Converting LSi15 to LSi9

[SlowcarIX]

I am thinking about it because the M/T/M array on the

LSi15 goes from 150Hz to 27KHz (leaving the side firing woofer out) and the

LSi9 from 38Hz to 27KHz...i want a wider range from the LSi15 mtm array

there is quite a bit of info below 150Hz thats too far from the ears
http://en.wikipedia.org/wiki/Vocal_range

any down side to this conversion?

has anyone done this mod b4 and can i buy the LSi9 xover from polk?

[ben62670]

While not an exact to spec mod you could take a double pole double throw switch, and have it both ways. There is a 130uf cap that blocks the bass from reaching the upper drivers, and the sub could be disconected. I don't know how handy you are DIY, but a switch wouldn't be to hard to do, and you would not detract from the performance in "LSI15 mode".

[ohskigod]

i"m spitballing here, but are you actually hearing an issue with the response below 150, or just uncomfortable with the fact that 150 and below comes out the side woofer?

if your hearing something off on your bottom end, make sure your giving the 15's room to breath out the side and play with placement. effing with the crossover is just not worth it in my eyes.

even if you make the top part into an LSi9, its a different internal volume, which is gonna throw sh*t off anyway.

[dorokusai]

There is far more unheard information in the upper register, for most people, than the lower.

Yes, you may purchase the xover from Polk, but why? Have you found a new way to design a loudspeaker, based on a single event?

[SlowcarIX]

perfect

will call polk in the morning and get a pair of LSi9 xover and make myself a pair of LSi12

[ben62670]

Have you looked at the cutaway of the 9's. I don't think the 15's, and the 9's would share the same XO cutout. Have you looked at the schematics yet. I wouldn't be too quick to tear them apart without a little more thought.

[cfrizz]

FrankenPolk LSI's????? Oh the horror

[tonyb]

Why not just sell the 15's and get the 9's with a good sub?

[SlowcarIX]

FrankenPolk LSI's????? Oh the horror

;):):p:D

[Face]

Why not just sell the 15's and get the 9's with a good sub?

I agree, just sell them and buy the correct items for your needs.

[engtaz]

I heard that Bose work good in the sound spectrum.

engtaz

[SlowcarIX]

Why not just sell the 15's and get the 9's with a good sub?

LSi9 + 28" speaker stand + 1 bengal cat = broken LSi9

so besides wanting to extend the lower range of the MTM array, i want those speakers to last more than a day :)

~30lbs speaker falling over 2ft...it will be messy

[venomclan]

i"m spitballing here, but are you actually hearing an issue with the response below 150, or just uncomfortable with the fact that 150 and below comes out the side woofer?

if your hearing something off on your bottom end, make sure your giving the 15's room to breath out the side and play with placement. effing with the crossover is just not worth it in my eyes.

even if you make the top part into an LSi9, its a different internal volume, which is gonna throw sh*t off anyway.

I agree, I would make changes elsewhere before tearing open and possibly messing up the Lsi15's. I presume you are talking about mainly 2 channel performance, try moving the speaker closer to you and toeing them in a little. It looks like you are sitting back a bit and the first reflection points of your right speaker can be hitting your front door alcove without toe in. The stacked subs are also interfering with your soundstage. Also pull the 15's out from the back wall and into the room more, it will not look as nice but should improve the sound substantially.

It looks like you have a wide glass-topped coffee table in front of the couch, if you are that critical of the sound that you are going to change your crossovers, I would nix the table first.

Through my research and speaking with industry pros here and there, it is of the opinion that Ice power amps do not perform as well with ohm dips. Being that the 15's are 4 ohm, this may be a challenge at the lower register.

Every amp is different, some amps are "restricted" when plugged into a power conditiner. Try changing from the high voltage outlet to one of the digital banks on the PF60 and see if you hear a difference. Also try bypassing the PF60 altogether for the amps. I have the PF60 also and like it a lot, but at the end of the day, plugging a high end amp and AVR into a $200 conditioner may not have all its potential. Good luck.
Venom

[mightymouse]

What kind of speaker stands were those?

