2- IB315 in the trunk

[edouble101 314]

Hell of a mount, way to improvise and be creative

 

Thanks!

[edouble101 314]

The amp install is complete!

 

 

 

 

 

 

 

After three hours or so of tuning with the subs I am very pleased. I have not achieved the "up front" bass yet but I am hoping I will get that figured out. Initial impression they sound fantastic. IB gives me a new perspective on low bass. I never had an install that was this smooth sounding. The output level is equally impressive. I think it could hit 140db.

[edouble101 314]

http://www.youtube.com/watch?v=VYYtsi8n0rE

[S.DeYoung 967]

Diggin it man. Install looks very nice. I love how your trunk is fully functional. Do you want to do some fabrication work for me?  

[edouble101 314]

Diggin it man. Install looks very nice. I love how your trunk is fully functional. Do you want to do some fabrication work for me?  

 

 

Sure thing man. If you need something fab'd up I would be glad to help!

[Truconcept 58]

nice build im jelly

 

are you running your subs free air? 

[Tirefryr 1,742]

nice build im jelly

 

are you running your subs free air? 

 

Dude. . . . . .

[edouble101 314]

nice build im jelly

 

are you running your subs free air? 

 

Infinite baffle = free air with a baffle separating the front wave from the rear wave.

[Truconcept 58]

nice build im jelly

 

are you running your subs free air? 

 

Infinite baffle = free air with a baffle separating the front wave from the rear wave.

 

oh thanks

[Shogen 325]

good God!!! fcking awesome man!

[edouble101 314]

good God!!! fcking awesome man!

Thanks!

My wife its going to give birth to our daughter within the next few weeks. I will get ahold of you shortly after for a meet up!

[gprestonmoto 89]

So I'm at work, and I definitely didn't plan on spending 2 hours reading through this here porn thread.... Thanks for the show though.

[Shogen 325]

good God!!! fcking awesome man!

Thanks!

My wife its going to give birth to our daughter within the next few weeks. I will get ahold of you shortly after for a meet up!

 

Congrats! Yea, let me know...... I'm hoping I get this job with Google 3rd party so I might have some work done on the Camry by then

[edouble101 314]

I readjusted the gains on my KS900.6. I used two 8 ohm non-inductive dummy loads wired together for 4 ohms, a hand held o-scope and DMM. I had previously set the gains with a DMM only. It turned out that the midbass channels on the KS900.6 was set at a whooping 20 watts :surprised: at my max listening volume (42/62). Needless to say that the midbass output is much improved now The ZR800's still drop on their face from 100hz on down. I do not see how anybody can say they have good bass output. 

 

I setup my desktop with a M-Audio 192 soundcard. I calibrated the soundcard and used the desktop for today's measurements. I also took the same measurement with my laptop. I simply unplugged the USB from the desktop and plugged it into the laptop. No other changes. Other than the overall level the graphs are pretty similar, close enough for my garage testings. The biggest change is on the laptop around 20khz. 

 

The green plot is the laptop, the purple plot is the desktop.

 

As you can see the plots aren't perfect. I did my best with level setting, phase and xover points to get the graph as smooth as possible without EQ. I could not tame the subs under 40hz, lots of cutting. 32hz seems to be the resonant freq for this car. All sub systems I've had peaked there. Boosting at 63hz, cutting at 80hz. I could not get 320hz to budge :confused: 640hz was another issue. 10khz on up needed boosting as well. Even though the substage/midbass are nearly 20db louder than the mids/highs I think it sounds like it should.

 

Here are the plots of the all drivers running full range (except tweets). This helped me choose my xover points.

 

 

The final xover settings were decided on based on max levels on the RTA. From 50-100hz was always an issue with this install. The subs are low passed at 100hz@24db. It looks weird on paper but the midbass is high passed at 80@18db. Looks weird but that is what sounded the best. The midbass drivers are in normal phase and the subs are set at reverse phase. The ZR800 start to roll off around 200hz and the mids start to roll off around 400hz. I choose 315hz to cross them at. The mids/tweets are crossed an 3.15khz. Midbass/mids/tweets are normal phase. 

 

The green plot is the sub and midbass both set a normal phase.

The purple plot is the sub in reverse phase, midbass normal phase.

The blue plot is the sub in normal phase, midbass reverse phase.

 

 

The subsystem is blending into the front stage much much better now. I am very pleased! I have contacted chefhow, a multi MECA PA state champ, and he is willing to listen to my car and give me some pointers I am anxious to hear what he says!

