Borisravel Posted January 13, 2017 Share Posted January 13, 2017 Hi ! I picked up this used subwoofer. It appears the blowhole (not sure it's the right word) has been extended with a cardboard tube by the precedent owner. Do you have some pictures from this stock sub ? Thank you. Quote Link to comment Share on other sites More sharing options...
JEFKlipsch Posted January 13, 2017 Share Posted January 13, 2017 Don't have any pictures, but, a stock KSW-15 has a cardboard tube approx. 6-8" long glued to the plastic port piece Quote Link to comment Share on other sites More sharing options...
babadono Posted January 13, 2017 Share Posted January 13, 2017 blowhole? now that there is funny That is called a port. Bass reflex enclosures have "ports". The size and length are important(that's what she said). Don't know this model but I'm thinking that is straight from the factory. 1 Quote Link to comment Share on other sites More sharing options...
Borisravel Posted January 13, 2017 Author Share Posted January 13, 2017 Yes, port, like guitars... I know I knew it... Ok, it could be this length. I Will post pictures tomorrow. Thank you ! Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted January 13, 2017 Share Posted January 13, 2017 It's probably the stock blow hole that the glue has worked it's way loose and has vibrated out of the blow hole enclosure. Just take the driver or amp out to repair the blow holectomy. Use PL Premium or similar to reattach from the inside. 1 Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted January 13, 2017 Share Posted January 13, 2017 Don't listen to the other guys especially that babosomethingorother. He couldn't find his own blow hole if you tied his hands behind his back. Quote Link to comment Share on other sites More sharing options...
The History Kid Posted January 13, 2017 Share Posted January 13, 2017 I have a KSW-15, I could get a few pics of it later. It sounds like the port is extended out? If so that's not stock, it should be flush with the cabinet. Quote Link to comment Share on other sites More sharing options...
JEFKlipsch Posted January 13, 2017 Share Posted January 13, 2017 Ibiza...I "think" he's referring to the cardboard tube that extends inside the enclosure that is glued to the plastic port. I know on both of the KSW-15's I've had that I had to re-glue that tube back onto the port at some point Quote Link to comment Share on other sites More sharing options...
The History Kid Posted January 13, 2017 Share Posted January 13, 2017 Ah. Makes sense. I had to reglue mine too. Quote Link to comment Share on other sites More sharing options...
Borisravel Posted January 14, 2017 Author Share Posted January 14, 2017 Just one thing, I'm French, and technical words are rarely right in a translator... Ok, here is a pic. Now, there's another problem. In my room, a normal listening volume is reached with the preamp knob at 8 o'clock. At this position, there is not enough power in the sub out. At maximum sum amp volume, I can hardly listen to the subwoofer. Likewise, there is not power enough to use the auto power. I found this solution: to use a XLR -20db attenuator. But I don't know this accessory, isn't bad for sound quality ? Quote Link to comment Share on other sites More sharing options...
The History Kid Posted January 14, 2017 Share Posted January 14, 2017 That port looks stock. As for the volume, you may have a bad board. What levels are set on the amp? Quote Link to comment Share on other sites More sharing options...
Borisravel Posted January 14, 2017 Author Share Posted January 14, 2017 The gain on my power amps is fixed. Sub works well above 10 O'Clock on the preamp knob. But at 10 O'Clock, with the LS, It's not possible to stay on the room and certainly in my house. Quote Link to comment Share on other sites More sharing options...
The History Kid Posted January 14, 2017 Share Posted January 14, 2017 Do you have the sub crossed appropriately? What gain is the sub set at? Quote Link to comment Share on other sites More sharing options...
Borisravel Posted January 15, 2017 Author Share Posted January 15, 2017 I use the line in (my preamp has L+R sub out). Gain is set at max on sub. The problem comes from the difference of sensitivity between LS and Sub. Cut frequency is set at 75hz ( low C1 at 65hz is the last note I can correctly hear on LS ). Quote Link to comment Share on other sites More sharing options...
The History Kid Posted January 15, 2017 Share Posted January 15, 2017 So you have the high cut set at 75 Hz and the gain maxed on the sub...and you say it's either too quiet or too loud - never just right...so there's an immediate spike in how loud the sub is, correct? Do you have another amplifier you could test that sub on? Quote Link to comment Share on other sites More sharing options...
Borisravel Posted January 15, 2017 Author Share Posted January 15, 2017 I have LS speakers and 2 mono 200w power amp. With these speakers, I can't go above of 9 o'clock with the preamp volume knob. But at this position, subwoofer is too quiet. If I switch off my 2 power amps, and go to 10 or 11 o'clok with the preamp, the sub works perfectly, but at this volume, I'll become deaf immediatly. So, the solution I've found is to reduce the signal between the preamp and the power amps, in this way, I'll be able to go up above 11 o'clock with the LS. Quote Link to comment Share on other sites More sharing options...
mustangdaren Posted February 7, 2017 Share Posted February 7, 2017 I would probably just try a rca style male Y adapter to two female RCA outs, and send the same signal to both the sub and the amplifier from your preamp. You would lose the pre-amp's built in crossover but it is not really needed since you can control the crossover frequency at the subwoofer. This is what I do for my audio system since my vintage preamp does not have a subwoofer out and it works great. I probably have my subwoofer gain set to about 9 o-clock and can easy drive it to full output while keeping it balanced with my main speakers. Quote Link to comment Share on other sites More sharing options...
Borisravel Posted February 8, 2017 Author Share Posted February 8, 2017 Hi ! I've bought 2 XLR -20DB attenuators. It's a fantastic tool. Now, I can set up volume knob at 10 o clok or even eleven. Now, I can use the sub with half volume so I can increase it if necessary. It's a very usefull tool for who has some high db speakers. Quote Link to comment Share on other sites More sharing options...
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