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      01-16-2021, 05:28 AM   #1
richard_tricky
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Logic 7 Under-seats & amp suggestions - DSP?

Hi all, ive read through the guides and want to swap out my logic 7 under-seats with some suitable options.

Ive already got the technic add a sub harness.

Would the SWS 8 - 4ohms and the kicker key 500.1 do the job?

I was also looking at Eton plus a small 2 channel amp

Any other susgestions? focal?

or are there better options these days? Do i need to DSP the underseats or will adding just an amplifier be ok?

Thanks
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      01-16-2021, 07:50 AM   #2
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Quote:
Originally Posted by richard_tricky View Post
Hi all, ive read through the guides and want to swap out my logic 7 under-seats with some suitable options.

Ive already got the technic add a sub harness.

Would the SWS 8 - 4ohms and the kicker key 500.1 do the job?

I was also looking at Eton plus a small 2 channel amp

Any other susgestions? focal?

or are there better options these days? Do i need to DSP the underseats or will adding just an amplifier be ok?

Thanks
The Jehnert xe 200's are the very best under the seat subs for the e90 money can buy.

There is only 1 dealer in the US that sells them. Be prepared to spend $450.00 or so.

https://unexpectedcreations.com

With that said, if you have the ski bag option, I'd highly suggest getting a trunk, corner mounted enclosure made of fiber glass. Maybe put a 10 or 12" JL-Audio sub in there.

https://www.ebay.com/itm/BMW-E90-3-S....m46890.l49292

The under seat subs are meant to be "mid-base" subs not Subs.
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      01-16-2021, 08:06 AM   #3
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Thanks for that. I'm based in the UK so I'll have a look here.

So would I be better going with an enclosure and a trunk sub?

I know the logic 7 is not great but I want a decent low end I'd thought I'd be happy with just some underseat replacements.

But if the trunk sub is a better starting point then I'll go that option instead.

I'm thinking a JL sub 8 or 10 with a mono bloc amp?
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      01-16-2021, 10:35 AM   #4
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If you are looking for better low range bass only better to do that with
dedicated sub and sub amp. Trying to run the underseats as a true
sub is not a great direction for this.
If you want accurate mid range to lower frequency's then modify the underseats.
Earthquakes more bass.
Jenherts exquisite accuracy and depth across the range it covers.
If you are not a base head upgrading the underseats are enough and they do
produce some bass but it's not ghetto bass it's audiophile bass for Jehnerts .
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      01-16-2021, 11:09 AM   #5
richard_tricky
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Ok thanks. I'm not a bass head. I like a good sound in my car. I might just try the The underseats with an amp and if I'm not happy then start looking at a bigger solution
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      01-16-2021, 02:15 PM   #6
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Quote:
Originally Posted by richard_tricky View Post
Thanks for that. I'm based in the UK so I'll have a look here.

So would I be better going with an enclosure and a trunk sub?

I know the logic 7 is not great but I want a decent low end I'd thought I'd be happy with just some underseat replacements.

But if the trunk sub is a better starting point then I'll go that option instead.

I'm thinking a JL sub 8 or 10 with a mono bloc amp?
Jehnert xe 200's are very common in the UK. Also, the corner mounted enclosure I gave you is also made the the UK.

I would think you'd want a 4 + 1 channel amp to run the underneath the seat subs & the corner mount.

Just make sure the RMS matches the subs.

Ex- if the sub channel (+1) is 300w RMS, then you want a 300w RMS sub.

Look at JL Audio or Alpine for amps.

I have a 10" sub corner mounted sub in my car.

I don't even have it turned up all that much & it provides more than enough base.
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      01-16-2021, 04:35 PM   #7
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You didn't really make it clear as far as I can tell which system you are starting
out with. I know you said you had logic 7 underseats in the first entry but does
that mean you have a logic 7 system or is that just and assumption.

List everything you already have and more important which of the three systems
you started out with.

And by system I mean
stereo = no amp no tweeters.
Hi Fi = 6 channel analog amp with very weak outputs.
Top Hi Fi = logic 7 9 channel amp with fiber optic inputs .
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      01-17-2021, 06:42 AM   #8
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Hi apologies I have the logic 7 system as standard option 677? My chassis number is a000114 if that helps.

Generally the logic 7 system sounds ok ish to me but is lacking in deep low bass. Not the boomy sort.

My previous cars always ran sealed sub boxes as I preferred the sound from them.

I'm just wondering if the jenherts would be enough or go with a JL sub in the trunk
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      01-17-2021, 09:59 AM   #9
ctuna
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The Logic 7 system in my opinion is not that great .
At least spec wise they play a trick on you when they list the power.
At rated power the power chips that actually power the channels
are at 10 PERCENT distortion. It's biased toward surround sound
not stereo . Typical marketing tricks along with counting tweeters
as speakers . All manufacturer's are in the alternate facts zone
on there stereo's now.

How do I know I have looked at the specs from the chips.
entry 18 in the above the links for the chips are there.

https://www.e90post.com/forums/showthread.php?t=1144129

The thing is do you just improve the underseats or add a sub and call it a day
or do you overhall/remove the whole thing. I would think about new front door
speaker to if your going to do this.

