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Post by emofrmcgy on Oct 11, 2019 20:16:41 GMT -5
Preaching to the choir here dude.. it's why I use 99db efficient speakers and front loaded horn subwoofers capable of 130db @20hz... 😉 Are you talking about Klipsch speakers? Sorry for the partial derail.   |
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klinemj
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Post by klinemj on Oct 11, 2019 20:48:58 GMT -5
But it doesn't go back "down" to 300... The stereo 4ohm spec is not listed.. But, isn't it listed for 8 ohms? So, yes...it's listed for 8 ohms for STEREO/2 channels driven, but NOT for 4 ohms for STEREO/2 channels driven. If you look at the "all channels driven" data emofrmcgy posted, you will see that the wattage goes UP from 8 to 4 ohms (200 vs. 315 W). That's typical...output does not go down from 8 to 4 ohms. IF a wattage for 4 ohm in "2 channels driven" mode were listed, it would be higher than the 8 ohm rating of 520 watts, not lower. You can't compare the 520 watts @ 8 ohms w/Two Channels Driven to the 315 watts @ 4 ohms for ALL channels driven to say power goes down from 8 to 4 ohms. Mark |
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DYohn
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Post by DYohn on Oct 12, 2019 9:24:21 GMT -5
Besides, every amplifier's power rating is pretty meaningless in every day use, it really only means what the design can produce while still meeting certain performance specs. The typical user will never "use" the max power of an amplifier, although as someone pointed out it is good to have headroom for music transients. But event hen the only reason you might need that headroom is to produce those transients without also producing audible distortion.
I worked for years in car audio and the misconceptions about power were common. I can't tell you how many times I had to explain why a customer's system was not "louder" just because they put in a 200 watt instead of a 100 watt amp. You need 10X the base power to hear it as twice as loud.
Just get a good quality amp that can handle the rated impedance of your speakers and enjoy the music. If you like it loud and you keep hearing distortion, or if your amp shuts down, get a bigger amp.
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Post by AudioHTIT on Oct 12, 2019 11:58:28 GMT -5
It depends on the power supply. I believe there's a big reason the XPA7 GEN 3 went back down to 300 watts per channel in stereo....what's your take? Having owned both the XPA-7 G2 and G3, I believe the power supply is the main reason for the 2-channel power difference. That said, the G3 amp blade/module never specs higher than 300 Watt, even in the high current HC-1 monoblock configuration. So it seems possible the G3 module itself may not have the same capability as the G2, which is to say, it’s probably both components contributing to the difference. |
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Post by gus4emo on Oct 12, 2019 13:05:37 GMT -5
I believe there's a big reason the XPA7 GEN 3 went back down to 300 watts per channel in stereo....what's your take? Having owned both the XPA-7 G2 and G3, I believe the power supply is the main reason for the 2-channel power difference. That said, the G3 amp blade/module never specs higher than 300 Watt, even in the high current HC-1 monoblock configuration. So it seems possible the G3 module itself may not have the same capability as the G2, which is to say, it’s probably both components contributing to the difference. My main concern with all of this is, I bought the XPA7 and was using Bose 301s with an Outlaw sub, play them loud, I mean loud, nothing ever happened to them, replaced them with Deftech SM55, a twitter and two woofers were blown, but, after Crutchfield took care of things everything seems ok, play them loud, but I'm concerned if I play them loud for too long like I used to with the 301s, something might happen, I love the SM55s....now let me ask you, I have an XPA200 for height channels, should I use that to power the SM55s, I can always split the left and right outputs, send the signal to both the XPA7 and the XPA200, then get an amp for the heights.... |
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Post by AudioHTIT on Oct 12, 2019 17:30:13 GMT -5
