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Post by knucklehead on Nov 22, 2022 15:14:57 GMT -5
That was my first thought when I saw the power requirements the OP posted. I had a 5 channel Rotel class d amp that was all of 15 lbs. It used Bang & Olefsen 100w (IIRC 150wpc into 4ohms) power modules. It drove a 5.2 setup very decently. All Emotiva speakers, ERT's (loved them!), ERM 6.3 center, and ERD-1 surrounds. The Rotel was half a step better than the Crown class d amps I had prior to the Rotel. And class d keeps getting better. |
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Post by AudioHTIT on Nov 22, 2022 15:57:09 GMT -5
That was my first thought when I saw the power requirements the OP posted. I had a 5 channel Rotel class d amp that was all of 15 lbs. It used Bang & Olefsen 100w (IIRC 150wpc into 4ohms) power modules. It drove a 5.2 setup very decently. All Emotiva speakers, ERT's (loved them!), ERM 6.3 center, and ERD-1 surrounds. The Rotel was half a step better than the Crown class d amps I had prior to the Rotel. And class d keeps getting better. The 502 and 500 Hypex modules are rated 250WPC into 8 ohms — one thing about VTV is that they publish 4 ohm ratings, you have to dig into the product sheet to get 8 Ω ratings. I’ve spoken to Warren about being non-standard, but he doesn’t seem concerned. That’s why I suggested the Pascal modules I use, they are rated at 410 WPC into 8 ohms and 810 WPC into 4 ohms (I have 16 channels of them in 2 x 2U chassis). Edit: I just looked at the VTV site again, Warren has changed some sheets to reference 8 ohms (thank you) … BUT left the numbers for 4 ohms!!! So always check the product sheets for specs. Edit2: The product sheet for the Hypex NCore 502 has also changed, it’s now listing 350WPC into 8 ohms.
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Post by leonski on Nov 22, 2022 18:04:45 GMT -5
I just looked up #405's Allison Speakers. I think they DO deserve the best in amplifier.......But at the listed sensitivity?
It might make sense at this point to go 'dedicated' 2 channel (or pair of monos) for the fronts and a '3 by' for the others......
So you could get amp gain very close but also keep in mind power NEEDS.....
The fronts, IC20, right? Might like a pair of Parasound JC1 while the remaining 3 channels? An A31.
this all depends on enough Available Power at the wall.
I DO appreciate the aestetic #405 is aiming for. The Non-Theater.....Theater.....
I've been in rooms that looked like a stereo store......with nightime tripping hazards.
but I DO like the 'tucked in' look.
BTW? Legacy doesn't HAVE technology. they are buying and repackaging modules from B+O......ICE amps.......
this is fine, but don't get too wrapped up with their specification manipulations.
Two might be a deal breaker, so I'll just say.....Too Bad. I'd have to see it in person. I suspect a little innovative thinking might work here?
I have an International Recitifier 'Reference Board' amplifier out in the garage. The AUDAMP7S, I think. They make it in 4 power levels but I got the 150x2 version with 500 bridged......
Amp needs 50v but will work with somewhat higher or lower values.......
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Post by leonski on Nov 23, 2022 15:32:21 GMT -5
That was my first thought when I saw the power requirements the OP posted. I had a 5 channel Rotel class d amp that was all of 15 lbs. It used Bang & Olefsen 100w (IIRC 150wpc into 4ohms) power modules. It drove a 5.2 setup very decently. All Emotiva speakers, ERT's (loved them!), ERM 6.3 center, and ERD-1 surrounds. The Rotel was half a step better than the Crown class d amps I had prior to the Rotel. And class d keeps getting better. The 502 and 500 Hypex modules are rated 250WPC into 8 ohms — one thing about VTV is that they publish 4 ohm ratings, you have to dig into the product sheet to get 8 Ω ratings. I’ve spoken to Warren about being non-standard, but he doesn’t seem concerned. That’s why I suggested the Pascal modules I use, they are rated at 410 WPC into 8 ohms and 810 WPC into 4 ohms (I have 16 channels of them in 2 x 2U chassis). Edit: I just looked at the VTV site again, Warren has changed some sheets to reference 8 ohms (thank you) … BUT left the numbers for 4 ohms!!! So always check the product sheets for specs. Edit2: The product sheet for the Hypex NCore 502 has also changed, it’s now listing 350WPC into 8 ohms. keep in mind that ALL 'D' amp power ratings at 'maximum' are short term.....Sometimes 15 seconds or 30 seconds. FTC ratings are ALWAYS lower than the published and optimistic specification. this is my block diagram for a 'stereo' biamp module using Ncore amps and power supplies along with a MiniDSP to handle crossover AND a sub output......also assignable.  |
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Post by frogman122 on Dec 10, 2022 12:18:53 GMT -5
Did you get the legacy?
Or another route?
If you’ve made the buy, ignore.
