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Search: Posts Made By: JackNC
Forum: DIY Speakers and Subs   04-20-2015, 09:48 AM
Replies: 18
Views: 553
Posted By JackNC
Once you have enough RAM, you are better off...

Once you have enough RAM, you are better off spending your money on solid state drives to speed up the storage subsystem or a GPU to speed up the DSP....
Every 3-5 years you should upgrade the...
Forum: DIY Speakers and Subs   04-18-2015, 05:20 AM
Replies: 38
Views: 638
Posted By JackNC
firing from the corner and wanting clean out to...

firing from the corner and wanting clean out to 300 Hz ?

You need to watch out for boundary null around 200Hz or so, depending on box size from a direct radiator mounted diagonally across the...
Forum: DIY Speakers and Subs   04-14-2015, 03:26 PM
Replies: 22
Views: 467
Posted By JackNC
or to be even more precise "balanced,...

or to be even more precise "balanced, differential" :)
Forum: DIY Speakers and Subs   04-14-2015, 09:50 AM
Replies: 22
Views: 467
Posted By JackNC
Hi LTD: Do any of those have differential...

Hi LTD:

Do any of those have differential outputs?

Thanks,
Jack
Forum: DIY Speakers and Subs   04-12-2015, 02:35 PM
Replies: 80
Views: 1,999
Posted By JackNC
That is an awesome amp and it looks like all the...

That is an awesome amp and it looks like all the DSP you'll ever need with both FIR and IIR filters available. Do you really need that much power to drive your mains?

If all the equipment in...
Forum: DIY Speakers and Subs   04-12-2015, 07:28 AM
Replies: 80
Views: 1,999
Posted By JackNC
I agree with both your numbered points and was...

I agree with both your numbered points and was really just looking for confirmation.

But I still think there is value in seeing the number on a data sheet. If the manufacturer can't be bothered ...
Forum: DIY Speakers and Subs   04-09-2015, 01:47 PM
Replies: 80
Views: 1,999
Posted By JackNC
I looked at those Yamaha Amps but, if I recall...

I looked at those Yamaha Amps but, if I recall correctly, they are rated at .5% THD at close to full power. Their data sheets don't give a hint about how low the THD gets when you are 3 db or more...
Forum: DIY Speakers and Subs   04-09-2015, 01:38 PM
Replies: 80
Views: 1,999
Posted By JackNC
That is a reasonable position but in some cases...

That is a reasonable position but in some cases an input attenuator can make sense. The more output you have from the source, the higher the signal is above the noise floor of the source. If you...
Forum: DIY Speakers and Subs   04-09-2015, 07:24 AM
Replies: 80
Views: 1,999
Posted By JackNC
Nate: Can I draw you out on why you want...

Nate:
Can I draw you out on why you want adjustable gain instead of an input attenuator? I would have thought the opposite. The higher the level the source provides the higher it is above its noise...
Forum: DIY Speakers and Subs   04-09-2015, 07:11 AM
Replies: 80
Views: 1,999
Posted By JackNC
I agree. Fanless is huge and I don't know about...

I agree. Fanless is huge and I don't know about fan noise on the QSC.
OTOH: I only need 125W and that Crown CT-4150 is fanless.
Ultimately my amps will be in my laundry room at the back of my...
Forum: DIY Speakers and Subs   04-09-2015, 07:05 AM
Replies: 80
Views: 1,999
Posted By JackNC
thanks for making me aware of the SDS-470 and...

thanks for making me aware of the SDS-470 and Class D Audio. I'll keep my eye on them.
Forum: DIY Speakers and Subs   04-08-2015, 04:23 PM
Replies: 80
Views: 1,999
Posted By JackNC
the specs and whitepapers on the Hypex website...

the specs and whitepapers on the Hypex website are impressive but the also sell Rhodium plated connectors.
I just went through a pricing exercise with 4 ucd400 modules plus the smps1200 supply and...
Forum: DIY Speakers and Subs   04-08-2015, 05:35 AM
Replies: 6
Views: 141
Posted By JackNC
Can you show your LLT results. I've got 4 of...

