[Bass is lacking.]

Unfortuanetly 18" Speakers won't fit in the cabinet with the other components (Horn, Tweeter, and Crossover). And Though I could get another cabinet for it if I was going to do that I'd rather just buy a powered sub and I do need something that does work with the cabinet. Unfortuanetly I don't have the money to do that right this minute. I can modify the port though. As I mentioned earlier my dad suggested it was the crossover. Do crossovers limit the low frequencies sent to the woofer? If so would replacing it allow lower frequencies through? We also thought it could be that the woofer might be underpowered, because the low sounds are audible but lack punch. Is 250 Watts not enough to get enough power to overpower the Klipsch SP-1s output? Or could that also be a crossover issue with the crossover not sending enough power to the woofer?

[Bass is lacking.]

They are exterior measurements, and there is no internal bracing. The wall is somewhere between 1/2 and 3/4 in. thickness. The port is 3" in diameter, assuming its completely circular (which I'm not so sure it is). Also the other two drivers take a large amount of space, espicially the horn, which is almost the entire length of the cabinet (maybe an inch or so). If anyone has the specifications on the Speakerlab Horn HD350p I can't find them anywhere and would like to know what they are. Thanks for the advice so far. I can return the woofers for several more days so please hurry if you have a better woofer recommendation. (Max Price=$380 or so each. Must handle at least 400 Watts long term and I would like it to have some serious punch if possible)

[Bass is lacking.]

And by the way, these speakers will see some use in DJing and other high-power activities so any other woofers would have to sustain at least 400 Watts Long Term. My dad thought it was a crossover issue, because they sound almost exactly the same as the Speakerlab woofer did. So maybe the Crossover is a high pass crossover and isn't sending all the low frequencies? I have an old pair of Bose Omnivector Model 2 speakers in my room that sound like they have more bass and only go down to 32 Hz.

[Bass is lacking.]

I was thinking of sealing off the top portion of the cabinet so that the bottom dimensions would be the same (and still ported) except only 20 in. high instead of 36.

[Bass is lacking.]

The cabinet is vented, it measures 36 in. high, 20 in. wide, and 24 in. long. The vent is circular and is three inches tall. There is no filling currently but it had insulation in it before. There are also two small slits just above and below the tweeter, probably 1/4 of an inch tall and and inch or so wide. I plan to fill these in (with wood). I'd put a picture but can't figure out how.

[Bass is lacking.]

So I have an old speaker my dad constructed (he built the cabinet) probably about 18 years ago, the components originally were a EV T350 Tweeter, a Speakerlab HD350p (I think, hard to read the letters) midrange horn, and a Speakerlab W1508s 15" woofer with a Speakerlab crossover (model # 141/79). The woofers were punctured so we replaced them with EVX-155s. The Specs on EVX-155 is below:

SPECIFICATIONS

Nominal Basket Diameter<?XML:NAMESPACE PREFIX = O />

15"

Impedance

8 ohms

Long Term Power Handling

600 Watts

Short Term Power Handling

1,200 Watts

Short Term Peak Power Handling

2,400 Watts

Frequency Response

30Hz - 1.8khz

Sensitivity (1W/1m)

98dB

Maximum SPL

122.8dB

Voice Coil Diameter

4" /102 mm

Voice Coil Winding Depth

.8" / 20.3 mm

Reference Efficiency

2.49%

BL Factor

20.4 N/A

Magnet Weight

7.7 lbs. / 3.2 kg.

Even though they should sound great they seem to lack the range that the specifications indicate they have, on the low end. When compared with the Klipsch SP-1s that we have (which also extend down to 30 Hz) they seem to seriously lack performance. I was wondering if anyone had any idea why? (by the way they were hooked up to a Yamaha M-45 Natural Stereo Power Amplifier (250 Watts X 4) or a Pioneer VSX-72TXV Audio/Video Multi-Channel Reciever (130 Watts X 7) when they were tested. The Klipsch SP-1 was hooked up to the Pioneer.