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Thread: Underseat subs TA and tuning

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    Underseat subs TA and tuning

    Running the Focal iSub twin underseat units.

    For TA measurement (with a tape) is it the horizontal length from ear or should I measure from ear to speaker (eg vertical for the drivers side)?

    Have it crossed around 160hz but there is some pulling down of the soundstage so may try overlapping crossover with the mids (door mounted in factory location).


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    Re: Underseat subs TA and tuning

    Quote Originally Posted by SiW80 View Post
    Running the Focal iSub twin underseat units.
    For TA measurement (with a tape) is it the horizontal length from ear or should I measure from ear to speaker (eg vertical for the drivers side)?
    Have it crossed around 160hz but there is some pulling down of the soundstage so may try overlapping crossover with the mids (door mounted in factory location).
    Sorry cant answer your question as i used SMAART to set my TA for the underseat subs in my set up.. But i wanted to ask how your experience has been with the iSub's under your seat so far? I am currently running the JBL Fuse undermine and have contemplating replacing with the iSubs

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    Re: Underseat subs TA and tuning

    I only threw them in (no treatment in the car) and running off a Pioneer GM-D1000 micro amp but quite impressed. Definitely better when the volume is turned up!

    I got these to replace a 8” active Alpine in the boot and they improve the midbass and upper sub bass but not below 40Hz I would say.

    Great midbass and lots of kick. Much better than 2 way with my 5.25” Oz mids!

    The floor under my seats has a plastic air vent so they are partly sat on that which isn’t ideal.

    They are a little boomy at specific frequencies in certain tracks, but no EQ or anything done and not ideal mounting. I need to get RTA measurements to see what’s going on.

    I can’t get the JBL’s in the UK so tried these.

    Have some HAT U69’s in the loft I want to compare these against in small boxes but no time yet.


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    Re: Underseat subs TA and tuning

    i usually do it by ear.

    i do them separately (or together if mono). i mute all but one midbass and the nearest sub(s). then i find/use a track with a kick drum (first 90 sec on hotel california / hell freezes over works). i adjust the sub time alignment until the sub sounds aligned with the midbass; sub plays lower frequencies of the kick and midbass plays upper frequencies of the kick.

    once i think i've got it right, i mute the first midbass and unmute the other midbass to make sure it's still aligned.

    if it's stereo sub, i start by copying the nearest sub's TA to the farthest sub's TA. then i repeat the steps above process for the other side.

    once it's locked in, i link the sub channels' TA together so any TA/phase adjustment moves them together.

    finally, i play with sub levels and eq to get it integrated well. songs with linear bass sweeps help (lindsey stirling's we found love work well) and kick drums (rage's take the power back, lake street dive's rich girl)

    we did this w/ rton20s' 3-way system (illusion tweeters, illusion c5s on the dash, and 10" subs under the front seats) this way. given the c5s weren't big door/kick mounted midbasses, we needed the subs to play well into midbass range, including the stereo signal. they rolled off naturally around 160hz under the seats and integrated well w/ his 5s on the dash.

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    Re: Underseat subs TA and tuning

    How about TA between under seat sub and mid range?


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    Re: Underseat subs TA and tuning

    i do the front stage first, sub(s) muted. i do the sub integration last.

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    Re: Underseat subs TA and tuning

    (well, rear-fill is last, but not all cars have it)

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    Re: Underseat subs TA and tuning

    You so need to have a drive up si! Over Xmas would be good if you get a day spare, I’ll get the timing/phase nailed, pulling down of the soundstage is just levels and phase, that I can sort

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    Re: Underseat subs TA and tuning

    Quote Originally Posted by dumdum View Post
    You so need to have a drive up si! Over Xmas would be good if you get a day spare, I’ll get the timing/phase nailed, pulling down of the soundstage is just levels and phase, that I can sort
    Would be best as you say

    Will let you know!


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    Re: Underseat subs TA and tuning

    Quote Originally Posted by Cutaway View Post
    Sorry cant answer your question as i used SMAART to set my TA for the underseat subs in my set up.. But i wanted to ask how your experience has been with the iSub's under your seat so far? I am currently running the JBL Fuse undermine and have contemplating replacing with the iSubs
    Once you have experienced smaart.....you never go back

    Although than you have to learn new tricks.....which can be challenging. Like how to actually use all pass filters and polarity swaps to your advantage.
    2014 F150 Limited -> Kenwood DDX-9907xr -> Helix DSP.2 -> Alpine PDX-V9 -> SI M25 mki in Valicar Stuttgart Pods, Rear SB17's, Sub SI BM MKV's in MTI BOX. Alpine PDX-F6 -> SI Tm65 mkIV, SI M3 mkI in Valicar Stuttgart Pods

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