Re: 2001 Accord EX Sedan - it's long
Data was taken by using the SoundDevices USBPre line level rca input from the Alpine CDA-9887 output directly. Levels are relative. Autosound 2000 Track 18 (un-correlated pink noise) was used as the source.
I am using the Alpine DRE-A200 as a crossover between my tweets and mids off the Front outputs on the 9887. you can see the 12dB/oct slope of that crossover.
There is the same consistent drop at the crossover frequency (6 and 12 are the same, 18 and 24 are the same at the xover point). Certainly, when choosing crossover slopes and points, the drop at the crossover point should be taken into consideration - resulting in some overlap with the crossover points.
4kHz crossover point, slope varies 6 to 24dB/oct. Front output of 9887
http://i38.photobucket.com/albums/e1...7_4kHz_HPF.jpg
1kHz crossover point, slope varies 6 to 24dB/oct. Front output of 9887
http://i38.photobucket.com/albums/e1...7_1kHz_HPF.jpg
200Hz crossover point, slope varies 6 to 24dB/oct. Rear output of 9887
http://i38.photobucket.com/albums/e1..._200Hz_HPF.jpg
50Hz HPF, 250Hz LPF, slope varies from Full to 6, 12, 18 & 24dB/oct. Rear output of 9887
http://i38.photobucket.com/albums/e1...50Hz_BPF-1.jpg
Then i played with the mic for a bit. Played with crossover settings. I had the laptop in the passenger seat, mic at my head (moving around to average out peaks/valleys). This is the front stage only (no sub). Crossover points are:
Midbass: no HPF (Full), 315Hz LPF 18dB/oct
Mid: 250Hz HPF 18dB/oct, 3.5kHz LPF 12dB/oct
Tweet: 3.5kHz HPF 12dB/oct
One line is measured 1/24th oct, the other line is a smoothed version of that line.
http://i38.photobucket.com/albums/e1...ontstage-1.jpg
naturally, with the subs the low end is (much) higher, but I wasn't running the sub during the RTA testing today and was more interested in midbass response.
here are individual graphs of crossover slopes. This is what i've been listening to, set by ear. It is close to what I expected, though i'm more then 3dB down at the xover points.
http://i38.photobucket.com/albums/e1...12/3wayRTA.jpg
Re: 2001 Accord EX Sedan - it's long
yesterday i decided to dress up the door woofers by putting some vinyl around them. started by taking a cutting wheel on a dremel and improving on the cuts i made previously.
http://i38.photobucket.com/albums/e1...ps511f998a.jpg
did the passenger side, wasn't happy with the vinyl. did the driver side, added foam behind the vinyl to flush up with the door panel. still wasn't happy. it was better, but not what i really wanted.
http://i38.photobucket.com/albums/e1...psa27dea52.jpg
http://i38.photobucket.com/albums/e1...ps952fff57.jpg
http://i38.photobucket.com/albums/e1...ps82bcfab5.jpg
you can see that while the foam keeps the vinyl tight, it also bulges.
http://i38.photobucket.com/albums/e1...ps1ddf4250.jpg
Re: 2001 Accord EX Sedan - it's long
so around midnight i decided to take a 10" woofer grill and make a new door panel grill.
i've had this idea in my head for a long time, but i figured i would need a 12" grill in order to cover the way i wanted. turns out, a 10" grill was just perfect if i covered it.
i began by cutting and bending, test fitting, cutting and bending some more, test fitting some more, etc.
http://i38.photobucket.com/albums/e1...ps47314649.jpg
you can see that the door panels were cut in order to make room for the lowered/deeper woofers
http://i38.photobucket.com/albums/e1...psa3368e1b.jpg
so i wanted the grill to come behind the pocket, but then follow the contour of the factory opening. the front corner would not be covered due to the smaller grill size.
http://i38.photobucket.com/albums/e1...psef7a42e8.jpg
i was going to use grill cloth, but that would be too thin and show the edges and frame of the grill. a round hole expanded metal grill could be done to look nice and more polished (in the future maybe). i decided to use open weave carpet. having the color different is fine, i have silver accents in the interior.
http://i38.photobucket.com/albums/e1...ps0ae8b1ab.jpg
i trimmed some more, fitted some more, and got the grills to secure to the door panel. then i used trusty aluminum foil tape to secure the carpet. both have some of the rubber grill edging where it would contact the vinyl.
http://i38.photobucket.com/albums/e1...psc00ed07e.jpg
the result was pretty much what i wanted to achieve (at 2am)
http://i38.photobucket.com/albums/e1...psf179b522.jpg
http://i38.photobucket.com/albums/e1...ps82653056.jpg
Re: 2001 Accord EX Sedan - it's long
Re: 2001 Accord EX Sedan - it's long
is there any drivers in the floor anymore?
Re: 2001 Accord EX Sedan - it's long
Quote:
Originally Posted by
pickup1 
is there any drivers in the floor anymore?
the Dayton RS100 are in the side kick location. the Massive CK6 woofers are still in the floor, but not being used. That location is just too small for good midbass. I may rebuild those kicks to change midrange aiming. But for now, everything is as I want it to be. You'd never know the mids were on in the kicks. Everything is above the dash.
Re: 2001 Accord EX Sedan - it's long
This build log never ceases to amaze me, unfortunately I have trouble reading the above graphs did you see a flatter response after installing the fiberglass bat?
