My AUDIOBAHN system is done

[Bassboy]

Well as promised, and many late nights..here is the system in my wifes p5! clean install, and very loud..

ITS ALL AUDIOBAHN:

Vruti's System Setup

Headunit:
Alpine 9805 Cd player

Front Stage:
1 set -Audiobahn AS62Q 6.5" midbass with removable tweeter ( tweeter mounted on door)

Rear Stage:
1 set - Audiobahn AS62Q 6.5" midbass with removable tweeter ( tweeter mounted on door)

Subs:
- 4 - 10" Audiobahn AW101T - Chrome Flame Series
- 2 - AeroPort Technology Ports

Amps:
2 - Audiobahn A4004T - Chrome Intake Series ( total power 800 watts ) 1 for the subs, 1 for the highs, nothing running off the deck.

Wiring:
3 sets - Audiobahn CP150 15 PRO GRADE RCA's ( blue/Silver twisted)

- Audiobahn A50.12S - Super Flow 50 ft. 12 Gauge Twisted blue/silver Speaker Wire

- Audiobahn A100.4C - Super Flow 4 Gauge Power Wire, 1862 Strands, Clear.

- Audiobahn A100.4B - Super Flow 4 Gauge Ground Wire, 1862 Strands, Black

Fuses/Fuse Blocks

- Audiobahn APG2448 Fuse Block ( 4 outputs - by amps)
- Audiobahn COANL ANL FUSE Holder ( by battery)

Security:
- Fusion F-3500 Security System with pager system enabled.

Full custom install & amp rack. We made it so it doesnt look like JUST A BOX in a trunk..had to make it look right!

Install was Peter Prabucki from Maximum Threshold ( www.maximumthreshold.com ) I am helping him with his webpage, there is a re-direct on his site to my testing area for now..but its all enabled as we build it.

/members/Bassboy/vrutis_p5_subs_amps.jpg

/members/Bassboy/vrutis_p5_subs.jpg

/members/Bassboy/vrutis_p5_door_component_far.jpg

/members/Bassboy/vrutis_p5_close_side_detail.jpg

/members/Bassboy/vrutis_p5_cd_player.jpg

 

[mypfizzle]

nice. -=)

 

[mp5jeff]

nice and clean, not overdone, good work, also did you get it on a meter yet?

 

[Bassboy]

no meter yet...not built for spl..it should only hit 145db prolly..it was built for reg. music and show ..im getting something made for the top of the box..like AUDIOBAHN cut out of plexi glass and lit up in blue neon..just a hint..the amps have blue leds in them..man are they bright..looks like a big computer in the hatch when looking through the window!

I will get my installer to do it soon,,they have a db drag meter there But thanks for the great feedback!

 

[Bassboy]

This summer were gonna invert the subs..cause the magnet is full chrome with flames..looks gorgeous inverted.!! take a look!


/members/Bassboy/10_flame_sub.jpg

 

[mp5jeff]

neat

 

[mp5jeff]

you should invert 2 and keep 2 regular...i like that look

 

[Bassboy]

yeah my installer said the same thing..i gotta make sure that it doesnt effect the sound quality too much.. the box volume will change cause the displacment of the sub is not there no more when 2 are inverted..

 

[Bassboy]

but its all up to my wife..she into this stereo hobby as much as me..so this is her car..im only paying for it all ..but her and I both bought the car..she picked out all the equipement and got my advise on things..

 

[Rider69]

So, I gather you are NOT sponsored by Audiobahn? Then why waste your money on having all of their equipment? Unless that is what you are going for. IF that is what floats our boat?

 

[got wake?]

yeah, it's pretty. the install is nice looking, but too flashy for me though. course audiobahn by itself is too flashy for me

 

[Bassboy]

people have mixed reviewed of audiobahn..personally i love its, it efficient, clean and loud...and yes it is flashy...which is good for showing at shows..i dont mind it at all..

i am sponsored partly by the shop...i got it all at cost..with my past history in the show scene with my current car ( 38-1st place trophies, 5-2nd place), they are assuming i will do amazing things with this car too..which i plan too..i just got this car 2 weeks ago.. but thanks anyways!!

