upgrading to lis15s?

okiepolkie

The 1075 would be great for LSi7's, but the 15's need more power.

Also, (and this is a personal opinion) look into something besides the Monster Cable speaker wire. Look at www.signalcable.com, or something similar.

andyisc00l

Heck I don't mind putting in 250-300watts as long as there isn't an increase in risk........

have people reported damage from more watts and has polk ever commented on using more watts?

andyisc00l

okiepolkie wrote:

The 1075 would be great for LSi7's, but the 15's need more power.

Also, (and this is a personal opinion) look into something besides the Monster Cable speaker wire. Look at www.signalcable.com, or something similar.

only reason I'm looking at monter cable is cuz I can get $200 rcas for $30

and the rated power on the lsi15s is 250 watts RMS max, why would they say 250 max and then 200watts isn't enough power?

ohskigod

there is a general school of thought that the LSi's reward you for more power. I experienced that myself, hence the silly amount of power I'm sending to them.

andyisc00l

ohskigod wrote:

there is a general school of thought that the LSi's reward you for more power. I experienced that myself, hence the silly amount of power I'm sending to them.

can anyone confirm that they've used around 300watts @ 4ohms for the center channel for over 1 year!? I'm just scared ! lol why would they say 200watts max when 300 is ok! That's pretty stupid of them to do...!

andyisc00l

And either the oultaw 7500 or the rotel 1095!?!? Which one?!?!

cheddar

If you can get monster stuff at a discount, why not just get an mpa 2250 and 3250 to drive your system. That's what I have now for my LSis and they rock. It's 400W at 4ohms and yes I've had the set-up over a year without blowing the speakers. But if you really understood what usually blows speakers, you wouldn't need this assurance.

A receiver that loses control of the power at 30W can blow your speakers far more easily than an amplifier that is large and in control all the way up to 400W. In everyday listening, you probably won't go above 10-20W at very loud volume levels. If you abuse your ears, you may be able to get it up past 100W maybe 200W at ear bleed/deafening levels. So in reality, the real danger would be trying to push a 100W receiver to loud volume when it would probably clip below that rating.

andyisc00l

cheddar wrote:

If you can get monster stuff at a discount, why not just get an mpa 2250 and 3250 to drive your system. That's what I have now for my LSis and they rock. It's 400W at 4ohms and yes I've had the set-up over a year without blowing the speakers. But if you really understood what usually blows speakers, you wouldn't need this assurance.

A receiver that loses control of the power at 30W can blow your speakers far more easily than an amplifier that is large and in control all the way up to 400W. In everyday listening, you probably won't go above 10-20W at very loud volume levels. If you abuse your ears, you may be able to get it up past 100W maybe 200W at ear bleed/deafening levels. So in reality, the real danger would be trying to push a 100W receiver to loud volume when it would probably clip below that rating.

lol well they still have a combined retail of $5500:-p

I'll probably just find an outlaw or rotel that puts out 300+ watts rms @ 4 ohm...that should be enough right?!?! I sure hope so..

maybe I'll try to find some i can find the $2500 for $700 now new, if I could find the other one for $1000 it might work...I've heard rave reviews... bah $2500 for the both thats too much money :-(

McLoki

andyisc00l wrote:

can anyone confirm that they've used around 300watts @ 4ohms for the center channel for over 1 year!? I'm just scared ! lol why would they say 200watts max when 300 is ok! That's pretty stupid of them to do...!

I have had my setup for a year and was running LSi7's for my front speakers for a year before that.

Amp is rated at 500wpc@ 4 ohms W/ 1100 watt peaks.

I did call polk before I purchased my amp and they told me that they had only recieved a couple of calls of people blowing speakers from to much power. They recieve calls all the time from people running smaller AVR's that blow speakers.

You will be fine. This is one case where size really does matter.

Michael

cfrizz

Let me put it this way Andy. If you blast your speakers with all that power, your eardrums will rupture before your speakers blow!:eek: Then it won't matter how loud you play them!:D

andyisc00l

If I were to buy retail speakers then polk is the way to go..but I've been hearing about "DIY" kits...does anyone have any ideas on how good a $1000 kit will sound (thats how much I'll pay for polk lis15s)...?

andyisc00l

Wow 2500 watts rms @ 4 ohm for 5 speakers is ridconcoulous..lol how does it sound? I'm guessing pretty friggen good..

McLoki

andyisc00l wrote:

Wow 2500 watts rms @ 4 ohm for 5 speakers is ridconcoulous..lol how does it sound? I'm guessing pretty friggen good..

