rccarguy3
Distinguished Member
Like I said missing that +/- figure, response is not likely to be 33hz-30khz anoeic
Like I said missing that +/- figure, response is not likely to be 33hz-30khz anoeic
The issue isn't where you cross over to the subs, I'm in a similar position (-3dB at 33Hz, measured in room lower) the issue is the crossover in the speakers.Thanks for the excellent analysis. The speakers are a pair of monitor audio MR6 rated at 150W/CH and according to the manufacturer, can go down to about 33HZ. Despite this I set the crossover to 80HZ ( which is nothing for these speakers ) at the receiver end so any amplification that takes place is 80HZ and above.
Just FYI, I bi-amp both my dedicated cinema mains and my office mains. Cinema has 300wpc into 8 and 600wpc into 4ohms, office has 350wpc into 8 (Rotel don't publish their 4ohm specs but it is the only amp I've ever seen with a BTU rating!). In both cases it made no difference. I've also run those same mains with PA amps, duals sounds better than singles (two transformers) but four didn't sound better than two.When I had it bi-amped with the internal amp of my RXA 3060 rated at 150W x 2 into 8ohms I definitely heard a difference. The front stage sounded more open and spacious, with lots of headroom vs before, plus it was noticeably louder and the dynamic range also seemed a tad more aggressive.
My thinking is if the internal amps of an AVR could have made such a difference, imagine what bi-amping from a dedicated power amp could do? I was just wondering whether 250W from one amp into one speaker will sound better than 110W x 2 bi-amped into the same speaker?
Ha ha ha ha I love the last line. So you don't think bi-amp with two amps rated at 110W each into 8 ohms will sound better than than a single amp rated at 250W into 8ohms?The issue isn't where you cross over to the subs, I'm in a similar position (-3dB at 33Hz, measured in room lower) the issue is the crossover in the speakers.
If you have an 80Hz - 20kHz signal that you feed two of to the speaker, the HF terminals will discard anything below, probably, around 2kHz. So you're left with about 4 octaves of content. The LF terminals will discard anything above 2kHz, leaving you with about 5 octaves of content, so pretty even.
Just FYI, I bi-amp both my dedicated cinema mains and my office mains. Cinema has 300wpc into 8 and 600wpc into 4ohms, office has 350wpc into 8 (Rotel don't publish their 4ohm specs but it is the only amp I've ever seen with a BTU rating!). In both cases it made no difference. I've also run those same mains with PA amps, duals sounds better than singles (two transformers) but four didn't sound better than two.
I'm not saying you didn't hear a difference, but expectation bias and audio memory are tricky characters.
And how does the difference sound to your ears?I went from biamping front three to single amp powering front three.
Biamping for HT seems a bit ott
For hifi I would do it and I have
So the power rating can vary from manufacturer? So 100W from a krell is more powerful than 100W from IOTA?You can use your existing XPA and bi-amp your speakers and you will see what it has to offer. That would actually be a better test because you will use the same amp, and the only variable would be the power-doubling. You can't use a single channel of a powerful Krell and then bi-amp with a Rotel, and expect the bi-amped combo to sound better, because you just bi-amped. I would say it is a waste of resources when you already have 250W on a single channel.
Also, bi-amping with the 110W IOTA power amp you will have less power going to the speakers' woofer, so more likely they would sound worse. (Unless you had 110W Krell Watts )
Absolutely! That's a collosal 500W to each speaker!Bi-amp with your Emotiva and see what bi-amping does. You will just waste 250W on a tweeter I believe.
The IOTA is rated at 110W x 7 into 8ohms. So if I bi-amp with it, it would be 110W to the woofer and another 110W to the midrange and tweeter so 220W in total biamped Vs the 250 single amp from the XPA.A Krell would probably give you 100W@8 Ohm, 200W@ 4 Ohm, 400W @2Ohm. You get the idea. They are exotic power amps and they would sound better. What does the IOTA have to offer? Less power for sure.
Bi-amping does nothing; signal goes through the same filters inside the speakers even when you send a single channel. By sending 110W with the IOTA to the woofer I see you have less power available now. Why do that?
Whats the power rating for the parasound?Do you think I should sell my Parasound JC1 mono blocks and bi-amp with an Emotiva for example?
No.The IOTA is rated at 110W x 7 into 8ohms. So if I bi-amp with it, it would be 110W to the woofer and another 110W to the midrange and tweeter so 220W in total biamped Vs the 250 single amp from the XPA.
400W @8Ohm, 800W @4Ohm. Emotiva would be more.Whats the power rating for the parasound?
Wow so the advice is to just leave the XPA as is? Though remember I said I set the crossover at 80hz so it's not a full range signal I'm amplifying?No.
You use 110w to amplify a full range signal which you then give to the LF terminal which then filters out half (55w). And you use another 110w to amplify a second full range signal which you give to the HF terminal which filters half out (55w). Leaving you with 110w of signal. But you’ve made the amp use up 220w to amplify them meaning you’ve used up headroom and increased noise and distortion.