Two ported, different size subs - Home Theater Forum and Systems - HomeTheaterShack.com

 
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post #1 of 8 Old 12-03-14, 12:29 PM Thread Starter
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Two ported, different size subs

All,

I currently am using a Fi Q15 in a sealed sub and am getting the itch to add more. I have thought about moving the Q15 to a MartySub configuration and also adding a SI HT18 and putting that in the Marty Full. Would the Q15 perform decently in the Marty Cube? I know I will have some work to do to get them to harmonize well, but will this combination be cohesive? I will be running these with an inuke 6000DSP.

PS: I'm looking at the Marty builds because my father is wanting to build them for me and he liked them quite a lot.

PPS: The Q15 is a 2ohm DVC so I would assume I should purchase the D2 version of the HT18

Last edited by Rhuarc; 12-03-14 at 03:11 PM.
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post #2 of 8 Old 12-05-14, 04:31 PM
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Re: Two ported, different size subs

Quote:
Rhuarc wrote: View Post
All,

I currently am using a Fi Q15 in a sealed sub and am getting the itch to add more. I have thought about moving the Q15 to a MartySub configuration and also adding a SI HT18 and putting that in the Marty Full. Would the Q15 perform decently in the Marty Cube? I know I will have some work to do to get them to harmonize well, but will this combination be cohesive? I will be running these with an inuke 6000DSP.

PS: I'm looking at the Marty builds because my father is wanting to build them for me and he liked them quite a lot.

PPS: The Q15 is a 2ohm DVC so I would assume I should purchase the D2 version of the HT18
Hi Andrew, what is a Martysub, or at least your definition of it? There seems to be several threads, none definitive that I could find. Thanks

AJ

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post #3 of 8 Old 12-06-14, 04:06 PM
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post #4 of 8 Old 12-09-14, 11:22 AM Thread Starter
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Re: Two ported, different size subs

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ajinfla wrote: View Post
Hi Andrew, what is a Martysub, or at least your definition of it? There seems to be several threads, none definitive that I could find. Thanks
To me, all a Marty sub is, is a pre-defined sub box, with known internal cu ft, cut list, etc. Basically, makes building a sub box very straight forward, especially for those that haven't built one before. For me, my father wanted to try his hand at one, so that seemed a nice place to start. If you look at the Martysub FAQ page, http://www.avsforum.com/forum/155-di...tysub-faq.html, it has a list of the various sizes (sorry if I shouldn't be posting from AVS).

I'm going with a "MiniMarty", a 9.0 cuft box with a SI HT18. I decided to sell my Fi Q15 and get another SI HT18 when it sells, so I would have a matching set. I also decided to hold onto my EP2500, and use that to power both of the subs, coupled with a minidsp for EQ and HPF. If I end up needing more power in the future, I can always move up to an inuke 6000.
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post #5 of 8 Old 12-12-14, 12:46 PM
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Re: Two ported, different size subs

Are you intending to add a second sub to your system ? I tried that for a while with two different sized subs and found myself chasing my tail when it came to trying to get a balanced sound. My two cents.
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post #6 of 8 Old 12-12-14, 12:49 PM Thread Starter
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Re: Two ported, different size subs

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istvan wrote: View Post
Are you intending to add a second sub to your system ? I tried that for a while with two different sized subs and found myself chasing my tail when it came to trying to get a balanced sound. My two cents.
As it stands, I'm building one sub for the time being. Working on selling my Q15, once that happens I'll be building another matching HT18. I picked up a minidsp and grabbing a umik-1 shortly, so hopefully that will help me attain a nice balance when I have two subs involved.
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post #7 of 8 Old 12-12-14, 12:58 PM
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Re: Two ported, different size subs

I ended up putting the smaller one on my centre channel. It gives it a bit of "je ne said quoi". Morgan Freeman never sounded better.
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post #8 of 8 Old 02-15-15, 06:02 AM
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Re: Two ported, different size subs

I'm with istvan here but wan't to clarify it up a little more to you. Combining different subwoofers (especially vented ones) causes some trouble with phase/group delay in most cases. With standard filters and EQs you cannot correct this. To my knowledge you will need FIR filters there which only the OpenDRC and Dirac-Series by minidsp are capable of (there are other DSPs too but you mentioned minidsp in your posts). A whole lot simpler (and hopefully without disappointments) you could reach the aim with identical subwoofers (both in chassis and enclosure) while also taking care of symmetrical positioning in your listening room.
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