The amp is awesome. To be honest, it is just revealing the next weak link in the chain. For me that is my pre-amp (receiver). I have heard my system with a decent pre-amp it is unbelievable.

I have a passive subwoofer that runs off the 6th channel of the amp so I am actually using it as a 3000-watt amp. (If I turn it on and off to many times to quickly (like four times in less than 2 min or so) I blow the 20-amp breaker it is plugged into in my house).

Like someone else mentioned though. I rarely use that much power. I would guess on average I am only using 2-10 watts (if that much). The difference is when there are peaks (explosions and such), many amps and AVRs will distort. Mine doesn’t.

Michael

faster100

I doubt that thing is getting anywhere near 2500 watts or 3000.. peaks i can see in the hundreds, maybe.. I'm sure its a nice amp but that kinda wattage would blow just about any speaker

edit: i didnt see where he was adding each channel together to get to the 2500 watts,

McLoki

SPECIFICATIONS-

Output Power....... .350 WPC/8 OHMS (typ. 450W)
...........................500 WPC/4 OHMS (typ. 670W)
...........................1000 WATTS MONO (1400 @ 4 ohms)

THD..................... <.015% (full power 15-20Khz)
TIM..................... <.015% at full rated power
Freq. Response...... 2-180 kHz + 0, -3 dB
Input Imped.......... 47K Unbal, 15K Balanced
Configuration......... 3,4,5 or 6 Channel

Dynamic headroom... >3.5 dB! (Typ. 850 watts @ 8 ohms, 1100 watts @ 4 ohms)
Peak Current......... 120 amps per channel (720 amps total) .1sec pulse, .5 ohms
Hum/noise............ -110 dB unweighted
Damping Factor .....Over 1000 (!) (10Hz-1kHz)

Cooling ................Convection w/ on demand silent fan
Weight................ 70 lbs
Dimensions ...........19"Wx8"Hx16"D
AC Voltage........... 100,120,220,240
Recom.Service...... 20 to 30Amps-100,120V (will run adequately on 120V 15 amp service). ...........................20 to 30 Amps-220,240V

faster100

I don't doubt its a nice amp.. but specs are specs..

did you see the page on receivers online, half didnt do half of what the specs said.

and the linked page to your amp, they state you must have 1100 watts for peaks even if you use 10 watts normally.. in HT.. so we have all had it wrong useing 100 -300 watts

No big deal, was just saying i doubt it ever gets near 500 watts for each channel im sure.. all channels on.

McLoki

faster100 wrote:

I don't doubt its a nice amp.. but specs are specs..

did you see the page on receivers online, half didnt do half of what the specs said.

and the linked page to your amp, they state you must have 1100 watts for peaks even if you use 10 watts normally.. in HT.. so we have all had it wrong useing 100 -300 watts

No big deal, was just saying i doubt it ever gets near 500 watts for each channel im sure.. all channels on.

You are right. The specs are just company created specs, no better or worse (from an accuracy standpoint) than any other companies specifictions.

With my 88db efficient speakers, they are only 76db efficient at my 12-14 foot listening distance. (every time the speaker to ear distance doubles, the efficency drops by 6 db) This does not take into effect coupling of multiple speakers or corner loading the system (both would increase the efficiency of the speakers)

1 watt - 76db
2 watts - 79db
4 watts - 82db
8 watts - 85db
16 watts - 88db
32 watts - 91db
64 watts - 94db
128 watts - 97db
256 watts - 100db
512 watts - 103db
1024 watts - 106db
2048 watts - 109db
4096 watts - 112db
8192 watts - 115db


As you can see, I cannot play at reference level without blowing my speakers. (or at least clipping the amp) The loudest I have ever tried to play is -6db. Once you get over 100db though, the power requirements are pretty huge and get bigger fast. (of course this is for peaks, not continuous ratings...)

Michael

Edit - Reference level is listed as 105db peaks from any channel and 115db peaks from the LFE channel (which, in my case, is also running off my amp) all measured from the listening position.

Ruin

Just because you tosss a couple of hundred watts per channel amp at the LSis doesn't mean you need to use them. When people are rocmending a powerfull amp they are recomending it because driving an amp at 50% of its rated power gives less distortion than running it at 90% of its rated power. You pull 100watts/channel out of a 110watt/channel amp you are going to hear distortion in all likelyhood compared to pulling that same 100watts.channel of of a 200watt/channel amp.

So, dont USE all that extra power because yes, there is a limit to what the speakers can stand. However, given the limits of how loud you are likely to really listen to them, you are more likely to blow them with heavy distortion from an underpowered system than you are from overpowering them at low distortion.

Ruin

Drumingman

Let's all say it again.:rolleyes: