Amps for Raidho D3's

[dlb2]

Thanks Wizard!! What amp was that?

Shindo Apetite.









Sorry, I couldn't resist! :fingers:

 

[Mike]

And only 25 for damping factor, wow!

Just keep in mind 25 is probably great for 99.9999999% of the speakers out there. I'm trying to find an amp for the .00000001%!

 

[iamhifi]

I have Crown pro amps Macro 1200 and macro 2400, and both have 1000 damping factor and a must to have control of the woofers and not to move much to avoid friction, as friction heats up coil and bye bye woofers. And yes bass that seats you down. Does it mean that has a heck of a sound, well for pro sound it does. So for HiFi maybe is not as important.

 

[iamhifi]

Just keep in mind 25 is probably great for 99.9999999% of the speakers out there. I'm trying to find an amp for the .00000001%!

Mike,
You will find it, i'm sure is out there

 

[wizard]

I've heard the Raidho C4 with Goldmund Telos 390.5.

The Goldmund have no control of the C4, it was a bad sounding demo.
One could clearly heard that the amp have problems with the big C4 speakers.

One can understand why - the Goldmund amp has only 8V of slew rate and 87 of damping factor at 1 kHz/4 ohm.

 

[Dewster]

Would this spec work??

TECHNICAL SPECIFICATIONS
POWER AMPLIFIER
PARAMETER MIN TYPICAL MAX UNITS CONDITIONS
POWER OUTPUT 1000 Watts 20-20K Hz into 8 Ohms
900 Watts 20-20K Hz into 4 Ohms
SENSITIVITY 1.0 Vrmsin for 100 Wattsout into 8Ω, 29dB gain selected
2.0 Vrmsin for 100 Wattsout into 8Ω, 23dB gain selected
2.46 Vrmsin for 600 Wattsout into 8Ω, 29dB gain selected
4.92 Vrmsin for 600 Wattsout into 8Ω, 23dB gain selected
3.0 Vrmsin for 900 Wattsout into 8Ω, 29dB gain selected
6.0 Vrmsin for 900 Wattsout into 8Ω, 23dB gain selected
INPUT IMPEDANCE 15K Ohms balanced input (XLR)
16K5 Ohms single ended input (RCA)
THD+N .005 % 20Hz to 20KHz at 600 Watts into 8Ω
.007 % 20Hz to 20KHz at 900 Watts into 4Ω
NOISE 110 dB Input shorted, 20Hz to 20KHz, gain set to 29dB
113 dB Input shorted, 20Hz to 20KHz, gain set to 23dB
SLEW RATE 60 V/µsec
POWER BANDWIDTH <1 >100K Hz
DAMPING FACTOR 300 at 20Hz, ref 8Ω
WEIGHT 36.4 (80) Kg (lbs) including box and packing (i.e. shipping weight)
POWER CONSUMPTION 215 Watts at idle
1486 at 1000 Wattsout into 8Ω
2640 at 1300 Wattsout (at onset of clipping) into 8Ω
HEAT DISSIPATION 733 BTU/hr at idle
1658 at 1000 Wattsout output into 8Ω
4572 at 1300 Wattsout (at onset of clipping) output into 8Ω

 

[NorthStar]

I have Crown pro amps Macro 1200 and macro 2400, and both have 1000 damping factor and a must to have control of the woofers and not to move much to avoid friction, as friction heats up coil and bye bye woofers. And yes bass that seats you down. Does it mean that has a heck of a sound, well for pro sound it does. So for HiFi maybe is not as important.

That's what I always thought. And 50 (damping factor) would be the very strict minimum (for both 8 and 4 Ohm loads).
Heck, 100 for me is the bare minimum! ...And all across the entire audio spectrum range (20 to 20).

But! Some people look for some' different I guess.

 

[joeinid]

Looks like a Bryston 28BSST2, , I think so.....

Would this spec work??

TECHNICAL SPECIFICATIONS
POWER AMPLIFIER
PARAMETER MIN TYPICAL MAX UNITS CONDITIONS
POWER OUTPUT 1000 Watts 20-20K Hz into 8 Ohms
900 Watts 20-20K Hz into 4 Ohms
SENSITIVITY 1.0 Vrmsin for 100 Wattsout into 8Ω, 29dB gain selected
2.0 Vrmsin for 100 Wattsout into 8Ω, 23dB gain selected
2.46 Vrmsin for 600 Wattsout into 8Ω, 29dB gain selected
4.92 Vrmsin for 600 Wattsout into 8Ω, 23dB gain selected
3.0 Vrmsin for 900 Wattsout into 8Ω, 29dB gain selected
6.0 Vrmsin for 900 Wattsout into 8Ω, 23dB gain selected
INPUT IMPEDANCE 15K Ohms balanced input (XLR)
16K5 Ohms single ended input (RCA)
THD+N .005 % 20Hz to 20KHz at 600 Watts into 8Ω
.007 % 20Hz to 20KHz at 900 Watts into 4Ω
NOISE 110 dB Input shorted, 20Hz to 20KHz, gain set to 29dB
113 dB Input shorted, 20Hz to 20KHz, gain set to 23dB
SLEW RATE 60 V/µsec
POWER BANDWIDTH <1 >100K Hz
DAMPING FACTOR 300 at 20Hz, ref 8Ω
WEIGHT 36.4 (80) Kg (lbs) including box and packing (i.e. shipping weight)
POWER CONSUMPTION 215 Watts at idle
1486 at 1000 Wattsout into 8Ω
2640 at 1300 Wattsout (at onset of clipping) into 8Ω
HEAT DISSIPATION 733 BTU/hr at idle
1658 at 1000 Wattsout output into 8Ω
4572 at 1300 Wattsout (at onset of clipping) output into 8Ω

 

[wizard]

More amps - Damping factor 20Hz-20kHz/ 8 ohm
Measured by Stereophile.