Mobridge now has an all in one drop in replacement for the Logic 7 amp compatible with optic inputs with
DSP . (8 channels only but has a sub amp channel to) But I have know idea if it's any good. Better ask Don at Unexpected Creations he might have an idea if it's any good.

Last edited by ctuna; 01-17-2021 at 03:26 PM..
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      01-17-2021, 03:18 PM   #10
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The simple option with the best results for the logic 7 (as mentioned above) is a dedicated subwoofer using a technics integration harness. I have tried the Earthquake subs and gladen subs and logic 7 woofers both with aftermarket amplification. Of the three, the stock logic 7 woofers are still 10x better at handling amplification and sound better doing it. I finally settled on gladens (3 way components)in my 118i with an aftermarket subwoofer and in my 335i I ended up retrofitting the Individual audio with an aftermarket dedicated subwoofer.
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      01-17-2021, 05:58 PM   #11
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Great. Thanks guys. Appreciate the input and real world experiences from other owners.

I'll go off and look.

I'm guessing a JL sub in a custom enclosure as above is a good option.

Any other recommendations for subs. A 10" driver being the smallest?

Thanks
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      01-19-2021, 11:19 AM   #12
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The under-seat speakers are woofers, not subwoofers, and won’t give you much on the very low end. They are also in a less than ideal location and the shallow available mounting depth limits replacement options. Some 8 inch drivers may be able to dig deep but they tend to have a mounting depth inches over available installation space.

I started by adding a trunk mounted subwoofer in my E92 while also adding a band-pass filter and external amplification to the existing under-seat woofers. I had Musicar NW do the install but they sell kits for DIY.

Full-Bass-Package - Full Bass Upgrades turn your BMW 3-way speaker system into a true 4-way system, with dedicated mid-bass speakers and a dedicated trunk sub-woofer. We don’t just add a sub – we also enhance the performance of the under seat woofers in a few ways:
• We “band-pass filter” them, taking the sub-bass notes out so that only the trunk sub-woofer plays them
• We improve the power to the under seat woofers
• We make them “tunable” to match the rest of the system
The signal and under seat speakers are interfaced using a plug-and-play harness (no cutting) which we prep for the specific system. Then the new amplifier’s internal active crossover filtering routes middle-bass notes to the under seat woofers, and sub-bass notes to the new sub-woofer in the Musicar OE-Look Subwoofer Enclosure.


This was a big improvement and added all the low end I could want but I still wasn’t satisfied with the sound so added a full cabin upgrade, replacing the under-seat woofers with Jehnert XE200’s and replacing the front stage with Morel Hybrid 402 Component speakers, additional amplifiers and a DSP. I am now satisfied with the system sound.

While the Jenherts’ are fantastic woofers, there are arguably better options; here are a two additional under-seat woofer options, Audio Development W800NEO’s and Illusion Audio C8 woofers. I use the C8’s in my X6. I assume The Focal Utopia M 8WM’s would be amazing but while the other options aren’t cheap, the Utopia’s cost even more.
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      01-19-2021, 12:31 PM   #13
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This might be good stuff but where getting into the high end boutique stuff.
I have Jehnerts and Morels and I got to say they are way beyond my expectations.
Only powered by a JL xd 600/6 . I spent around 1500 on parts and self installed.
Most people are expecting to pay as little as they can, often to improve the horrendous
sound of the base system and more often to add an Nav or Features.
I was reluctant to spend the 1500 but I wanted to do right the first time and only
once.
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      01-19-2021, 02:49 PM   #14
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I am also running a Musicar NW enclosure but added a JL Audio 10w3v2 running on an audio control acm-300.1 mono amp. In my opinion, the sub/amp combo is a perfect match.
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      01-23-2021, 01:47 PM   #15
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Quote:
Originally Posted by ctuna View Post
This might be good stuff but where getting into the high end boutique stuff.
I have Jehnerts and Morels and I got to say they are way beyond my expectations.
Only powered by a JL xd 600/6 . I spent around 1500 on parts and self installed.
Most people are expecting to pay as little as they can, often to improve the horrendous
sound of the base system and more often to add an Nav or Features.
I was reluctant to spend the 1500 but I wanted to do right the first time and only
once.
Isn't it good to drive an AB class for the front line aprox. JL slash ... or ZAPCO
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      01-23-2021, 04:19 PM   #16
ctuna
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Yes if your an ultra purist you might make these considerations.
I was somewhat skeptical of class D when I was first considering these
things. But Class D's are now as good as anything and have been for
some time.

Most of the holdout manufacturer's that used to only do boutique class A or
some combination like class G now are doing class D's
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      01-24-2021, 08:48 AM   #17
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Quote:
Originally Posted by ctuna View Post
Yes if your an ultra purist you might make these considerations.
I was somewhat skeptical of class D when I was first considering these
things. But Class D's are now as good as anything and have been for
some time.

Most of the holdout manufacturer's that used to only do boutique class A or
some combination like class G now are doing class D's


I bought the low model RD400 / 4 for testing to make some comparison with my previous ZAPCO soon after I receive it I will give an opinion the difference between RD and HD is not as big as I look Damping Factor and S / N Ratio is a same
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