Looking for Opinions on Setup using 4 Sealed Mach 5 FTW 21" Sub Woofers

[lovinthehd]

The only ported subs I have seen , were commercial, store bought ones and they sounded ok, but just not the sound I wanted. The issue I would run into using a ported box is I dont have the room for 4 ported refridgerator size boxs lol So I am just going to do sealed and see where this takes me.

Did you look at the SPL modelling graphs for the 4 subs I posted?

How does it look to you?


Its my first attempt at sub moddeling and, It seems like a tonne of output right from 10 HZ right up to my crossover at 80hz.

This will definitley have more output than my 2 paradigm x12's

Thought you just posted a single box sub with four drivers....how different from four boxes am not sure otoh. What do you plan to do for eq to flatten response?

 

[lovinthehd]

I have not modeled the room, but It sounds like I had better learn to figure that one out too lol

I do have REW on the laptop and was going to get a umik 1 microphone as I believe I need to use REW to setup the MINI DSP Flex HTx with it.

After that is setup, I will be using the ARC room correction on my Anthem reciever to dial the room in.

I will likely set it up the way I desrcibed first and see how it sounds before I play with it and start moving the subs around.

The room modeling is just a feature of REW, doesn't require a mic.

 

[lovinthehd]

The only ported subs I have seen , were commercial, store bought ones and they sounded ok, but just not the sound I wanted. The issue I would run into using a ported box is I dont have the room for 4 ported refridgerator size boxs lol So I am just going to do sealed and see where this takes me.

Did you look at the SPL modelling graphs for the 4 subs I posted?

How does it look to you?


Its my first attempt at sub moddeling and, It seems like a tonne of output right from 10 HZ right up to my crossover at 80hz.

This will definitley have more output than my 2 paradigm x12's

Not familiar with the Paradigm X12s in any case otoh

 

[TLS Guy]

So let me ask you a different way.

You do seem knowlegable on this stuff.

Lets say, hypothetically I havent purchased any subs.

What would your reccomendation be for subs , boxes to do 4 sealed boxes in my listening area?

I have no issue learning a few things or taking advice either. Just didnt expect to have this idea completley trashed, when its a big hit elsewhere

I have no idea yet, until I do some serious calcula

Here is my first attempt at WIN ISD. I put as much information as I had and set the imput at 600 watts, half of what the sub is capable of. I went with a 6.2 cubic foot sealed box. This is a really nice SPL graph on this sub and this is exactly how I was told the sub would perform.

94 DB at 10 HZ
104 DB at 20 HZ

I am not 100% certain I did this properly but I did my best to get it as accurate as I could

That looks very much like my very rough calculation. I anticipated a 3db point just below 50 Hz, and it is. As it should for a sealed enclosure it is rolling off at 12 db. per octave. So, I have to congratulate you on your first model. You are showing definite promise as a speaker designer.

So what we need to see is how much LF boost can be applied before the driver runs out of xmax. I have had a long day. My wife did not get into the operating room until this afternoon. As usual after surgery she is pretty miserable this evening. I hope to bring her home tomorrow, but will be very much preoccupied. I will model ported and sealed enclosures for you, but please be patient at this time. It will be a day or two before I can devote serious time to this. Ported enclosures properly designed are NOT boomy. I have not had that complaint from members I have done designs for over the years.

 

[lovinthehd]

I have no idea yet, until I do some serious calcula


That looks very much like my very rough calculation. I anticipated a 3db point just below 50 Hz, and it is. As it should for a sealed enclosure it is rolling off at 12 db. per octave. So, I have to congratulate you on your first model. You are showing definite promise as a speaker designer.

So what we need to see is how much LF boost can be applied before the driver runs out of xmax. I have had a long day. My wife did not get into the operating room until this afternoon. As usual after surgery she is pretty miserable this evening. I hope to bring her home tomorrow, but will be very much preoccupied. I will model ported and sealed enclosures for you, but please be patient at this time. It will be a day or two before I can devote serious time to this. Ported enclosures properly designed are NOT boomy. I have not had that complaint from members I have done designs for over the years.

Keep in mind that the general rules of amplification apply,, to raise spl by 3dB requires a doubling of power.....

 

[Eppie]

Welcome to the forums @Allen Vos.

@TLS Guy : I assume you got the parameters from https://www.mach5audio.com/product/ftw-21/

It says that the sub is optimized for sealed enclosures so I'm curious to see whether your calculations confirm that. I didn't know that we had a subwoofer manufacture in Winnipeg, Manitoba, of all places. I knew about Funk Audio in Alberta but it's nice to see some home grown manufacturing.

P.S. Hope the missus is doing ok.

 

[TLS Guy]

Welcome to the forums @Allen Vos.

@TLS Guy : I assume you got the parameters from https://www.mach5audio.com/product/ftw-21/

It says that the sub is optimized for sealed enclosures so I'm curious to see whether your calculations confirm that. I didn't know that we had a subwoofer manufacture in Winnipeg, Manitoba, of all places. I knew about Funk Audio in Alberta but it's nice to see some home grown manufacturing.

P.S. Hope the missus is doing ok.

Actually that was pretty obvious from the T/S parameters, as it is a high Qts driver.