Re: 2001 Accord EX Sedan - it's long
Quote:
Originally Posted by
itsblown This build log never ceases to amaze me, unfortunately I have trouble reading the above graphs did you see a flatter response after installing the fiberglass bat?
Adding fiberglass smoothed high frequency response and allowed lower frequency response. I don't have great graphs of that, I hastily finished the batt install but didn't take the measurements I wanted to show before and after. Doh!
BUt when I compare older measurements with new, these are clear.
Re: 2001 Accord EX Sedan - it's long
Quote:
Originally Posted by
keep_hope_alive Adding fiberglass smoothed high frequency response and allowed lower frequency response. I don't have great graphs of that, I hastily finished the batt install but didn't take the measurements I wanted to show before and after. Doh!
BUt when I compare older measurements with new, these are clear.
Ohh alright I ask because I'm in the process of dealing up a friends trailblazer doors. Did you notice a decrease in road noise?
Re: 2001 Accord EX Sedan - it's long
no, adding fiberglass won't cut down on road noise too much - it will absorb sound inside the door cavity if you have the door well deadened and sealed - which is a good thing.
Re: 2001 Accord EX Sedan - it's long
Hey there.
I have a 98 Accord (Sedan) that I have put extensive work into audio wise.
Couple of thoughts to consider:
I'd recommend ditching the doors in favor of floor mounted (facing up) mids (8"). I'm using the infamous JBL 2118h's that way. There are several DIYMA members showing examples (I'll take pics later).
Also, have you considered mini-horns? The Accord dash is fantastic for mounting them and you can score HLCD's and old ID horn bodies on the cheap. Two-way in this small a car works well.
Digging your IB setup in the trunk. Very creative. I'm subless at the moment. Do you find the volume a bit on the boomy side or is it more SQ based?
Have you considered a car computer? I've replaced a metric ton of gear with a single "carputer". It an e5200 cpu with 4GB of memory, 80GB of SSD storage, all running in a single custom "amp like" enclosure mounted in the left side of the trunk much like your Xtants. I use an M-Audio Delta 1010LT PCI sound card plus AudioMulch to run it all. Independent EQ's, xovers, time delay, even level controls all in the digital domain and NO extra hardware. Truly amazing what technology replaces.
Whole thing is controlled by a custom 7" touchscreen in the dash with an 1100 nit capacative display.
I'll take some pics as you have some elements I've used and some I think you'd do well by (especially since we basically have the same car).
Re: 2001 Accord EX Sedan - it's long
Quote:
Originally Posted by
freudie1 Hey there.
thanks!
you may notice in earlier pictures that I have a spot for a 6.5" in the floor in addition to the 4" in the kick. I ran that for a while. I went back to the doors for several reasons.
i have considered horns, and I have no issue designing/fabricating custom horn bodies - but cutting the dash is something i am not going to do at this point and time. i almost had the dash out, but realized then that i would re-design the A/C ductwork to incorporate more customization and halted that effort. the spheres sound beautiful.
the IB wall is pure SQ. it is accurate, not boomy in the least. it sounds really nice.
i constantly consider a car PC. i've looked at a Raspberry Pi combined with a MiniDSP. I've looked at other options as well. As an EE, the idea is fairly easy to implement. Maybe next year. I am interested in what touch-screen you are using. That is the key component that I haven't found yet. The cost of SSD is becoming very attractive now.
Certainly, start a build log in the forum and post the link in this thread. I love to see other projects! But keep your build separate so everyone can comment on it without confusion.
Re: 2001 Accord EX Sedan - it's long
mad props sir...
I wish we were closer together so I could take a listen... I love SQ builds
Re: 2001 Accord EX Sedan - it's long
some recent measurements running a 2-way front. turned off the RS100 mids and ran the Silver Flute's up to 4kHz.
http://i38.photobucket.com/albums/e1...ults120412.png
has a smooth slope, which i like. i still have decent high frequency hearing. this is without any EQ.
top two lines are Lz max for a few Beastie Boys tracks. overall level (un-weighted) was around 130 dB - the top end of my listening volume.
bottom 3 are pink noise with and without subs. i also have two volume levels so linearity is evident.
Re: 2001 Accord EX Sedan - it's long
finally got to use my circle jigs. i've had these things for 3 years. i've had a few routers, but nothing that i wanted to use with the jigs. finally found a BNIB plunge on a CL ad, $35 couldn't pass it up. worked like a charm using a 1/4" straight bit.
http://i38.photobucket.com/albums/e1...-18-29_501.jpg
http://i38.photobucket.com/albums/e1...-21-12_122.jpg
the wood is 1" thick with 1/4" MDF on both sides and 1/2" ply in the middle. i had some laying around and the dimensions were just larger than what i needed anyway.
http://i38.photobucket.com/albums/e1...-31-06_266.jpg
i am firing forward this time so i can review the sub more accurately.
http://i38.photobucket.com/albums/e1...-17-37_118.jpg
i am leaving the speaker wire for the other configuration in place for now.
http://i38.photobucket.com/albums/e1...-18-03_877.jpg
http://i38.photobucket.com/albums/e1...3-19-53_31.jpg
i have the Ultra Subs A-12 to write a review of it. It ran in my Home Theater for a month, getting decent exercise. Now I have some windshield time ahead of me, so i'll see how it does in the IB wall.