 

[Padanky]

yeah my installer said the same thing..i gotta make sure that it doesnt effect the sound quality too much.. the box volume will change cause the displacment of the sub is not there no more when 2 are inverted..

It is alot louder, "ISOBARIC" I believe is the name for it. I had to Infinity 10"s along time ago, and it almost doubled the bass.

 

[got wake?]

It is alot louder, "ISOBARIC" I believe is the name for it. I had to Infinity 10"s along time ago, and it almost doubled the bass.

inverting the subs are no louder. there is no difference. isobaric is a configuration that uses 2 subs to do what one can do. it doesn't double the bass. basically you use 2 subs facing each other to work together to utilize a smaller enclosure. you can use 1/2 the enclosure size with the 2 subs to achieve the same results at one sub in twice the box size. but when you do it, you gain nothing, and you have to have twice the amp power to achieve it, since you have 2 subs.

Bassboy, inverting the subs will make a little difference, and change the tuning a bit, but you could always put blocks of wood or something in the box to make up for the displacement

 

[Bassboy]

yeah true...thanks for the block idea..hmmm

..and also isobraic setup is louder..and more effiecient..but the down side is limited bandwidth of frequency ..and major power handling loss below the very limited freqency range..i would never do isobaric setup..its not for me....

 

[Little Beavis]

Much better control in a piggyback (iso-port) or push-pull (iso-baric). . .better damping. . .less chance of bottoming out. I'm pretty much hooked on iso-port. Smaller box which is cool and great response where it is tuned, but as stated, outside that tuned area, they lose a bit.

Oh yeah, almost forgot. . .looks very nice!

 

[Bassboy]

here the REAL DEAL ON SUB BOXES

Enclosure Types and Comparisons

There are quite a lot of different enclosure types. The three most common are Sealed, Bass Reflex and Bandpass. In this paper, I will write a little about each of them and I will demonstrate some main differences between them. Group delay (which can be looked upon as how good transient response the speaker has or how "fast", "quick" etc it is) and frequency response is what we will mainly look at when comparing the different enclosure types.

Sealed Box

Bass Reflex Box

Single Reflex Bandpass Box



Short description of each type

Sealed Box

The sealed box is the simplest box of the three mentioned. It is simply a box with a driver in it. The air inside the box works as a suspension for the speaker. Depending on the size of the box different frequency responses can be achieved. With the differences in volume comes differences in cone excursion, and group-delay, as well as other things.

Benefits with sealed boxes are:

Easy to build (they are not so sensitive if the volume isn't precise)
Best (low) group-delay/transient response which means they are very tight if designed properly
They can take a lot of power throughout the entire frequency range
Drawbacks with sealed enclosures are:

Efficiency is relatively low
Frequency response can suffer in some cases in the lowest octaves/frequencies
Bass Reflex Box

The bass reflex box is a little more complicated than the sealed box. In addition to using a determined amount of air to reproduce frequencies, it uses a port that helps in reproducing the lowest frequencies. The port can be "tuned" to reproduce different frequency responses. Variables are port length and port area (i.e. diameter for a cylindrical port).

Depending on what frequency you want the port to be tuned to, the length will be given for a given area by using certain formulas. Since there are a few different theories to calculate port length for a given tuning frequency I will not give a formula here. Instead you can contact teamROCS Technical and they will help you out. A lot can be said about the bass reflex box, but let's go into pros and cons.

Benefits with bass reflex boxes are:

Extended frequency response
Higher efficiency
Higher power handling above the port tuning frequency
Drawbacks:

Harder to build and to get right
Lower power handling below the port tuning frequency
Worse group-delay/transient response than a sealed box (but better than bandpass) but still very acceptable if designed properly
Single Reflex Bandpass Box

The single reflex bandpass box is one kind of bandpass box. It has merely a port to reproduce all the bass frequencies. There are other types of bandpass boxes, but since they in most cases will affect sound quality negatively I will not mention them here. The single reflex bandpass is the bandpass that will affect the sound quality least negatively of all bandpass types.