Can you show your LLT results. I've got 4 of those drivers also....
Forum: DIY Speakers and Subs   04-07-2015, 07:49 AM
Replies: 622
Views: 21,584
Posted By JackNC
I just saw a note in a white paper on the Hypex...

I just saw a note in a white paper on the Hypex web site that arbitrarily low distortion can be obtained at LF with feedback in a class D amp but if overdone or not down right can hurt the overall...
Forum: DIY Speakers and Subs   04-06-2015, 10:46 AM
Replies: 622
Views: 21,584
Posted By JackNC
Just noticed that at 10 Hz the THD is high again....

Just noticed that at 10 Hz the THD is high again. Is that a sign the power supply is having trouble sustaining the note, if you can call 10 Hz a note.?
Forum: DIY Speakers and Subs   04-06-2015, 10:37 AM
Replies: 622
Views: 21,584
Posted By JackNC
Its curious that the THD is so very low at low...

Its curious that the THD is so very low at low frequencies. That it shoots way up past the mid range is probably typical for "sub amps"
Forum: DIY Speakers and Subs   04-05-2015, 09:13 AM
Replies: 622
Views: 21,584
Posted By JackNC
Question about Crown Amps power rating - is it...

Question about Crown Amps power rating - is it RMS or peak or ?
Their data sheets just say "watts"; nothing about RMS or peak.

I'm starting to really like the CD4150 for my CDs and synergy...
Forum: DIY Speakers and Subs   04-03-2015, 10:45 AM
Replies: 622
Views: 21,584
Posted By JackNC
I think there is a good chance it will too, since...

I think there is a good chance it will too, since surrounds aren't as important or driven as hard. I don't know about mains though. I know my ears can tell the difference between a marginal amp and...
Forum: DIY Speakers and Subs   04-03-2015, 06:57 AM
Replies: 622
Views: 21,584
Posted By JackNC
OTOH, distortion on the QSC is 20 db lower. That...

OTOH, distortion on the QSC is 20 db lower. That big a difference is hard to ignore.
Forum: DIY Speakers and Subs   04-02-2015, 08:18 PM
Replies: 622
Views: 21,584
Posted By JackNC
Hey, thanks for those two recommendations but...

Hey, thanks for those two recommendations but they only have enough power for my CDs. I'm still looking for at least 250W at 8 ohms for my mids that cross to the CD at about 1 Khz.

Interesting...
Forum: DIY Speakers and Subs   04-02-2015, 12:24 PM
Replies: 622
Views: 21,584
Posted By JackNC
I still want to believe that the NU4-6000 is good...

I still want to believe that the NU4-6000 is good enough for my mids. If I buy one to try and don't like it, I guess I'll have to build more subs:(
Forum: DIY Speakers and Subs   04-01-2015, 07:57 AM
Replies: 622
Views: 21,584
Posted By JackNC
Thanks for confirmation re the CT-875. I...

Thanks for confirmation re the CT-875.

I guess what I like most about the NU4-6000 is its price. Its almost 4x$ for amps that have strong endorsements for use on mains.
I really want to believe...
Forum: DIY Speakers and Subs   03-31-2015, 08:20 AM
Replies: 622
Views: 21,584
Posted By JackNC
but, at least based on you distortion tests, it...

but, at least based on you distortion tests, it looks really good - past 1 Khz - for the low end of a 2-way. Do you agree?

I'm thinking about pairing one of these with a Crown CT-475 powering the...
Forum: DIY Speakers and Subs   03-29-2015, 09:22 AM
Replies: 22
Views: 499
Posted By JackNC
Its cancellation and standing wave nulls that...

Its cancellation and standing wave nulls that shouldn't be boosted with EQ. Just gently bringing up the low end roll off, as with a Linkwitz Transform is perfectly OK.
Forum: DIY Speakers and Subs   03-29-2015, 07:00 AM
Replies: 122
Views: 7,664
Posted By JackNC
I really don't want to make a PC integral to the...

I really don't want to make a PC integral to the solution and I've realized that, due to copy protection, one really needs to take the audio from an HDMI output. It would be really nice if Behringer...
Showing results 1 to 25 of 279

 
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