A/V receiver not passing below 30hz to sub ? help - AVS Forum
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post #1 of 18 Old 02-16-2014, 02:36 PM - Thread Starter
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Just hooked up my new Blaupunkt VPW-460 1800w 18" sub to my behringer ep2500 and just testing it's frequency response. When I play one of these bass tests online anything below approx 30hz there is a massive dropoff and the sub barely moves. I have a sony strdn1020 a/v receiver and I cant seem to find anything in the setup menu to alter the LPF to the sub. Can anyone help ? The sub goes seriously loud, but not below about 30hz, the fact it's not moving below this frequency tells me it must be being filtered.

Anybody knowledgeable with these receivers ?

Thanks in advance.
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post #2 of 18 Old 02-16-2014, 04:48 PM
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is it in a box? the box significantly affects how a woofer behaves. If it's ported, the driver will be at minimum movement at the port tuning frequency even though output should be significant. moreover, without a box, the front wave and back wave cancel and you should expect spl to drop like a rock as you go lower. At least AIUI.
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post #3 of 18 Old 02-16-2014, 05:22 PM
 
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Quote:
Originally Posted by VanillaRice View Post

Just hooked up my new Blaupunkt VPW-460 1800w 18" sub...

Is this a subwoofer that you put together yourself? Or is it a driver that's out in the open?
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post #4 of 18 Old 02-16-2014, 05:53 PM - Thread Starter
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The sub is in a box yes.

BeeMan not quite sure what you mean. It's mounted to the box and should in theory be working at sub 30hz frequencies.
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post #5 of 18 Old 02-16-2014, 05:58 PM
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Whether it should be working depends on the Thiel - small specs of the driver and the size of the box. A small box will choke a driver. Needs LOTS of EQ to be flat
If its going into a car cabin gain will start octaves higher than a room in a house so you need to check it out in the setting it will be used.
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post #6 of 18 Old 02-16-2014, 09:04 PM
 
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Quote:
Originally Posted by VanillaRice View Post

The sub is in a box yes.

BeeMan not quite sure what you mean. It's mounted to the box and should in theory be working at sub 30hz frequencies.

Is it in a subwoofer box, built to specs for the driver as this will make a difference in it's performance characteristics. A suggestion, stop by the DIY thread as those guys build subs for home use, which is different than subs for a car. I know little to nothing about the proper way to figure out how to build a proper subwoofer box. These guys do it all the time and for sure will be able to give you insight but it sound like you're enclosure isn't right for home use and this is what's killing your sound.
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post #7 of 18 Old 02-16-2014, 11:26 PM - Thread Starter
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I bought the sub and enclosure from someone who had this setup installed in his car. I understand each enclosure has their own sound characteristics, but surely the driver would be moving in the infrasonics. I have a feeling my dip switches on the back of my ep2500 are not set correctly. I notice that one has a low cut filter set to 30 hz. You can turn the low cut filter off but is still behaving much the same.
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post #8 of 18 Old 02-17-2014, 01:29 AM - Thread Starter
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Ok I just did an audyssey setup on my receiver and low and behold I can hear a 20hz test tone through the sub now. Audyssey appears to be able to configure the crossovers but for the life of me I don't know how to set it manually on this receiver.
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post #9 of 18 Old 02-17-2014, 04:45 AM
 
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Have you stopped by the DIY thread?
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post #10 of 18 Old 02-17-2014, 06:20 AM
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Quote:
Originally Posted by VanillaRice View Post

I bought the sub and enclosure from someone who had this setup installed in his car. .
A sub that's perfectly configured for listening to music in a car will not work well in a home for HT. In this case, the driver Fs being 37Hz it simply cannot work below 30Hz. In a small sealed enclosure ideal for a car it probably has an f3 no lower than 50Hz.

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post #11 of 18 Old 02-17-2014, 01:46 PM - Thread Starter
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Yes your right Bill, the Fs is quite high. Originally planned for the SI 18" but high shipping costs meant I had to purchase locally here in New Zealand.

My enclosure is approx 4.6cu ft, dual port designed for high spl. It most certainly fills my high ceilings now, my old 300watt 10" m6as mission couldn't pressurise my large living area so this setup will definitely do the job for now.
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post #12 of 18 Old 02-17-2014, 10:59 PM - Thread Starter
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My apologies, my cu meters to cu ft conversion was way off. The box dimensions are 95cm x 60cm x 44cm which equates to 0.250cu meters or 8.82cu ft so it certainly isn't small. I'll stop by the DIY threads and try to see what modifications I can do to tweak it for the sound I'm looking for but as you say I seem to be limited by the subs specs. On a side note I played a 20-30hz test tone and there is a dramitic difference between 26-27hz. 27hz seems to be the lowest this sub/enclosure setup can efficiently produce a nice sound without dropping off dramatically.
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post #13 of 18 Old 02-18-2014, 07:53 AM
 
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Pushing the issue. Just saying, it appears you still haven't stopped by the DIY forum where you can get better input. You're welcome to stay, I'm suggesting you'll find more data at the DIY forum. Most of us here, are about pre-made, ID subs or if you will plug-n-play subwoofers.
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post #14 of 18 Old 02-18-2014, 10:20 AM - Thread Starter
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post #15 of 18 Old 02-18-2014, 10:42 AM
 
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Quote:
Originally Posted by VanillaRice View Post

That's fine BeeMan. I continued the discussion here:

http://www.avsforum.com/t/1518494/how-can-i-impove-this-sub-enclosure-for-my-home-theater#post_24374972

I hope you get answers there from those infinitely more qualified than I. I'd hate to think you spent all that money and the best you could do was 27Hz.

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post #16 of 18 Old 02-18-2014, 01:01 PM - Thread Starter
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Yes I hope I can do better than 27Hz. Although I must say for 27hz and above I don't think I'll ever complain about weak bass or high ceilings ever again hehe
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post #17 of 18 Old 02-18-2014, 01:02 PM
 
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post #18 of 18 Old 02-19-2014, 03:32 AM
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Bill gave you an answer, the sub most likely will not be strong under 30 Hz.

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