overly complicated...
You select the filter ID, select the frequency center you want, the gain/cut amount, and the frequency bandwidth.

That's it, your done.
Click commit preset to memory.

The changes are applied it realtime, so make SURE that the gain is zero'ed (or at least not high) before moving the frequencies around, the electronics will be fine but the drivers may or may not survive. (Especially tweeters...)

My old FBQ used to pop when power cycled, not sure if the 2496 has the problem or not. One solution is a simple UPS and never turn it off (or use the first on, last off principle; and risk pops during power outages. Up to you...)

The miniDSP can EQ to 10hz (although not accurately I've heard), where as the Be's stop at 20hz generally.

Actually the DCX does have REQ integration but requires the use of a serial port to usb port adapter (not the end of the world.)
I did try it and it works, but I prefer manual because I'm old school.

Wayne A. Pflughaupt 09-18-2019 11:36 AM

Quote:

Originally Posted by thejck (Post 58573046)
Is anyone familiar with the parallel mode of the ep4000 amplifier?
does it matter what input is used when set to parallen mode (non mono)
i want to run 2 seperate inputs from 2 seperate setups to my amp
______________________

If i ran the sub out from each of those to the 2 inputs on the fbq and I run the 2 outputs of the fbq to the ep4000 in parallel mode. will it only play the input that is currently active and has a signal.
or will it cause some damage to the other input that is inactive


The purpose of parallel mode is to get output to both channels with a single input. It basically functions like an internal “y” splitter cable. This feature is also known as “dual mono” mode.

If you want fully independent control of both channels, use stereo mode.

Regards,
Wayne A. Pflughaupt

thejck 09-18-2019 01:39 PM

Quote:

Originally Posted by Wayne A. Pflughaupt (Post 58575516)
The purpose of parallel mode is to get output to both channels with a single input. It basically functions like an internal “y” splitter cable. This feature is also known as “dual mono” mode.

If you want fully independent control of both channels, use stereo mode.

Regards,
Wayne A. Pflughaupt

no i dont think i am being clear

my sub has 4 drivers total

ep4000
- channel 1 - 2 drivers of my sub
- channel 2 - 2 drivers of my sub

EP4000 in parallel mode so that both channel is playing the same thing

fbq channel 1 input from my 7.1 preamp
channel 2 input from my 2.1 preamp

each channel of FBQ equalized seperately

FBQ channel 1 output to channel 1 of ep4000
fbq channel 3 output to channel 2 of ep4000

i want to know if this would work. So the FBQ will only have 1 side active at a time and i want that side to play on both channels of the ep4000

Wayne A. Pflughaupt 09-18-2019 06:59 PM

That won’t work – look at my description above of what parallel mode is.

You need a line-level A/B switch (two inputs switched either/or to a single output) between the FBQ and the amp.

Regards,
Wayne A. Pflughaupt

BassThatHz 09-18-2019 09:15 PM

1 Attachment(s)
As I mentioned, the DCX can do this, and I believe the miniDSP can too.

But you already bought the FBQ, clearly without fully reading the user manual and searching for a suitable match to the feature set you needed.

https://www.avsforum.com/forum/attac...mentid=2617378

thejck 09-18-2019 09:52 PM

i am confused. are you refering to crossovers?
is that what the fbq doesnt have?

thejck 09-29-2019 07:53 PM

i am planning on returning the FBQ2496.

and going with the minidsp. because I need some sort of crossover after all.

I have 2 setups.
1. A HT 7.1 processor feeding the sub.
2. a 2 channel stereo preamp feeding the sub

Can i direct both those sourses into a minidsp. that will then feed the ep4000 amp for the sub? each used mutually exclusive

Can the source from the 2 channel preamp have a low pass crossover? so I can cut out the higher prequencies from the sub with it?

Can I get away with the minidsp balanced. since i am only going to eq the sub with it and use a crossover on one channel?

thejck 12-02-2019 08:22 AM

I am trying to integrate my subwoofer into my 2 channel stereo preamp/dac

My preamp has 2 sets of outputs XLR+rca. i use the XLR to my poweramp for my 2 main speakers. I was hoping to use the rca output to send to a device like the minidsp and use the crossover and eq for my sub output. My mains can go pretty low so I was just wanting to use the sub to compliment some of the lower frequencies.

In order to adjust phase and time delay do i just use the time delay setting in the minidsp?

Since my speakers are about 3-5 feet closer to my main listening position than the sub is there a need to delay the mains? I wont be able to do this unless I add the minidsp in FRONT of the preamp? in which case I would have a problem with volume control.
I am planning on crossing over at around 50hz so is there any actual need to time match the subs with the mains at that low frequencies?


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