Speaker/crossover dilemma.

keyboard123 · 21st December 2010, 07:45 PM

Hello Everyone,

Here's my dilemma.
I have a pair of 300B monoblocks fed by a DAC . I want to build a set of 3-way OB's for the amps. Now i have two choices for crossovers , and i see the advantages of an active x-over (DCX for example),towards which i'm leaning.

So how would i go about it ? or its not possible?

Please give me your opinions.
Thanks.

sreten · 21st December 2010, 08:18 PM

Hi,

Your post does not make any sense, unless your planning
on 4 more amplifiers. Go about actually doing what ?

rgds, sreten.

jeffreybehr · 21st December 2010, 08:43 PM

Key, if you use an active filter/crossover, you need 4 more channels of amplification.

If you stay with 2 channels of amplification, you'll have to use passive filters.

With 6 - 8 Watts of power per channel, your drivers will have to be fairly sensitive to get good dynamic range and levels from the system..

keyboard123 · 22nd December 2010, 03:21 AM

Thanks Jeff,
I was afraid so. i would need more amps, or a passive XO for the OB, or just high sensitive horns.
I love my tube amps, but in my quest for higher music may have to go solid-state.

coldcathode · 22nd December 2010, 12:12 PM

Quote:

Originally Posted by keyboard123

Thanks Jeff,
I was afraid so. i would need more amps, or a passive XO for the OB, or just high sensitive horns.
I love my tube amps, but in my quest for higher music may have to go solid-state.

Keyboard, 300B's in SET are NICE tubes, rather than go SS, why not look into a set of horns and then use a chip amp to drive some woofers for the low end? if need be.

I good pair of horns and the 300B amps should still get you loud enough to disturb the neighbors? what speakers are they driving now?

keyboard123 · 23rd December 2010, 01:21 AM

Thanks CC,
Originally , I was on the path to building a pair of horns. Then I came across the reviews on OpenBaffles, fell for them , then saw the Beringers DCX, i believe i was reading too much.
After your input, I think I have two ways to choose from. 1.
Horns, 2. openbaffles with passive XO.(one of the Lampizators).
Right now ther'e running an old pair of Technics 3-ways. Nothing special about them.
This site really intrigues me : DIGITAL AMPLIFIER PACKAGES - Digital audio system setup, digital crossover settings, Panasonic XR45 and Behringer DCX2496.

A shortcut way to putting some SS Hi-Fi together. and something to compare with maybe?

keyboard123 · 23rd December 2010, 01:32 AM

Or as SRETEN guessed add a pair of Stereo 300B's to the show, introduce the DCX and OB's?

coldcathode · 23rd December 2010, 11:19 AM

I think you really need to get a pair of high sensitivity speakers hooked up to the 300Bs. I have been building tube amps for a few years now and at the beginning I almost gave up on them because my original "reference" speakers were only about 86dB @ 1W.

Picked up a set of Yamahas that had about 91dB and the sound was more to my liking because the amps worked in a more linear region of the curves @ my listening levels.

I am presently working on a system that will be "tri-amped". Mostly tube but some SS "hybrid" stuff.

A 6SN7 Tube preamp with an OP-Amp based 24dB/Octave Linkwitz crossover on the chassis will split off the subs - mid/highs @ about 65hz. The sub amp is going to be a "hybrid" chip amp. Think of a Williamson Push Pull amp where the output tubes are (3) LM3886 chips paralleled about 300 Watts/channel.

The mid - high XO is all tube 4th order Linkwitz @ about 2200hz with Push Pull tube amps driving the mids and tweets.

keyboard123 · 24th December 2010, 01:02 AM

Hi CC,
Your project looks interesting. Something i will look into.
And

what speakers do you plan to use with them.

21st December 2010, 07:45 PM	#1
keyboard123 diyAudio Member Join Date: Mar 2009 Location: Brampton,ON.	Speaker/crossover dilemma. Hello Everyone, Here's my dilemma. I have a pair of 300B monoblocks fed by a DAC . I want to build a set of 3-way OB's for the amps. Now i have two choices for crossovers , and i see the advantages of an active x-over (DCX for example),towards which i'm leaning. So how would i go about it ? or its not possible? Please give me your opinions. Thanks.

21st December 2010, 08:18 PM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, Your post does not make any sense, unless your planning on 4 more amplifiers. Go about actually doing what ? rgds, sreten. __________________ There is nothing so practical as a really good theory - Ludwig Boltzmann When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

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21st December 2010, 08:43 PM	#3
jeffreybehr diyAudio Member Join Date: Mar 2005 Location: Phoenix, Arizona USA	Key, if you use an active filter/crossover, you need 4 more channels of amplification. If you stay with 2 channels of amplification, you'll have to use passive filters. With 6 - 8 Watts of power per channel, your drivers will have to be fairly sensitive to get good dynamic range and levels from the system..

22nd December 2010, 03:21 AM	#4
keyboard123 diyAudio Member Join Date: Mar 2009 Location: Brampton,ON.	Thanks Jeff, I was afraid so. i would need more amps, or a passive XO for the OB, or just high sensitive horns. I love my tube amps, but in my quest for higher music may have to go solid-state.

23rd December 2010, 01:21 AM	#6
keyboard123 diyAudio Member Join Date: Mar 2009 Location: Brampton,ON.	Thanks CC, Originally , I was on the path to building a pair of horns. Then I came across the reviews on OpenBaffles, fell for them , then saw the Beringers DCX, i believe i was reading too much. After your input, I think I have two ways to choose from. 1. Horns, 2. openbaffles with passive XO.(one of the Lampizators). Right now ther'e running an old pair of Technics 3-ways. Nothing special about them. This site really intrigues me : DIGITAL AMPLIFIER PACKAGES - Digital audio system setup, digital crossover settings, Panasonic XR45 and Behringer DCX2496. A shortcut way to putting some SS Hi-Fi together. and something to compare with maybe?

23rd December 2010, 01:32 AM	#7
keyboard123 diyAudio Member Join Date: Mar 2009 Location: Brampton,ON.	Or as SRETEN guessed add a pair of Stereo 300B's to the show, introduce the DCX and OB's?

23rd December 2010, 11:19 AM	#8
coldcathode diyAudio Member Join Date: Jan 2009	I think you really need to get a pair of high sensitivity speakers hooked up to the 300Bs. I have been building tube amps for a few years now and at the beginning I almost gave up on them because my original "reference" speakers were only about 86dB @ 1W. Picked up a set of Yamahas that had about 91dB and the sound was more to my liking because the amps worked in a more linear region of the curves @ my listening levels. I am presently working on a system that will be "tri-amped". Mostly tube but some SS "hybrid" stuff. A 6SN7 Tube preamp with an OP-Amp based 24dB/Octave Linkwitz crossover on the chassis will split off the subs - mid/highs @ about 65hz. The sub amp is going to be a "hybrid" chip amp. Think of a Williamson Push Pull amp where the output tubes are (3) LM3886 chips paralleled about 300 Watts/channel. The mid - high XO is all tube 4th order Linkwitz @ about 2200hz with Push Pull tube amps driving the mids and tweets.

24th December 2010, 01:02 AM	#9
keyboard123 diyAudio Member Join Date: Mar 2009 Location: Brampton,ON.	Hi CC, Your project looks interesting. Something i will look into. And what speakers do you plan to use with them.

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