Since all the sound will come from the port, it is obvious that the port needs to have free flow and that the sound is not distracted by any metal, fabric or other material. Furthermore, as you can see on the picture above, it has two chambers which makes it quite hard to build and get right. Depending on the volume of the chambers and the length and area of the port (tuning), different frequency responses can be achieved. The bandpass can be built to give a very high efficiency at a very narrow frequency range, or it can be designed to have low efficiency at a very wide frequency range. Something in between is common.

Bandpass boxes are in most cases only for the experienced people. If not constructed properly with correct chamber volumes and port variables, it will in 99% of the cases sound A LOT worse and A LOT lower (SPL-wise) than a simple sealed box. It is always a good idea to check with the manufacturer of the speaker for volumes and port lengths/areas if you decide to build a bandpass.

Benefits with bandpass are:

Can be built to have very high efficiency which makes it good for high SPL
Can be built to have great frequency extension
Drawbacks are:

Hard to build
Worse group-delay/transient response compared to the other boxes
Comparisons between the mentioned three speaker types

Below I will try to demonstrate the difference in frequency response between the different enclosure types. In the comparison, the same driver has been used for all three types. The simulation has been done by using LSPCad for Windows v3.00. I have made a comparison of "typical" frequency responses and I have set the volume of the enclosures to be the same. Power was set to 300 watts. The graphs show free-air simulated responses. In-car responses would be a whole different story, but since the car would affect the sound in the same way for all three enclosures it is neglected here.



As you can see the bandpass has the highest efficiency, but lacks some in extension. The ported enclosure has somewhat lower efficiency but improved bass extension. Compared to the sealed box it has about the same extension but higher efficiency. For this driver in a 1.5 cu ft enclosure, the ported enclosure might be the best alternative. However, it should be noted that the sizes are not necessarily the optimum and it should be noted that other factors such as group delay should be considered. For the above boxes, the following group-delay figures were calculated:

Sealed: 6 milli-seconds @ 38Hz
Bass reflex:10 milli-seconds @ 25Hz
Bandpass: 14 milli-seconds @ 50Hz

Some people feel that group-delay figures lower than 20 ms is acceptable and the least that can be noticed. If that is true, you would not be able to hear any difference in transient response between the above simulated speakers. However, other people say that 10ms is the limit. The best thing is to compare different boxes for yourself and determine what you like. Personally I have yet to hear a bandpass enclosure that sounds as good as a sealed enclosure.

 

[got wake?]

yeah true...thanks for the block idea..hmmm

..and also isobraic setup is louder..and more effiecient..but the down side is limited bandwidth of frequency ..and major power handling loss below the very limited freqency range..i would never do isobaric setup..its not for me....

an isobaric setup with 1/2 the enclosure volume, and twice the power of a regular setup with one sub, twice the air space, and half the power will net the same spl. isobaric boxes are very inefficient, being that you need more power to achieve the same results. the flip side is that it takes up less space. in the audiophile community, isobaric setups are not used. any enclosure type can be used as isobaric, whether it be camshell or another type, but if space is not an issue, isobaric is pointless. there are 2 reasons why you should use isobaric:
1: you've got too small of a space to use a regular size box
2: you've got more money than you know what to do with, so you can buy twice as many amps

 

[Bassboy]

I DONT KNOW EVEN HOW THIS STARTED..HA HA HA..im happy with ported box...hee hee

someone else mentioned they are using a different box

 

[1sty]

yeah true...thanks for the block idea..hmmm

..and also isobraic setup is louder..and more effiecient..but the down side is limited bandwidth of frequency ..and major power handling loss below the very limited freqency range..i would never do isobaric setup..its not for me....

Thats bandpass!

Iso baric, as you have to use atleast 2 subs and can only get the output of one is technical 3db less then even sealed. Hence it is the least effecient.
To regain the volume of using 2 subs in an isobaric box you must double the power the 2 would normaly get.