Marty Cube start. - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

Reply
 
Thread Tools
post #11 of 55 Old 06-01-15, 12:25 PM
Senior Shackster
 
EndersShadow's Avatar
Ender
 
Join Date: Sep 2012
Location: Brownsburg, IN
Posts: 330
My System
Re: Marty Cube start.

Quote:
Anderslober wrote: View Post
Awesome.....thanks. If I were to go with mq600.....then I would NEED a MiniDSP? With the Crown xls...I wouldn't......it has filters built-in......? Just trying to get the best option..........
The MQ-600 would need the Mini-DSP. I believe the Crown would allow you to set a highpass for your ported sub (you dont need one with a sealed sub) to what you want but you would want to confirm that.

For my Martysub I have a high pass set at 17hz (using the plate amp) as once it gets lower than that my driver can start to have problems.
EndersShadow is offline  
Sponsored Links
Advertisement
 
post #12 of 55 Old 06-01-15, 02:04 PM Thread Starter
Shackster
 
Join Date: Apr 2015
Posts: 85
Re: Marty Cube start.

Sorry.....I am a bit confused....why would you set the highpass filter at 17hz?...........on the crown amp for example...wouldnt you set the lowpass filter to say 100hz? Everything below 100hz goes to the sub.....?
Anderslober is offline  
post #13 of 55 Old 06-01-15, 02:58 PM
Senior Shackster
 
EndersShadow's Avatar
Ender
 
Join Date: Sep 2012
Location: Brownsburg, IN
Posts: 330
My System
Re: Marty Cube start.

Quote:
Anderslober wrote: View Post
Sorry.....I am a bit confused....why would you set the highpass filter at 17hz?...........on the crown amp for example...wouldnt you set the lowpass filter to say 100hz? Everything below 100hz goes to the sub.....?
Yes and yes. However you need to roll the sub off at its tuning point in order to save your sub from getting frequencies it cannot reproduce without starting to cause problems with the voicecoil.

If your familiar with the concept of a "subsonic filter" is very similar.

Most plate amps on normal subs already have a subsonic filter built into them. Pro amps do NOT, so you need to set one.

Found these with a quick google search and hopefully they explain it better than I did...


Quote:
With regards to subwoofers, a high-pass filter is often used on ported subwoofer designs to protect the driver from over-excursion at or below the tuning frequency of the box. They are also sometimes used on sealed subwoofer designs to prevent sending unnecessary power to the subwoofer for frequencies that cannot be reproduced. For example, a ported subwoofer tuned to 20 Hz may require a HPF near 16-17 Hz to prevent the driver from exceeding its maximum rated excursion. WinISD Pro can be used to see the effects of different HPF frequencies on a given design.

Read more: http://www.hometheatershack.com/foru...#ixzz3bq2kIP00

In the case of a subwoofer there would be a low-pass so that only frequencies below what the mains are playing are sent to the subwoofer and there could be a high-pass to prevent very low frequencies that have the potential to damage a subwoofer. For instance, for vented subwoofers frequencies below the tuning frequency result in very large excursion demands which could cause the driver to attempt to move further than it can mechanically resulting in what is called bottoming which can result in mechanical damage to the driver.

Read more: http://www.hometheatershack.com/foru...#ixzz3bq2xuWGB
EndersShadow is offline  
post #14 of 55 Old 06-01-15, 03:36 PM Thread Starter
Shackster
 
Join Date: Apr 2015
Posts: 85
Re: Marty Cube start.

Ok...got it! You set the AVR crossover at say 80hz........then you set the sub amp hpf at 17hz.....everything below 17hz is filtered away so the sub doesn't overload/bottom-out.(relative to the subs tuning frequency of course).
As my martycube is ported......this is important........I just want to get it right so I dont blow something.

I am very tempted by the Dayton SA1000 or Crown xls2000...........I think either of these will go well with the martycube. Shucks.....can't wait to try it out!
Anderslober is offline  
post #15 of 55 Old 06-01-15, 03:40 PM
Senior Shackster
 
EndersShadow's Avatar
Ender
 
Join Date: Sep 2012
Location: Brownsburg, IN
Posts: 330
My System
Re: Marty Cube start.