Having owned both the XPA-7 G2 and G3, I believe the power supply is the main reason for the 2-channel power difference. That said, the G3 amp blade/module never specs higher than 300 Watt, even in the high current HC-1 monoblock configuration. So it seems possible the G3 module itself may not have the same capability as the G2, which is to say, it’s probably both components contributing to the difference. My main concern with all of this is, I bought the XPA7 and was using Bose 301s with an Outlaw sub, play them loud, I mean loud, nothing ever happened to them, replaced them with Deftech SM55, a twitter and two woofers were blown, but, after Crutchfield took care of things everything seems ok, play them loud, but I'm concerned if I play them loud for too long like I used to with the 301s, something might happen, I love the SM55s....now let me ask you, I have an XPA200 for height channels, should I use that to power the SM55s, I can always split the left and right outputs, send the signal to both the XPA7 and the XPA200, then get an amp for the heights.... I would generally say, put your best amp with your best speakers, clean power is your speaker's best friend. Trying to save your speakers by giving them less power is not a good strategy, when you clip an amp it produces more high frequency energy and that's one way to blow your tweeters. This isn't to say you can't overpower a speaker, but under powering it is generally riskier if you listen loud. From what I'm hearing, your Deftech are your best speakers and the XPA-7 is your best amp, if you can't play them loud enough with 200-300 watts, then you probably need a more efficient speaker (or a smaller room  ) If when you play them loud it sounds good (and clean), then you're probably OK. Edit: I just went and looked up the Deftech SM55, they recommend 20-225 Watts, the XPA-7 sounds perfect. They don't give a sensitivity rating, but found a review that says it's 90 dB, so you should comfortably get over 110 dB SPL at 1M (specifically 113). The reviewer even used an Emotiva XPA-1 for the listening tests, they have around 500-600 Watts, so don't worry about overpowering them, I would however get an SPL meter (phone app) and know what levels you like. |
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Post by gus4emo on Oct 12, 2019 17:39:39 GMT -5
My main concern with all of this is, I bought the XPA7 and was using Bose 301s with an Outlaw sub, play them loud, I mean loud, nothing ever happened to them, replaced them with Deftech SM55, a twitter and two woofers were blown, but, after Crutchfield took care of things everything seems ok, play them loud, but I'm concerned if I play them loud for too long like I used to with the 301s, something might happen, I love the SM55s....now let me ask you, I have an XPA200 for height channels, should I use that to power the SM55s, I can always split the left and right outputs, send the signal to both the XPA7 and the XPA200, then get an amp for the heights.... I would generally say, put your best amp with your best speakers, clean power is your speaker's best friend. Trying to save your speakers by giving them less power is not a good strategy, when you clip an amp it produces more high frequency energy and that's one way to blow your tweeters. This isn't to say you can't overpower a speaker, but under powering it is generally riskier if you listen loud. From what I'm hearing, your Deftech are your best speakers and the XPA-7 is your best amp, if you can't play them loud enough with 200-300 watts, then you probably need a more efficient speaker (or a smaller room ) If when you play them loud it sounds good (and clean), then you're probably OK. Since Crutchfield replaced the blown drivers everything seems ok, I played loud last week for about one and a half hours, no problem, maybe the blown drivers were somewhat defective? The SM55s are discontinued, but I bought them brand new, so I don't know, but any way maybe I should just stop panicking, lol.... |
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Post by AudioHTIT on Oct 12, 2019 17:43:41 GMT -5
I would generally say, put your best amp with your best speakers, clean power is your speaker's best friend. Trying to save your speakers by giving them less power is not a good strategy, when you clip an amp it produces more high frequency energy and that's one way to blow your tweeters. This isn't to say you can't overpower a speaker, but under powering it is generally riskier if you listen loud. From what I'm hearing, your Deftech are your best speakers and the XPA-7 is your best amp, if you can't play them loud enough with 200-300 watts, then you probably need a more efficient speaker (or a smaller room ) If when you play them loud it sounds good (and clean), then you're probably OK. Since Crutchfield replaced the blown drivers everything seems ok, I played loud last week for about one and a half hours, no problem, maybe the blown drivers were somewhat defective? The SM55s are discontinued, but I bought them brand new, so I don't know, but any way maybe I should just stop panicking, lol.... See my edit above ... |
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) If when you play them loud it sounds good (and clean), then you're probably OK.