I just purchased a pair of Target MR28 speaker stands. I hope those wont be bumped over by a cat. :)

LSi9 + 28" speaker stand + 1 bengal cat = broken LSi9

so besides wanting to extend the lower range of the MTM array, i want those speakers to last more than a day :)

~30lbs speaker falling over 2ft...it will be messy

[SlowcarIX]

Polk CS gets 10/10!

the downside to this conversion = port noise

the LSi15 does not have rear port like the LSi9 and all the breathing will be thru the 2 little front ports...low frequency = large cone movement = lot of air moved = annoying port noise. So thats that for this project :o

[SlowcarIX]

What kind of speaker stands were those?

I just purchased a pair of Target MR28 speaker stands. I hope those wont be bumped over by a cat. :)

i got the 28" by measuring from the ground to the MTM section on the LSi15

for my case, the cat jumping from the ground to the top of the LSi15 is not the problem...its the leaping from the LSi15 to the top of the tv shelf is what i'm worried about :(

[tonyb]

LSi9 + 28" speaker stand + 1 bengal cat = broken LSi9

so besides wanting to extend the lower range of the MTM array, i want those speakers to last more than a day :)

~30lbs speaker falling over 2ft...it will be messy

One hell of a cat....get stands that can be filled with lead shot so they won't get knocked over....and a spray bottle filled with h20 for that cat when he goes near 'em.

[SlowcarIX]

What kind of speaker stands were those?

I just purchased a pair of Target MR28 speaker stands. I hope those wont be bumped over by a cat. :)

i put these carpet protector (vinyl sheet with spikes on one side) to help keep him off. You can get it from home depot...it works 80% of the time...when he goes nuts...it does not make a diff with them on

[candyliquor35m]

One spray of cologne or perfume on the area helps too.

[Face]

I would try pepper spray.

[cfrizz]

LOL! That's the risk you take with cats. They love being on top of the world & will jump on anything that will get them there!

[SlowcarIX]

this is turbo, the 15lb bengal

[candyliquor35m]

I've also found if you put a small vase or almost anything on top so it appears there's not enough room for them, they are usually smart enough not to try it.

[Face]

One of these on top of each speaker would probably work too.

[SlowcarIX]

these might work well too

[SlowcarIX]

I agree, I would make changes elsewhere before tearing open and possibly messing up the Lsi15's. I presume you are talking about mainly 2 channel performance, try moving the speaker closer to you and toeing them in a little. It looks like you are sitting back a bit and the first reflection points of your right speaker can be hitting your front door alcove without toe in. The stacked subs are also interfering with your soundstage. Also pull the 15's out from the back wall and into the room more, it will not look as nice but should improve the sound substantially.

It looks like you have a wide glass-topped coffee table in front of the couch, if you are that critical of the sound that you are going to change your crossovers, I would nix the table first.

Through my research and speaking with industry pros here and there, it is of the opinion that Ice power amps do not perform as well with ohm dips. Being that the 15's are 4 ohm, this may be a challenge at the lower register.

Every amp is different, some amps are "restricted" when plugged into a power conditiner. Try changing from the high voltage outlet to one of the digital banks on the PF60 and see if you hear a difference. Also try bypassing the PF60 altogether for the amps. I have the PF60 also and like it a lot, but at the end of the day, plugging a high end amp and AVR into a $200 conditioner may not have all its potential. Good luck.
Venom

the icepowered amps put out 500w@4ohms - is that an issue only when driven hard?

the slab of glass will be moved

[michael_w]

One spray of cologne or perfume on the area helps too.

As long as it doesn't touch the piano black finish ;)

When I read the title of this thread I was picturing Las's thread about taking a chainsaw to a polk and cutting it in half...

[SlowcarIX]

these things are capable to 45A

http://www.icepower.bang-olufsen.com...ker/ASP_SERIES

[SlowcarIX]

As long as it doesn't touch the piano black finish ;)

When I read the title of this thread I was picturing Las's thread about taking a chainsaw to a polk and cutting it in half...

lol, chainsaw it into 1/2 and boring a hole at the back of the cabinet :D

[Midnite Mick]

Why do you have the speakers reversed?