Quote:
Anderslober wrote: View Post
Ok...got it! You set the AVR crossover at say 80hz........then you set the sub amp hpf at 17hz.....everything below 17hz is filtered away so the sub doesn't overload/bottom-out.(relative to the subs tuning frequency of course).
As my martycube is ported......this is important........I just want to get it right so I dont blow something.
Yup. Almost "all" plate amps you'd get from say parts express or another online vendor have built in low pass filters. Its also why lots of folks PREFER pro amps, so THEY can set that number and tune their boxes low.

It would be bad if you've got a box that can dig to say 10hz, but your plate amp has a subsonic/high pass setup at say 20hz......

Now you'd want to double check me on the Crown to make sure it can set a high pass filter that low, but if it can then its a good bet. And even if it "cant" its still a nice option since you can use RCA connections and regular speaker wire....

However on a spec's level the MQ-600 has better wattage spec's at both 4 and 2 ohms.....
EndersShadow is offline  
post #16 of 55 Old 06-01-15, 03:45 PM Thread Starter
Shackster
 
Join Date: Apr 2015
Posts: 85
Re: Marty Cube start.

Fantastic! Thanks for claryfying. I am still getting to terms with all the details..............
Anderslober is offline  
post #17 of 55 Old 06-04-15, 08:53 AM
Senior Shackster
 
Join Date: Jan 2014
Location: Adelaide
Posts: 121
The crown amp has high pass built in but only down to 50hz. You disable it in the main screen menu

You WILL need another high pass/ eq. Minidsp 2x4 balanced.

The balanced minidsp 2x4 will be needed. It has a higher output voltage that pro amps need to achieve full volume. The unbalanced May still work but it's not worth wasting money just get the balanced version.

The balanced version also uses xlr cables, they are better for shielding/noise and are cheap.

The actual connection is tricky but worth it and relatively easy. If you want download the minidsp balanced manual and check how it is done,

Believe me. It's worth it.
mikmaz is offline  
post #18 of 55 Old 06-04-15, 09:10 AM Thread Starter
Shackster
 
Join Date: Apr 2015
Posts: 85
Re: Marty Cube start.

Ok.....thanks for the info on the Crown amp. I read the manual, but I couldn't find what you found.
I am already seconds AWAY from pulling the trigger on a MiniDSP........
Anderslober is offline  
post #19 of 55 Old 06-04-15, 11:57 AM
Senior Shackster
 
Join Date: Jan 2014
Location: Adelaide
Posts: 121
Ok, make sure you get the correct plugin too. Otherwise won't work the same. I use 4way advanced plugin. It will do up to 4 subs
mikmaz is offline  
post #20 of 55 Old 06-04-15, 03:09 PM
Senior Shackster
Myles
 
Join Date: Nov 2010
Location: Austin, TX
Posts: 300
Re: Marty Cube start.

Check out my MiniDSP HOWTO. I have the balanced version. You'll need to move the sensitivity jumper.

ASK ME ABOUT CNC'ING YOUR NEXT BUILD!

To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
<-- SOLD!

To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
Wooderson is offline  
Reply

Bookmarks

Tags
cube , marty , start

Quick Reply
Message:
Options

Register Now




PLEASE COMPLETE ALL REQUIRED FIELDS BELOW... THANKS!

REQUIRED FIELDS ON THIS PAGE
YOU MUST COMPLETE ALL OF THESE

Username
Password
Confirm Password
Email Address
Confirm Email Address
Random Question
Random Question #2




User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
PLEASE READ BELOW PRIOR TO ENTERING AN EMAIL ADDRESS!

ATTENTION!

YOU MUST ACTIVATE YOUR ACCOUNT!

Activation requires you reply to an email we will send you after you register... if you do not reply to this email, you will not be able to view certain areas of the forum or certain images... nor will you be able download software.

AN INVALID EMAIL ADDRESS WILL CAUSE YOUR ACCOUNT TO BE DELETED!

See our banned email list here: Banned Email List

We DO NOT respond to spamcop, boxtrapper and spamblocker emails... please add @hometheatershack DOT com to your whitelist prior to registering or you will get nowhere on your registration.


Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML is not allowed!
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


For the best viewing experience please update your browser to Google Chrome