• Check out the Annual AK Secret Santa exchange Program, signup before November 23rd in the AK Charities & Christmas forum!

Open Baffle Epiphany!

davidro said:
like this right?

L-bracket_corner.jpg
Click to expand...

If I didn't know any better I'd say that looks like a frame for one of them fancy absorption panels. :scratch2: :yes: :smoke: :beer:
 
Oh Michael I've ordered and paid for them Acoustisorb3 already....about to pick them up when they're in stock :smoke:
 
evsentry3 said:
Is this the same as the Marantz 1030 you are referring to?

http://www.classic-audio.com/marantz/1030.html

If so, I do not see a preamp output. Or is there a more recent model with the same designation? A tape loop output is not the same as a preamp out as it does not have the volume control prior to it's output. Yes, you get audio out, but it will be the same level all the time. If so, how would you keep the bass at the right level to match the main speakers?

In looking at the wording on the plate amp, it makes it sound like the RCA out's are a loop through function. If that's correct, then the line level coming out is not high pass filtered. IE...the bass is not rolled off. They are apparently just making the same audio be able to wire onto another amplifier. All that means, as I said before, is that you have to pay attention to the mains still having that full range signal coming back to them. With smaller full range drivers, that can be a problem and require you to remove the low frequencies you have the bass unit using.

EV3
Click to expand...
My Marantz 1030 does have the preamp In and Out as shown in the attached pictures. There is a high filter on the amp, but I would think that this is part of the preamp function, and will not work as a high pass filter for the full range driver.

What would the proper frequency be for a high pass filter? Are these installed between the speaker and the amplifier? I think I understand this better than I did previously. Thanks!
 

Attachments

  • image.jpg
    image.jpg
    78.7 KB · Views: 47
Bonkers60 said:
My Marantz 1030 does have the preamp In and Out as shown in the attached pictures. There is a high filter on the amp, but I would think that this is part of the preamp function, and will not work as a high pass filter for the full range driver.

What would the proper frequency be for a high pass filter? Are these installed between the speaker and the amplifier? I think I understand this better than I did previously. Thanks!
Click to expand...

With what you show in the picture, then yes, you are in good shape! Wire from the preamp out to the plate amp in. Then from the plate amp out to the power amp in. Now the crossover function in the woofer plate amp is going to set the point the woofer rolls in.

What kind of filter the preamp gives you, I have no idea. Possibly a rumble filter for TT use?

But assuming the power amp doesn't provide crossover function when you loop through audio, then you either have to be aware of the amount the lows are causing you're mains to move as raise volume level, or you provide a high level crossover function for them between the power amp and the main speakers.

The frequency would ideally be the same point you set the plate amp to. For instance, 100hz. You would need to use one of the many web resources to assist in picking the component values necessary to reduce the amount of the lowest frequencies to the main drivers.

EV3
 
evsentry3 said:
With what you show in the picture, then yes, you are in good shape! Wire from the preamp out to the plate amp in. Then from the plate amp out to the power amp in. Now the crossover function in the woofer plate amp is going to set the point the woofer rolls in.

What kind of filter the preamp gives you, I have no idea. Possibly a rumble filter for TT use?

But assuming the power amp doesn't provide crossover function when you loop through audio, then you either have to be aware of the amount the lows are causing you're mains to move as raise volume level, or you provide a high level crossover function for them between the power amp and the main speakers.

The frequency would ideally be the same point you set the plate amp to. For instance, 100hz. You would need to use one of the many web resources to assist in picking the component values necessary to reduce the amount of the lowest frequencies to the main drivers.

EV3
Click to expand...
I listen to vinyl frequently but I don't have a rumble filter. I will be investigating. I'm hoping to get my full range drivers tomorrow so that I can start playing.
 
Mister Pig said:
Well I think that is plenty of power for the Hawthorne Sterling Silver driver, I take it that is the one you are considering? There are a few other co-ax drivers out on the market that are used for open baffle speakers, such as the P Audio. Actually if I were doing this from a scratch build, I think I would go with the woofer only version of the Sterling Silver, and use the Heil tweeter, cloning the upper end builds such as those Rainier speakers. But I think OB speakers sound good enough to warrant investing that kind of money. But the devil is in the details, and the crossover makes or breaks a multi driver speaker in most cases. The Hawthorne forum should have the resources to plan out the needed x-over if you don't go the path of generating your own computer modeled x-over.

Regards
Mister Pig
Click to expand...
Hawthorne brags a bit about the quality & design of their x-over, so would likely go with what they have. Will be a while before I try this. Too many other projects and it is becoming 'outside' time now that Spring is here. Something more fitting to start next November. Will use the intervening time to read more.
 
Though many of you might already know, for those of you using active x-overs with balanced XLR inputs/outputs for your OB's, and having to connect to unbalanced RCA inputs in your amps here is an adapter cable that will not break the bank is good quality and I find them more convenient and less expensive than plain XLR to RCA adapters: XLR Male and XLR Female. They come in lengths from 18" all the way to 50'.
 
PR Audio said:
Though many of you might already know, for those of you using active x-overs with balanced XLR inputs/outputs for your OB's, and having to connect to unbalanced RCA inputs in your amps here is an adapter cable that will not break the bank is good quality and I find them more convenient and less expensive than plain XLR to RCA adapters: XLR Male and XLR Female. They come in lengths from 18" all the way to 50'.
Click to expand...

+1:thmbsp:
 
Bonkers60 said:
I listen to vinyl frequently but I don't have a rumble filter. I will be investigating. I'm hoping to get my full range drivers tomorrow so that I can start playing.
Click to expand...

I have had at least 8 different high end tables (for the time) and I have never had nor needed a rumble filter.
I know a lot of people that have had them, I never saw the need.
 
kyle said:
I have had at least 8 different high end tables (for the time) and I have never had nor needed a rumble filter.
I know a lot of people that have had them, I never saw the need.
Click to expand...
Just want to learn more about them (don't want to go off track on this thread). I haven't got my Fostex drivers yet, as the USPS cannot seem to find the address that I have had for 14 years. The package could be marked wrong, though Madisound has the correct address. Hoping for a follow up email tomorrow.
 
MX117.MC7150 said:
With price NOT a consideration, are the Alphas the best 15" driver offered by PEx for an OB application with SET amps?
Click to expand...

Surely the DIY community would've discovered something by now if it existed. I mean, not everybody is on a tight budget and there are plenty out there who are willing to pony up more coin for better performance. When MJK made the move from the Alphas and Goldwoods he went straight to Acoustic Elegance. I can't say I've seen anyone powering any of AE's LF drivers in an OB with SET power, though.
 
cubdog said:
I could have saved myself almost $40. :sigh: Three of my four are still in their boxes.

cubdog
Click to expand...
Maybe they will let you "return" them, and then sell them back to you. Their website states a 45 day no hassle return policy. Could be worth making a phone call.
 
You must log in or register to reply here.
Back
Top Bottom