Question 1

In an infinite  baffle  replacement install in a Lexus sc430 what is recommended to obtain the best sound quality without building a box?

Accepted Answer

To be honest I never build a sub system without a box.  I tried this in a Lincoln town car designed for a free air 8". The results were okay but lacked control and easily got distorted.  I placed it in a box and got better results.  I am surprised at how well this sub performs for the price.  My advice though is to save your money and invest in a better sub or one rated/designed to go free air or infinite baffle.  By the way use the specs sheet to design the box.

Question 2

Why does it have to sides to connect to?

Accepted Answer

Its basically 2 speakers in 1, it's done mainly for more wiring options, you can wire left channel on 1, and right on the other, or wired together in different combinations to raise or lower the ohms to match your amplifier/system, there used in home and mobile audio systems, as long as the onms are a safe match, to low or high can burn up your amplifier or make hour music sound crappy, at the same time if the ohms are setup right, you can draw the maximum wattage from your amp safely although sound quality may not be as good at that level it's a trade off, 2ohm to 4ohm as example, 2 louder 4 quality.

Question 3

how many watts?

Accepted Answer

It will run cleanly off of just 50 watts. This is a fairly sensitive sub and doesn't need a bunch of power. 100w of rms power will drive this thing about as far as you want ro take it. I run one in a .6 ft sealed enclosure in my 16 yr old sons 2002 civic, it has a surprising amount of outpit but matches very nicely to a well treated door containing 6.5" midwoofers and tweeters.I also have one in a 2001 suburban in the factory subwoofer enclosure. Again, it is very surprising to see people react to the sound a "cheap" subwoofer produces.

Question 4

can this run 2ohm in parallel? is there a version of this with dual 4ohm coils? I need 2ohm version of this for Lexus SC430 (aftermarket 2ohm sub amp)

Accepted Answer

No. Dual 8 ohm coils can only give a 4 ohm load in parallel for a single woofer. It is a fairly high sensitivity rating though, so if you could find specs for your old woofer, if the Dayton was 3db higher...then it would be comparable to your old woofer at 2 ohm.

ASIN	B0045UY7M8
Additional Features	Bass Boost
Antenna Location	construction
Audio Driver Size	8 inches
Audio Driver Type	Dynamic Driver
Audio Output Mode	Surround
Best Sellers Rank	#56,270 in Electronics ( See Top 100 in Electronics ) #186 in Car Component Subwoofers #904 in Home Audio Speakers
Brand	Dayton Audio
Built-In Media	1 x Speaker
Color	Black
Compatible Devices	Desktop, Television, Projector
Compatible with Vehicle Type	Car
Connectivity Protocol	RCA, Speaker Wire
Connectivity Technology	RCA or Speaker Wire
Control Method	Remote
Customer Package Type	Standard Packaging
Customer Reviews	4.0 4.0 out of 5 stars (98)
Impedance	8 ohm
Is Waterproof	FALSE
Manufacturer	Dayton Audio
Model Name	SD215A-88
Model Number	PS-SWF-D01
Mounting Type	Flush Mount
Number Of Circuits	2
Number of Audio Channels	3.1
Number of Items	2
Power Source	Corded Electric
Speaker Maximum Output Power	160 watts
Speaker Size	8 inches
Speaker Type	Subwoofer
Specific Uses For Product	construction
Subwoofer Connectivity Technology	Wired
Subwoofer Diameter	8 inches
UPC	844632088698
Unit Count	1 Count
Warranty Type	Limited
Water Resistance Level	Waterproof
Wireless Technology	Bluetooth
Woofer Diameter	8 inches

SD215A-88 8" DVC Subwoofer

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