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Discussion Starter #1
I have finally have my room set up and woofers set in place running off a crown xls1502 at 4 ohm per channel .
I was expecting much more output then I have . The woofers barely move . They are housed in a 22.5" square cube each . With approx 5 lbs of stuffing in each sealed box . I've looked over everything many times and can't figure out why there is barely any movement/ split. Coming from them . Can anyone shine some light on this for me . ?
 

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Is the output sufficient? If so, I think you're in a good place; less movement = less distortion. So long as the output is OK then maybe it's not a problem.
 

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What Jman said. But if it really is an output problem and not just a lack of cone movement, then some details on your wiring / signal chain would be helpful. Common problems include something amiss in the amp’s menu, or Speakon connectors not wired correctly (if you’re using those).

Also, the speakers could be out of phase, meaning that the polarity is flopped on one of them. A good way to check for that is to disconnect one of the speakers. If you suddenly get sound, then that’s the problem.

Regards,
Wayne
 

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Output is quite low . Reciever is a onkyo nr807 i have a pair of rca cables going from there to the amp . Then from the crown to the subs I am using the binding posts. I've tried plying with sub placement .. corner loading etc and no luck . I assumed a woofer with such soft suspension would move quite easily expecially seeing 525 watts .. I have turned all volumes up on the amp and signal from onkyo to crown up all the way . I will see a clip signal on the crown on the status bars and still not happy with output .
 

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I suspect a polarity issue. Try disconnecting one speaker as I suggested and see if the output levels increase. If that gets you nothing, then the fact that you’re lighting the clip indicators tells me you have plenty of input signal from the receiver, which basically narrows the problem down to a bad amplifier. You could double-check that by connecting it to your receiver’s L/R pre-amp outputs and see how it does with your main channel speakers (be careful!).

Regards,
Wayne
 

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I've disconnected one side.. no change . I'll have to try them on my set of b and w 683s and see what it does
 

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It must be a wiring or signal problem if you aren't getting much output.

That being said, the SI HT 18 has a ton of Xmech. I find that my nu3000 clips (and my entire house is shaking) before much audible distortion or even see the woofer traveling all that far. That Crown won't likely be enough power to bottom out the SI very easily.
 

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Discussion Starter #9
As states the amp is seeing plenty of signal . I know I've been over the wiring and checked imp . I have a competition car audio background. I'll go through it again tomorrow and try free air the woofers. Think it's possible that there is too much stuffing?
 

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Seems like a lot of stuffing, but i don't think that's your issue. plus i've had many onkyos and never had the sub level above zero.
One sub itself could be wired wrong when built. Also those subs are very power hungry, and 525 rms for those, is pushing the bare minimum.

Try sub level zero, amp level midway, and run one sub bridged, that will double your power and should give you some idea if its an amp issue. Also as stated before, try the front L/R preouts and see what happens. Good luck, shouldn't be to hard to narrow down the problem.
 

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Discussion Starter #11
I have tried playing g with sub levels and bridging . The possibility of the voice tinsel leads being wired backwards on the binding posts is something g I haven't thought of but could be a possibility
 

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I ended up working a double yesterday. I will try and get down and play today after work ...
This room is a new build never had subs in it . But basically a square room . 24 x 24 x8 ft ceilings with carpet .I'll keep you all posted on what I do today after work
 

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Went downstairs to play a bit . Pulled one sub. Ran it free air . No change in movement . Ran one coil per woofer and even less movement . .wired back up both coils and back to where I was . Borrowed a friend's 300 watt plate Amp. Ran a woofer free air with it and in the box . Virtually no change from the plate Amp to the crown for output. So I have a friend that live out of town and is coming in on Saturday and bringing me his ht18 to try in my set up. Hope something comes of this . When the woofers plays outside the box it smells like a blown woofer . Buy the coils look like new . Fee years ago I had built up a fi bl motor to a 18. Ran it on a 300 watt plate Amp and it moved a lot of air . And had excursion unlike my ht18s .. so sitting still I guess in till Saturday when we test some more . Unless someone has more input or ideas .
Thanks
 

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Went downstairs to play a bit . Pulled one sub. Ran it free air . No change in movement . Ran one coil per woofer and even less movement .
Running one coil cuts the motor force in half. Hence the reduced cone movement.

.wired back up both coils and back to where I was . Borrowed a friend's 300 watt plate Amp. Ran a woofer free air with it and in the box . Virtually no change from the plate Amp to the crown for output. So I have a friend that live out of town and is coming in on Saturday and bringing me his ht18 to try in my set up. Hope something comes of this . When the woofers plays outside the box it smells like a blown woofer . Buy the coils look like new . Fee years ago I had built up a fi bl motor to a 18. Ran it on a 300 watt plate Amp and it moved a lot of air . And had excursion unlike my ht18s .. so sitting still I guess in till Saturday when we test some more . Unless someone has more input or ideas .
Thanks
If you are not keeping the pole vent open (AKA: putting the pole vent against the floor) you are suffocating the cooling system for the coil, hence the coil smell. I do NOT recommend repeating the latter.

Are you certain you do not have a high-pass filter enabled in your system? Other comments about the leads/spider leads/terminals/etc are erroneous since you have music out of both woofers even when you hook up one woofer at a time. The problem is not on our end because of your report of the latter. If you have a steep high pass filter set at 30 Hz or 40 Hz it explains the lack of output. When you built/tested the fi subwoofer that you custom built was it the same impedance and did you use the exact same player, receiver, and amplifier setup compared to your SI HT-18 setup?
 

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Discussion Starter #18
When I built the fi sub all the equiptment was the same minus the crown amp. But I had 30 minutes today in between my job so I went down stairs to think. My ignorance the other day got the best of me . I only check one coil on the woofers when I pulled the jumper out . I pulled woofer back out and check both coils this time and must have check bad coils on each sub. I have one working coil per woofer . But they all read out fine which is weird. .. I do block the woofers off the ground so the poll piece can breathe.. so much for being new woofers I bought that the guy was advertising . Does anyone know if nick sells recones still for the ht 18s ? Glad I found the issue but bumbed out same time ..
 

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When I built the fi sub all the equiptment was the same minus the crown amp. But I had 30 minutes today in between my job so I went down stairs to think. My ignorance the other day got the best of me . I only check one coil on the woofers when I pulled the jumper out . I pulled woofer back out and check both coils this time and must have check bad coils on each sub. I have one working coil per woofer . But they all read out fine which is weird. .. I do block the woofers off the ground so the poll piece can breathe.. so much for being new woofers I bought that the guy was advertising . Does anyone know if nick sells recones still for the ht 18s ? Glad I found the issue but bumbed out same time ..
I do.
 
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