Bi amp Carver Amazing Platinums....

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jonsoulman
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Bi amp Carver Amazing Platinums....

Post by jonsoulman » Sun Oct 21, 2012 6:45 pm

My current system includes a Denon DP1000 with SME arm and MC cartridge (tweeked)
ARC SP 8
pair of ARC Classic 120s
All interconnects, power conditioning and speaker cable are Transparent.
I have three dedicated 20 amp circuits
Von Shweikert tower sub (powered with carver 800w amp)
Carver Amazing Platinum speakers.

I am currently using the passive crossovers in the Platinums with the "base" turned down completely and using the sub for fill below 100hz.
I want to bi amp the Amazings
Listening room is 24'x45' with a 20' vaulted ceiling and good base traps in back (behind listener) 24' wall

I have an ARC EC21 I could use for an active crossover.
Anybody have suggestions for crossover points and slope?
Any other suggestions?
Newbie here. First posting
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Re: Bi amp Carver Amazing Platinums....

Post by TNRabbit » Sun Oct 21, 2012 7:20 pm

Most have made the crossover upwards of 200 hz, but I personally find the sound more pleasing when I keep it around 160-180 hz. I think the natural falloff of the ribbons to be about 165 hz.

Slope can be 6 dB/octave, but others have used higher slopes with good success. If you're crossover is selectable, you can play with it to find out what you like. FYI, every 6 dB will invert your phase 180 degrees.

You'll want to be able to adjust for ribbon delay to match the woofers (done passively in the passive crossover).
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From FrankieD's lips to your ears: Sunfire - a quiet box of endless power.

Sunfire TG-IV/400~7 Amp
Carver SD/A-360 CDP
Benchmark DAC-1
Sony SACD/DVD-A
Active bi-amp: Ashly XR-1001 & 2 Rane PEQ-15s
Main: HotRodded AL-IIIs
Sub: Klipsch RT-12d
Center: Sunfire CRS-3c
Surround: Sunfire CRS-3 (x 2)

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Martin1970
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Re: Bi amp Carver Amazing Platinums....

Post by Martin1970 » Sun Oct 21, 2012 8:21 pm

Here are my current crossover points. All crossovers are Linkwitz-Riley 24dB/octave.
The Amazing woofers are cut off at 50 Hz because they smoke badly at 100+ dB if you let them play lower. Letting the subs play up to 80 is a no-no, but it works in my tiny room for some reason, ymmv.

Welcome to the forum. Let's see some pics of your system.

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jonsoulman
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Re: Bi amp Carver Amazing Platinums....

Post by jonsoulman » Mon Oct 22, 2012 6:02 pm

Thanks for the quick responses. I have an Audio Research EC21 tube 2 way crossover with a mono bass output. I can figure out the crossover point around 175 or so but I don't know how to make that adjustment for the "ribbon delay". Am I to assume if I have a slope of 12db my phase will be normal? The ARC is not adjustable, I will need to do some soldering...(TNRabbit)

I like the idea of putting a floor on the 12" woofers since I have the VonSweikert (800w) pounding tight well below that 50hz.
That is a very impressive "wall of sound" (Martin1970)

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Re: Bi amp Carver Amazing Platinums....

Post by MRHP » Thu Oct 25, 2012 6:34 pm

Martin1970 wrote:Here are my current crossover points. All crossovers are Linkwitz-Riley 24dB/octave.
The Amazing woofers are cut off at 50 Hz because they smoke badly at 100+ dB if you let them play lower. Letting the subs play up to 80 is a no-no, but it works in my tiny room for some reason, ymmv.

Welcome to the forum. Let's see some pics of your system.

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Re: Bi amp Carver Amazing Platinums....

Post by angelod307 » Thu Oct 25, 2012 10:55 pm

TNRabbit wrote:Most have made the crossover upwards of 200 hz, but I personally find the sound more pleasing when I keep it around 160-180 hz. I think the natural falloff of the ribbons to be about 165 hz.

Slope can be 6 dB/octave, but others have used higher slopes with good success. If you're crossover is selectable, you can play with it to find out what you like. FYI, every 6 dB will invert your phase 180 degrees.

You'll want to be able to adjust for ribbon delay to match the woofers (done passively in the passive crossover).

i won't swear although i know many of the words, but , for every 6db it is 90 degrees out so 12 would be 180. i could and may be wrong. just what i remember from rockford fosgate traing in the late 80's.
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Re: Bi amp Carver Amazing Platinums....

Post by TNRabbit » Fri Oct 26, 2012 3:41 am

angelod307 wrote:
TNRabbit wrote:Most have made the crossover upwards of 200 hz, but I personally find the sound more pleasing when I keep it around 160-180 hz. I think the natural falloff of the ribbons to be about 165 hz.

Slope can be 6 dB/octave, but others have used higher slopes with good success. If you're crossover is selectable, you can play with it to find out what you like. FYI, every 6 dB will invert your phase 180 degrees.

You'll want to be able to adjust for ribbon delay to match the woofers (done passively in the passive crossover).

i won't swear although i know many of the words, but , for every 6db it is 90 degrees out so 12 would be 180. i could and may be wrong. just what i remember from rockford fosgate traing in the late 80's.
Thanks for the correction, Angelo. You are right.
TNRabbit
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From FrankieD's lips to your ears: Sunfire - a quiet box of endless power.

Sunfire TG-IV/400~7 Amp
Carver SD/A-360 CDP
Benchmark DAC-1
Sony SACD/DVD-A
Active bi-amp: Ashly XR-1001 & 2 Rane PEQ-15s
Main: HotRodded AL-IIIs
Sub: Klipsch RT-12d
Center: Sunfire CRS-3c
Surround: Sunfire CRS-3 (x 2)

OconeeOrange wrote:"Gary likes to play it 'loud' as do I. His system begs you turn it up until you die"

RIP WIlliam B. Dibble, 1948-2012. I'll miss you my friend.

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Re: Bi amp Carver Amazing Platinums....

Post by Martin1970 » Fri Oct 26, 2012 5:49 am

MRHP wrote: 400w per/ch to the DQ8 tweeters?!?!?! If so, thats awesome! =D>
The fuses pop pretty regularly on tracks with lots of hf energy.
Really need to get a line of those tweeters or something.

You've got me beat with what you're doing with those 20s!
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Re: Bi amp Carver Amazing Platinums....

Post by MRHP » Sat Oct 27, 2012 2:04 pm

Well thank you for the compliment, I would like to hear your system its interesting how you have it setup. What kind of crossover do you use?
TFM-75 serial #0001
PT-2400 serial #0001
Baby Black Magic serial #0001
Baby Black Magic serial #0002
Cherry/260wpc Mono Blocks
Lightstar Reference
Sunfire Series II 625x2
Carver 490t
OPPO-103
Lucas Labs CF-14
Sunfire Tube pre
DENON DP-62L TT
DUAL CS 5000 TT
DQ-20's
Tesla CF-15 speakers
Douglas Cables
OK ERIC, LET GO OF THE MOUSE AND BACK AWAY FROM YOUR PC WITH YOUR HANDS IN THE AIR. NOW SLOWLY LAY FACE DOWN ON THE FLOOR!!!! - Snoop65

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Re: Bi amp Carver Amazing Platinums....

Post by Martin1970 » Sat Oct 27, 2012 3:18 pm

MRHP wrote:Well thank you for the compliment, I would like to hear your system its interesting how you have it setup. What kind of crossover do you use?
It's a work in progress... needs a much bigger room/house.

The crossover is a Rane RPM-88 multiprocessor, kind of an audio Swiss Army knife.
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