Krell Evo 600e - 65
Plinius Ref - 35-31
Ayre MX-R - 35-32
Pass XA 30,5 - 100-80
Lamm M1,2 - 53-40
Bryston 28B SST2 - 133-62
D'Agostino Mono - 38-35

 

[Dewster]

Looks like a Bryston 28BSST2, , I think so.....

 

[joeinid]

Ha! I knew it. Mike would say no but I really think the 28's would sound great. Especially on D2's Sure D3's would be a little tougher. I would live with it before you get rid of the 28's. You might be surprised. My Dartzeel is wonderful on my Studio2 and everyone except Mark said it would not work. Smartypants.

 

[Mike]

Wizard - any idea of the specs on the Jeff Rowland gear? They seem to pair Jeff Rowland and Raidho in North America for demos quite a bit. The printed specs just say "greater than 200" - which is still good given the relative specs of the others listed.

From Stereophile:

"I thought the Raidho D-1 loudspeaker ($28,000/pair, including stands), was among the most interesting and musically impressive new products at SSI. Raidho, a Danish company known for their work with ultra-lightweight ceramics, has developed a process for bonding to their speaker diaphragms a thin coat of industrial diamond, conferring even greater stiffness and freedom from unwanted resonances. Paired with a Jeff Rowland Aeris D/A converter and Jeff Rowland 625 power amplifier, the Raidhos were impressive on a variety of material. We’ve all heard demonstrations where we came away saying, “I can’t believe they got so much bass out of such little loudspeakers,” but in terms of the sheer quality and scale of that bass, the Raidho/Rowland combination was on another plane altogether."

 

[iamhifi]

Mcintosh 2301 Ha Ha!

 

[mdkim]

Mcintosh 2301 Ha Ha!

Too funny.

 

[Mike]

Mcintosh 2301 Ha Ha!

I loved those amps. Of all the gear I have had in and out of my system, those amps I miss the most.

But as a pairing with Raidho - no.

I spoke to Lars this morning for almost an hour. He was listening to my speakers and testing them at that moment (exciting!). We discussed everything from isolation to power to amplification to cables. I had to go lay down and take a nap after the conversation. My brain was hurting.

 

[wizard]

Wizard - any idea of the specs on the Jeff Rowland gear? They seem to pair Jeff Rowland and Raidho in North America for demos quite a bit. The printed specs just say "greater than 200" - which is still good given the relative specs of the others listed.

From Stereophile:

"I thought the Raidho D-1 loudspeaker ($28,000/pair, including stands), was among the most interesting and musically impressive new products at SSI. Raidho, a Danish company known for their work with ultra-lightweight ceramics, has developed a process for bonding to their speaker diaphragms a thin coat of industrial diamond, conferring even greater stiffness and freedom from unwanted resonances. Paired with a Jeff Rowland Aeris D/A converter and Jeff Rowland 625 power amplifier, the Raidhos were impressive on a variety of material. We’ve all heard demonstrations where we came away saying, “I can’t believe they got so much bass out of such little loudspeakers,” but in terms of the sheer quality and scale of that bass, the Raidho/Rowland combination was on another plane altogether."

The older Rowland amps printed specs say "greater than 300" - 20-20 /8ohm.
When Stereophile measured the "greater than 300" damping factor was at 20 Hz and 1 kHz - 320.
At 20 kHz it fall down to 23.

Slew rate on the older amps was 30V.
A little slow.

On 825 and 925 the specs say "greater than 1000" at 1 kHz.
This is the same as the older 312.

 

[socfan12]

The older Rowland amps printed specs say "greater than 300" - 20-20 /8ohm.
When Stereophile measured the "greater than 300" damping factor was at 20 Hz and 1 kHz - 320.
At 20 kHz it fall down to 23.

Slew rate on the older amps was 30V.
A little slow.

On 825 and 925 the specs say "greater than 1000" at 1 kHz.
This is the same as the older 312.

The older Rowland amps were never the model of speed, but they did have relatively high current output. My 8TiHC puts out 50amps continuous, 100 peak. The 625/725 amps peak around 50amps I believe. Not sure what the 825 and 925 put out current wise.

 

[the professor]

very cool

does that mean he will be shipping them out this week. Is he sending you pics?

I loved those amps. Of all the gear I have had in and out of my system, those amps I miss the most.

But as a pairing with Raidho - no.

I spoke to Lars this morning for almost an hour. He was listening to my speakers and testing them at that moment (exciting!). We discussed everything from isolation to power to amplification to cables. I had to go lay down and take a nap after the conversation. My brain was hurting.

 

[wizard]

Pictured is the €45000 German Horch Power Stage - this is a newer version of Dynaudio Arbiter.
One of my friends drives the very difficult Dynaudio Evidence Master with them.

Power output is 480 watt in 8 ohm, Slew rate of 100V, output current of 120A and two damping factor choices - 1500 or 50.

My friend damping factor favorite is 50, 1500 not sounding so good.

 

[Mike]

very cool

does that mean he will be shipping them out this week. Is he sending you pics?

He said, "I will test them for another 24 hours, then tomorrow, box them up and ship them off." I'll email him and ask for pictures.

Mike