Fanless Amplifier for my IB Sub - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 16 Old 01-11-16, 01:58 PM Thread Starter
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Fanless Amplifier for my IB Sub

My Carvin HD1800 croaked. There's a loud hum. I think it means that something came unsoldered.

I'd like to replace it. It lived in the closet because of the fan noise, and I'd rather have one without a fan.

Here's my existing configuration. The IB sub has four 18" drivers. Each driver is a nominal 8 ohms, and they are arranged to present a single 8 ohm load. The Carvin is spec'ed to deliver 1200W RMS continuous into 8 ohms.

The Sub
Fanless Amplifier for my IB Sub-img_1024.jpg

The channel level control on the Carvin was set to -17dB. In theory, I'm only using 14% of the available power. Does this mean that I only need 170W plus plenty of headroom? Correct me if I'm wrong.

I am looking at the Behringer Reference Amplifier A500. It is spec'ed to deliver 375W RMS into 8 ohms / 1 kHz @ 1% THD. $199. No fan.



Please share your thoughts. Any better suggestions?

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post #2 of 16 Old 01-11-16, 02:42 PM
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Re: Fanless Amplifier for my IB Sub

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Here's my existing configuration. The IB sub has four 18" drivers. Each driver is a nominal 8 ohms, and they are arranged to present a single 8 ohm load. The Carvin is spec'ed to deliver 1200W RMS continuous into 8 ohms.

The channel level control on the Carvin was set to -17dB. In theory, I'm only using 14% of the available power. Does this mean that I only need 170W plus plenty of headroom? Correct me if I'm wrong.
If power delivery and gain adjustments were 100% linear you could probably make that statement, but neither of those really are so you can't actually correlate it that manner. And for dynamic swings in the source material you want/need additional amplification, so some 'extra' is always a good idea.


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I am looking at the Behringer Reference Amplifier A500. It is spec'ed to deliver 375W RMS into 8 ohms / 1 kHz @ 1% THD. $199. No fan.
Do they list the THD in-band for your application (which I assume is 100Hz on down)? Reason I ask is most people construct an IB because they favor high quality sound, but using a low-end amp with 1% THD runs counter to that ideal. You may end up diminishing the experience if you go that route.

-Jim

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post #3 of 16 Old 01-11-16, 06:07 PM
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Re: Fanless Amplifier for my IB Sub

There are several models of old BGW amps that are fanless. You won't get the kind of power output the Carver was delivering, but they're clean and built like tanks.
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post #4 of 16 Old 01-11-16, 07:15 PM
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Re: Fanless Amplifier for my IB Sub

As J-Man mentioned, the gain setting has no bearing on the power output. It’s a combination of that plus the level of the input signal. If your gain setting was really low it could indeed mean that you weren’t using much of the amp’s capabilities, but it could just as easily mean you were feeding it a really hot signal.

Might take a look at Carvin’s DCM-xxxxL series amplifiers. I’ve been using one for a number of years with no issues. It does have a fan, but it’s quiet enough that I can’t hear it at my listening position ~12 ft. away.

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Ayreonaut wrote: View Post
I am looking at the Behringer Reference Amplifier A500. It is spec'ed to deliver 375W RMS into 8 ohms / 1 kHz @ 1% THD. $199. No fan.
The specs aren’t as good as you might think. Carvin rates their amps broadband 20Hz – 20 kHz, while the A500’s power output is only given at 1 kHz. You can be certain that Carvin’s DCM2000L’s 325 watts @ 8-ohms will get more output that Behringer’s 375 watts.

Regards,
Wayne



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post #5 of 16 Old 01-12-16, 09:48 AM Thread Starter
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Re: Fanless Amplifier for my IB Sub

I don;t really want to do Carvin again since mine just died.

What do you think of this one?

Alesis RA500
  • Rated output: 8 ohms, bridged mono mode - 500 watts RMS
  • Signal-To-Noise Ratio: 105dB, 22Hz-22kHz bandwidth referenced to rated output
  • Frequency Response: 10Hz 70kHz +0, -3dB
  • Damping Factor: 200
  • Slew Rate: 120 V/μs (bridged mono)
  • Input Sensitivity: +4dBu (1.23 V) for rated output with input control at maximum

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post #6 of 16 Old 01-12-16, 10:57 AM
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Re: Fanless Amplifier for my IB Sub

To me that seems like a better option than the Behringer. Very solid spec's for the price.

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post #7 of 16 Old 01-12-16, 01:05 PM
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Re: Fanless Amplifier for my IB Sub

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Here's my existing configuration. The IB sub has four 18" drivers. Each driver is a nominal 8 ohms, and they are arranged to present a single 8 ohm load. The Carvin is spec'ed to deliver 1200W RMS continuous into 8 ohms.
So you were running the Carvin bridged?

Regards,
Wayne



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post #8 of 16 Old 01-12-16, 03:08 PM Thread Starter
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Re: Fanless Amplifier for my IB Sub

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So you were running the Carvin bridged?
Yes, I enabled bridging and ran a single cable from the amp to the woofers.

The four woofers are arranged in series/parallel, like this:


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Last edited by Ayreonaut; 01-12-16 at 03:39 PM.
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post #9 of 16 Old 01-12-16, 03:09 PM Thread Starter
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Re: Fanless Amplifier for my IB Sub

Any model numbers to look for?

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DqMcClain wrote: View Post
There are several models of old BGW amps that are fanless. You won't get the kind of power output the Carver was delivering, but they're clean and built like tanks.

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We will add your biological and technological distinctiveness to our own.
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post #10 of 16 Old 01-12-16, 03:17 PM Thread Starter
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Re: Fanless Amplifier for my IB Sub

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If power delivery and gain adjustments were 100% linear you could probably make that statement, but neither of those really are so you can't actually correlate it that manner. And for dynamic swings in the source material you want/need additional amplification, so some 'extra' is always a good idea.
Yeah, I started thinking about that some more after I wrote it. Running with the amp gain set to -0dB would probably not correspond to the maximum possible continuous output on some "demanding" program material.

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