Need help on Polk LSi25 cabinet mod - Page 2

soniky · 24th January 2013, 09:04 PM

Here's the pics of the speaker and external XO. I have no doubt of the XO mod, but maybe there is some inherent cabinet issue with the speaker?

Face · 25th January 2013, 06:57 AM

Can you experiment with speaker placement first?

You can also experiment with various amounts of denim insulation or polyfill in the top cabinet.

One last thing, experiment with your sub. A bottom end that's too hot can have a negative effect on the rest of the speaker.

soniky · 25th January 2013, 02:19 PM

Face... thanks for your reply.
I have Blackhole5 that I've prepared for this purpose. Is there some common sense practice of areas that I should try, or avoid, i.e. top, bottom, sides, back of the drivers, etc.? I've heard people say do it all around but I am not sure. I understand my placement could be an issue as well but there is not much flexibility besides changing toe in.

Inductor · 25th January 2013, 07:42 PM

Quote:

Originally Posted by soniky

It's a professional mod.

Call it DIY. Why professional?

soniky · 25th January 2013, 10:01 PM

Quote:

Originally Posted by Inductor

Call it DIY. Why professional?

We can call it DIY, but I paid for it.

soniky · 29th January 2013, 08:45 PM

I discovered that the lower driver is about 20db lower in volume than the upper driver. Does anyone know if this is typical in this 3way design?

I understand the upper driver is crossed from 80hz to 2.4khz and lower driver from 80hz to 800hz but I am surprised by such a volume difference. It doesn't seem to matter no matter what I play.

Face · 29th January 2013, 08:47 PM

What frequency did you measure this?

You realize it's a 3.5 way, not 3.

Sent from my DROID3 using Tapatalk 2

soniky · 09:30 PM

Well, I didn't do any measurements. I listened to the same music at -20db and then I unplugged all the other drivers except for the lower one and listened again. However, I found that I need to turn up the volume to 0db in order to be roughly as loud as the first time. I played a piano piece which covered all high to low ranges and then a particular pipe organ piece that's very low in freq. That's why I say roughly a 20db difference but it could be more based on my ear. I have a regular mic which I think I can use with a freq response analysis software for measurement if that's needed.

Forgot to ask, why it's a 3.5 way?

nrg2009 · 26th February 2013, 01:48 PM

great posts! I was thinking of getting these speakers.. It's hard to build speakers yourself that look this good (sound is another story)..

soniky · 26th February 2013, 10:39 PM

They surely look good. Sound good too but I just wanted more.

25th January 2013, 06:57 AM	#12
Face diyAudio Member Join Date: May 2007	Can you experiment with speaker placement first? You can also experiment with various amounts of denim insulation or polyfill in the top cabinet. One last thing, experiment with your sub. A bottom end that's too hot can have a negative effect on the rest of the speaker. __________________ "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche

29th January 2013, 08:47 PM	#17
Face diyAudio Member Join Date: May 2007	What frequency did you measure this? You realize it's a 3.5 way, not 3. Sent from my DROID3 using Tapatalk 2 __________________ "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche

29th January 2013, 09:28 PM	#18
soniky diyAudio Member Join Date: Jan 2013	Well, I didn't do any measurements. I listened to the same music at -20db and then I unplugged all the other drivers except for the lower one and listened again. However, I found that I need to turn up the volume to 0db in order to be roughly as loud as the first time. I played a piano piece which covered all high to low ranges and then a particular pipe organ piece that's very low in freq. That's why I say roughly a 20db difference but it could be more based on my ear. I have a regular mic which I think I can use with a freq response analysis software for measurement if that's needed. Forgot to ask, why it's a 3.5 way? Last edited by soniky; 29th January 2013 at 09:30 PM.

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25th January 2013, 02:19 PM	#13
soniky diyAudio Member Join Date: Jan 2013	Face... thanks for your reply. I have Blackhole5 that I've prepared for this purpose. Is there some common sense practice of areas that I should try, or avoid, i.e. top, bottom, sides, back of the drivers, etc.? I've heard people say do it all around but I am not sure. I understand my placement could be an issue as well but there is not much flexibility besides changing toe in.

29th January 2013, 08:45 PM	#16
soniky diyAudio Member Join Date: Jan 2013	I discovered that the lower driver is about 20db lower in volume than the upper driver. Does anyone know if this is typical in this 3way design? I understand the upper driver is crossed from 80hz to 2.4khz and lower driver from 80hz to 800hz but I am surprised by such a volume difference. It doesn't seem to matter no matter what I play.

26th February 2013, 01:48 PM	#19
nrg2009 diyAudio Member Join Date: Apr 2009 Location: Detroit, born and raised in the netherlands.	great posts! I was thinking of getting these speakers.. It's hard to build speakers yourself that look this good (sound is another story)..

26th February 2013, 10:39 PM	#20
soniky diyAudio Member Join Date: Jan 2013	They surely look good. Sound good too but I just wanted more.

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