 

 

 

 

 

Next things to do is to glue some carpet down in a few spots and replace my XS Power D3400, it isn't holding a good charge anymore (about 4 years old). I think I am replacing it with a Sears Diehard Platinum group 65.

 

 

 

Always open to suggestions/thoughts!!!

[Impious 1,476]

I readjusted the gains on my KS900.6. I used two 8 ohm non-inductive dummy loads wired together for 4 ohms, a hand held o-scope and DMM. I had previously set the gains with a DMM only. It turned out that the midbass channels on the KS900.6 was set at a whooping 20 watts :surprised:

Set it by ear, then check with measurements after if you feel the need.  The only time I ever pulled out a DMM to set my gains is level matching left & right

[edouble101 314]

I plan on re-tuning tomorrow with a slightly different approach.

 

New battery installed. Diehard Platinum group 65.

 

 

[ricksi30 923]

So....how do you like the sub setup? I'm thinking about two 15s or an 18" IB setup.

[azlnick 1]

So....how do you like the sub setup? I'm thinking about two 15s or an 18" IB setup.

If you do end up going that route, you should sell me one of your XCONs and your enclosure! 

[ricksi30 923]

So....how do you like the sub setup? I'm thinking about two 15s or an 18" IB setup.

If you do end up going that route, you should sell me one of your XCONs and your enclosure! 

They are gone....

[azlnick 1]

 

So....how do you like the sub setup? I'm thinking about two 15s or an 18" IB setup.

If you do end up going that route, you should sell me one of your XCONs and your enclosure! 

They are gone....

What?? Sold already? Stolen? I saw you punctured your dustcap, but that's about it.

[ricksi30 923]

Sold, It was time for something new.

[edouble101 314]

 

 

So....how do you like the sub setup? I'm thinking about two 15s or an 18" IB setup.

If you do end up going that route, you should sell me one of your XCONs and your enclosure! 

They are gone....

What?? Sold already? Stolen? I saw you punctured your dustcap, but that's about it.

 

 

 

 

So....how do you like the sub setup? I'm thinking about two 15s or an 18" IB setup.

If you do end up going that route, you should sell me one of your XCONs and your enclosure! 

They are gone....

What?? Sold already? Stolen? I saw you punctured your dustcap, but that's about it.

 

 I didn't puncture the dustcap. Expanding foam accidentally dripped on to the cone.

[ricksi30 923]

Haha he was talking about me man, I screwed up my dustcap.

[edouble101 314]

So....how do you like the sub setup? I'm thinking about two 15s or an 18" IB setup.

 

The setup : (2) IB315's powered by a SAZ1500D v.3 @1ohm. High passed at 20hz@24db, low passed at 56hz@18db. I could lower the high pass but i do not see a reason why. These subs are rated at ~500wrms@20hz and I am powering more than that (cautiously). Normal phase. 

 

Response : There is a big peak around 28hz. I do not have enough "cutting" to flatten it out. I think this is caused by having two high qts 15" subs in a small 13.5^3ft trunk. This isnt too big of an issue since most bass is above this. Also, this is not causing a "boomy" sound. They do have a usable response up to about 80hz. For staging reasons I found it sounded best to cross lower to help maintain the image of "up front bass". This illusion is pretty good on most tracks but the majority of songs the bass surrounds you versus strictly up-front.

 

Output : The IB315's have a decent amount of output on the SAZ1500D v.3. In fact the majority of the time they bass level is turned down considerably. These subwoofers will handle a lot of power with a SSF set at 20hz@24db. I hear no mechanical noise or audible distortion that would make me think they are stressed. I am anxious to get this setup on the meter. I am betting 140db @25-30hz.

 

Clarity : Bass is extremely clear and I am really enjoying the snappiness of these setup. There sounds to be no overhang of a bass note when another one starts. 

 

Overall judgement : Not having an enclosure is a huge bonus for me. The overall response of this setup is very good. Bass is so smooth (due to a somewhat flat response) sounding. I am not convinced that IB is the "go to" setup for SQ. I think that a properly designed sealed or ported enclosure  will give very similar results. I would like to try a lower qts subwoofer in this setup such as SI HT15's. I have a good idea that a lower qts subwoofer would yield a flatter response.

 

 

 

 

 

Note on RTA tuning : A flat graph sounds like shit. No sub bass, no midbass, lifeless midrange. I use an RTA to help me identify problem areas then I tune by ear. You will notice that my graph is not flat. There is an up-rise starting in the upper midbass region and gradually continues through the sub bass region. This is how a graph should look IMO.

 

Note the untameable 28hz peak.

 

[edouble101 314]

Haha he was talking about me man, I screwed up my dustcap.