Does Coda make a 5 ch. they make very good reliable amps
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Post by 405x5 on Dec 10, 2022 19:55:54 GMT -5
Did you get the legacy? Or another route? If you’ve made the buy, ignore. Does Coda make a 5 ch. they make very good reliable amps Never heard of coda before and took a looksee. They do make a toy five channel lamp, but nothing even close to the ballpark. |
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Post by MusicHead on Dec 11, 2022 13:48:39 GMT -5
Buckeye custom-built amp? They have a 6-ch with Hypex NC502MP modules, rated at 350w per channel @ 8ohms, all channels driven. www.buckeyeamp.com/shop/p/hypex-nc502mp-amplifier-6-channelA 50W difference over 400W is not much dB-wise. If the can do 6-ch (and 4-ch too) they can certainly do 5-ch. HOWEVER: being the curious person I am when it comes to all things electronics (I suppose working in the semiconductor industry can do that to you 😄), I checked the datasheet of the Hypex NC502MP (from the Hypex website). The 350W @ 8Ohm rating is peak power, at 1kHz and 1%THD. No indication I can see about duration of the peak. The continuous power is 100W @ 8Ohms. Legacy specs 610 watts continuous per channel @ 8 ohms, all channels driven. That is a brutal amount of power... It drives me crazy though that even they are not very forthcoming about over what bandwidth and with what THD. Specs are not everything, but for heaven sake, if you spec something do it in a way that means "something". Besides the "trick" of using 1kHZ, not mentioning THD you can play all sort of games, depending on where in the knee of the Pwr/THD curve you pick your spot. |
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Post by AudioHTIT on Dec 11, 2022 14:10:20 GMT -5
Buckeye custom-built amp? They have a 6-ch with Hypex NC502MP modules, rated at 350w per channel @ 8ohms, all channels driven. www.buckeyeamp.com/shop/p/hypex-nc502mp-amplifier-6-channelA 50W difference over 400W is not much dB-wise. If the can do 6-ch (and 4-ch too) they can certainly do 5-ch. HOWEVER: being the curious person I am when it comes to all things electronics (I suppose working in the semiconductor industry can do that to you 😄), I checked the datasheet of the Hypex NC502MP (from the Hypex website). The 350W @ 8Ohm rating is peak power, at 1kHz and 1%THD. No indication I can see about duration of the peak. The continuous power is 100W @ 8Ohms. Legacy specs 610 watts continuous per channel @ 8 ohms, all channels driven. That is a brutal amount of power... It drives me crazy though that even they are not very forthcoming about over what bandwidth and with what THD. Specs are not everything, but for heaven sake, if you spec something do it in a way that means "something". Besides the "trick" of using 1kHZ, not mentioning THD you can play all sort of games, depending on where in the knee of the Pwr/THD curve you pick your spot. I noticed the same thing when I looked for a Class D amp, and specifically narrowed it down to Buckeye and VTV, it seems pretty common to spec peak power at 1% distortion. I decide on VTV because of appearance, with the Pascal modules rated at 400W+ @ 8Ω. I expect they’re far below 1% where I normally play them. Your point however is well taken, you have to look at power specs differently with class D, and embrace the notion that music is dynamic. I know I’ll never get anywhere close to 400W ACD, but also know that ‘music’ will never demand that. |
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Post by MusicHead on Dec 11, 2022 15:08:08 GMT -5
Buckeye custom-built amp? They have a 6-ch with Hypex NC502MP modules, rated at 350w per channel @ 8ohms, all channels driven. www.buckeyeamp.com/shop/p/hypex-nc502mp-amplifier-6-channelA 50W difference over 400W is not much dB-wise. If the can do 6-ch (and 4-ch too) they can certainly do 5-ch. HOWEVER: being the curious person I am when it comes to all things electronics (I suppose working in the semiconductor industry can do that to you 😄), I checked the datasheet of the Hypex NC502MP (from the Hypex website). The 350W @ 8Ohm rating is peak power, at 1kHz and 1%THD. No indication I can see about duration of the peak. The continuous power is 100W @ 8Ohms. Legacy specs 610 watts continuous per channel @ 8 ohms, all channels driven. That is a brutal amount of power... It drives me crazy though that even they are not very forthcoming about over what bandwidth and with what THD. Specs are not everything, but for heaven sake, if you spec something do it in a way that means "something". Besides the "trick" of using 1kHZ, not mentioning THD you can play all sort of games, depending on where in the knee of the Pwr/THD curve you pick your spot. I noticed the same thing when I looked for a Class D amp, and specifically narrowed it down to Buckeye and VTV, it seems pretty common to spec peak power at 1% distortion. I decide on VTV because of appearance, with the Pascal modules rated at 400W+ @ 8Ω. I expect they’re far below 1% where I normally play them. Your point however is well taken, you have to look at power specs differently with class D, and embrace the notion that music is dynamic. I know I’ll never get anywhere close to 400W ACD, but also know that ‘music’ will never demand that. By the way, least I am misunderstood, when I wrote "if you spec something do it in a way that means "something"", I was referring to the manufacturers. Specifying output power with no BW and no THD is meaningless, whether that be peak (which also add another dimension: time) or continuous. Then it is up to us, the users, to decide how much power we need, based on speaker sensitivity, listening distance, what we listen to, how much dynamic headroom we want/need and of course our personal preferences in term of listening volume. |
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