May 31, 2007This is from a write up I am putting together so it is really long and wordy but it was easier to copy and paste than write something new. There are lots of pics however if you get bored reading it.
This is the most recent build project for my 2003 Ram QC. It is a completely active (no passive crossovers) 4-way system mainly using home audio drivers. It is a simple SQ set up so there will not be any screens and it does not use any rear fill. Installation is the most important aspect of any car audio project and that will be detailed later on. Up first however is the list of equipment being used for this build.
Head unit: Alpine CDA-985 with the SIR-ALP
Processor: PPI DCX-730
Tweeters: LPG 25NFA
Midrange: SEAS Nextel W15LY001
Midbass: Peerless XLS 830491
Amplifiers: Two Eclipse XA4000 and a RE 35.1d
Reproducing accurate sound in a vehicle is far more difficult than in a home considering the seating position, reflections from the various surfaces, limited choice of mounting locations and inherent noise problems. To overcome these hurdles and to run a fully active system, a quality flexible processor is a must.
The processor I am using is the PPI DCX-730. This unit has three fully bandpassed outputs with individual gain controls on each of the six channels. Instead of one EQ, this unit has six separate parametric EQs, one per channel. This allows you to adjust the EQ on each driver individually. In addition it has:
- All three channels are bandpassed and fully adjustable in 1hz increments from 20hz to 20khz
- Selectable crossover slopes 6, 12, 18, 24 as well as selectable filters (Butterworth ***or*** Linkwitz-Riley)
- Time alignment on each channel
- Separate gain on each channel
- Separate volume on each channel
- Q variable 0.1-9.0
The head unit is an Alpine CDA-9835 which is probably my favorite offering from Alpine. I bought my first Alpine cassette deck in 1982 and have been hooked ever since. It has outstanding processing capabilities however those will not be needed since I am using the PPI DCX-730. Attached to the CDA-9835 via the Ai-Net will be the SIR-ALP1.
Now that the CD transport and processing equipment has been selected, we will move to the individual transducers. For this build I am going with home audio speakers in a three-way front stage plus subwoofer. After trying numerous high-end component sets by manufacturers such as MB Quart, Focal, JL, Infinity and CDT, IÃ¯Â¿Â½ve decided to go back to home audio drivers from various international manufacturers.
From the group of tweeters below I decided to go with the 25NFA from Lautsprecher Produktions-Gesellschaft mbH (LPG) in Germany. These are a 25mm Silk Dome Neo Shielded driver with great off-axis response.
For midrange I am going to go with Norwegian loudspeaker manufacturer, SEAS, who has been producing some of the best home audio drivers for the past 55 years. This particular driver is the SEAS W15LY001 Nextel coated paper cone midrange.
The midbass drivers are a set of XLS 8 manufactured by Peerless Audio of Denmark. Of all of the 8Ã¯Â¿Â½ decidicated midbass drivers I have tried, these lead the way in output and tonality. Unfortunatley, these are no longer made and this is one of the last sets produced.
For subwoofers I am probably going to go with two of the limited production TC10 from TC Sounds. TC Sounds is a San Diego based manufacturer of subwoofers such as the Rockford Fosgate TRF series, Eclipse Ti, the legendary Audiomobile MASS, SoundSplinter RL-p and RL-s, and many others. Last year they began selling to the general public and have some outstanding offerings. With a 0.3 to 0.6 ft^3 sealed enclosure requirement, these are outstanding small box drivers.