Damnit I Think Rti's Are Better Than Lsi's!

marker

Big difference between driving new speakers at a volume of -10 and running a new engine at the red line for an hour hoss.:rolleyes:

jdhdiggs

Something you missed:

Most receivers are setup for ONLY 8 Ohm speakers. Some of the HTIB and bookshelf systems are different in that the amp section is tailored to the speaks that come with it.

So: If the signal says to the amp section "Give me 70V" and the receiver can only handle 20 Amps out, well for an 8 ohm speaker, you are pulling 17.5 amps, a 4 ohm, 35 amps shorting out the system and blowing the speakers. Granted, the second case is a lot more power. So much so that the built in safety's of the receiver were overloaded

As for number of speakers, this has nothing to do with how much power a speaker needs. My speakers only have 2 drivers and are some of the hardest to drive speakers possible. Remember, you might double the number of speakers, but each speaker only needs half the power now for the same volume. The effecive accoustic power is the same, so is the load on the amp.

Where you are indirectly correct is the low end. Typically every octave drop requires double the power for the same SPL. In other words, if it takes 10W for the 80Hz, it's 20W for 40Hz, 40W for 20Hz for the same SPL. This is where the harder load comes from, not the # of drivers. The smaller the speaker, the quicker theses signals get "ignored" and the power demands lessen.

The efficeincy difference between the 4 isn't too terribly drastic (88 for the LSi's and 89 for 10's and 90 for 12's) so as long as there is a decent current capability in the amp, the RTi's will become the harder load with low Hz material. Once X-overed to a sub though, the LSi's will run away with the "harder" speaker award across the board.

In the end: power is power, regardless of how it is derived. Also, I would not warn people about destroying their speakers with a decent reciever on the RTi series while I would on the LSi's.

marker

Originally posted by jdhdiggs
As for number of speakers, this has nothing to do with how much power a speaker needs. My speakers only have 2 drivers and are some of the hardest to drive speakers possible. Remember, you might double the number of speakers, but each speaker only needs half the power now for the same volume. The effecive accoustic power is the same, so is the load on the amp.

I have to disagree there. Take a Denon 3803/5 for example. It can and will drive a pair of LSi 7 or even LSi9, but hook up a full surround set of 5, 6 or 7 of them to it and it has no chance whatsoever on a scene where many or all of the amp channels are in play all at once, even if you have them all crossedover. It simply doesn't have enough gas.

As to the Onkyo receiver I mentioned being tailored to the 5 ohm speakers it came with, maybe so, but it's amp section obviously is still nowhere near as strong as a 3803/5.

My whole point is that the RTi10/12 is more demanding of a load for an amp to drive than the LSi7/9 when full range or large.

On the Klipsch boards, it is said that even the Klipsch RF7 with an efficiency rating of 102 db dips to like a 3 ohm load with it's big dual 12' woofers, and works best with at least a 200 watt per amp.

I'll have to dig it up to find it, but I remember Dr Spec saying the same thing about the RTi12 or RTi150 here before. And my own personal experience with this validates it.

jdhdiggs

You're right, because of the low frequencies, not the number of drivers. About 350W is good for the 150/12's otherwise they can die on the low end and not soud right


As for the 5 channels X-overed... : Most recievers use the same power source so they will have a much greater current capacity in 2 channel than in multiple. Add that with the lower resistance and you'll be shorting out the reciever all over the place.

The Oink may have only been say 20W, but putting 20W into a 2 Ohm load is a different ball game from 20W into an 8 Ohm. Voltage is really easy to generate from a design perspective, current capacity costs the $$$. Still, your comparison does make sense. You would expect the Denon to still perform better than the oink, but the amp design may have had something to do with it.

marker

Say jdhd, weren't you the one with a pair of LSi7 in your office rig, or am confusing you with someone else?

Systems

Originally posted by steveinaz
You buy speakers for their tonal character. Forget price, specs (to a certain degree), and the speakers position in the "line."

Best advice ever. I just figured this out for myself a few weeks ago. Forget everything about what series or level something may be at. Forget people telling you things are too bright or too laid back. Thats a characteristic of the speaker which can be taken as good or bad.

jdhdiggs

Originally posted by marker
Say jdhd, weren't you the one with a pair of LSi7 in your office rig, or am confusing you with someone else?

Yep, dat's me. Rotating them through an HK, Carver and Counterpoint amps.

baron

I just compaired a set of lsi9s against my old rta11ts and the 11ts won hands down
not even close.
the tweeters in the 9s seem to shave off the upper end like a high filter
the tweeters in the 11s are better polk droped the ball high end tweeters ? shame shame when a 22 year old speaker beats the new top of the line

baron

I just compaired a set of lsi9s against my old rta11ts and the 11ts won hands down
not even close.
the tweeters in the 9s seem to shave off the upper end like a high filter
the tweeters in the 11s are better polk droped the ball high end tweeters ? shame shame when a 22 year old speaker beats the new top of the line

amulford

you can say that again

Toxis

What equipment were you using and what style of sound do you prefer? I prefer the LSi's to almost any speaker out there these days. But I've never liked bright tweeters. I'm all about soft and smooth.

michael_w

It takes a bit of getting used to to enjoy the laid back sound of the LSi's in my opinion. At first when compared to other speakers they do sound too laid back but give them a couple hours exclusively then go back to the others and see what you think. LSi's are very detailed and make good recordings shine as well as bad recordings obvious and blunt.

SuperDave

Its just how much they have left that's amazing, I am driving LSi 25's with a Yamaha receiver and they sound great but I don't push the setup. I am waiting (saving) for a powerful 2 channel amp to hook to the preouts to explore the potential of these mighty speakers, a bargain at 2K.


SuperDave
Yamaha RX-V992
Panasonic DVD-A310
Sony XBR 27"
DVR
Polk LSI 25 Fronts
Infinity CC3 Center
Infinity RS1 Rears
Monster THX Cables

baron

Polk rta11t front
polk 10b center front
polk rta 8t rears
polk psw650 sub
polk 5jr rear center & front effects
powered by yamaha rx-v1 flagship through 2 yamaha EQ-550s

a bell in real life is not soft and sweet the ting is followed by a long tail- --that tail is missing from the lsi tweeter I had soft & sweet with my old amp but now I want sound
to sound REAL the bell should sound like it is in the room with you and that is what I have

baron

I forgot to add that the sound source is a pioneer elite dv-45a playing a SACD
of spyro gyra
all cables are monster interlink

SuperDave

listen to pink floyd dark side of the moon studio recording on the lsi25

VR3

Why do you people keep reviving this thread?

By all means, start a new freakin topic...

baron

pink floyd dark side of the moon sacd almost every day

I like it very loud (I feel sorry for the people below me)

Tequila

Ohhhh...