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Performance Evaluations

Before I begin testing any woofer, I put it through a break-in or exercise period. I usually apply a 20Hz sine wave signal to the woofer at a level of about 25% of rated power, for a period of about 4 hours, with the woofer in a free air state. This process allows the mechanical elements of the drivers _MG_8551_optsuspension to loosen up and normalize. After break-in, the woofer is allowed to cool for at least 4 hours before doing any further testing. In the case of the Stealth 13, I let it sit overnight, and then made all of the small signal parameter measurements first thing the following morning. As the owners manual made very clear, the specifications make the woofer ideally suited to sealed enclosures only… don’t even bother trying to come up with a vented design. Yes, port heads… I’m talking to you! Don’t do it!

Once those were completed, I mounted it in the optimum recommended enclosure, a 0.75 cubic foot sealed box, and took it into my listening room. With the woofer connected to my reference system, and the low pass crossover adjusted to about 80Hz, I began to evaluate the sound and power handling of the Stealth 13. Because I have tested quite a few of these shallow designs, and because of the very reasonable price of the Soundstream woofer, I had relatively low expectations. I have become used to accepting some performance tradeoffs for the convenience of a shallow woofer, but the Stealth 13 has raised the bar for what I expect from a moderately priced shallow woofer. As usual, I ran the gamut of musical genres during the evaluation, and the Stealth 13 couldn’t have cared less whether I played Bach or ZZ Top. The sound from the woofer was much better than I was expecting, with pretty decent low extension and nice warm “round” sounding bass. Definition and clarity were good as well, plucked strings and acoustic bass were well reproduced and sounded quite natural, with only a tiny bit of ringing or boominess, which many people seem to prefer anyway. As is always the case, lower F3 and improved damping can be had with a larger enclosure, but you trade off output and power handling, which is never a good thing in a car. I’d trust the Soundstream recommendations on this one, unless you are very experienced with custom enclosure design. To test the woofers ability to handle power mechanically, I deliberately picked a couple of fairly abusive “Bass Mekanik” tracks, and applied well over the rated 200 watts of power. Not until I got to over 400 watts did the woofer even show any sign of stress, so if you use it as rated, it should be as reliable as a stone.

One of the best ways of summing up the performance of this woofer was a comment from a friend who happened to drop in during my listening. He said, “Wow, that’s pretty impressive bass from a single woofer in such a small box.” Even more impressive… at the time, he had no idea the woofer was only 2” deep, and thought it was a conventional design.


On the bench the Soundstream Stealth 13 measured about the way it sounded… which was quite good! The graphs of the performance measurements and electro mechanical parameters are listed below. My measurements were quite close to the published specs, which is another good indication of a properly developed product.

01 SPL vs Freq_opt IMG_0651_opt 02 Impedance vs Freq_opt




If you have an application for a very shallow woofer and a relatively small enclosure limitation, you’d be seriously amiss not to have a close look at this woofer. Yes, there are better performing woofers, for either more money, or for larger boxes, but there aren’t very many that will outperform the Stealth 13 for the same money in a small sealed box. I’d love to hear a pair of these in a standard cab pickup… Boom Yeah!


Electro Mechanical Parameters

LMS – Loudspeaker Measurement System

Method= Double Curve - Delta Mass

Revc = 3.600 Ohm

Fo = 32.043 Hz

Sd = 80.470 In²

Vas = 1.446 Ft³

Cms = 106.974u M/N

Mmd = 223.814 g

Mms = 230.616m Kg

BL = 10.552 T·M

Qms = 3.030

Qes = 1.501

Qts = 1.004

Levc = 539.078u H

No = 0.087 %

SPLo = 81.402 dB

EPB = 21.34