Home Theater Forum and Systems - HomeTheaterShack.com - Search Results

Advanced Search
Showing results 1 to 25 of 168
Search took 0.01 seconds.
Search: Posts Made By: dgmartin
Forum: IB - Infinite Baffle Subwoofer Build Projects   10-31-17, 10:28 PM
Replies: 17
Views: 3,274
Posted By dgmartin
Re: IB Mid-bass Output

Just to clarify things, when you say IB, are you referring to a large closed box as an or just a driver in a large baffle open at the back (dipole)? In a dipole you get cancellation when the distance...
Forum: DIY Speakers   04-07-17, 09:15 PM
Replies: 7
Views: 783
Posted By dgmartin
Re: Speaker and Crossoer Opinion

Hi, the down side is more power amps and also more speaker cable runs. Often a good compromise is to power the woofers from a bigger amp, and leave the tweeter/mids to another. The expensive...
Forum: DIY Speakers   06-02-16, 09:54 PM
Replies: 4
Views: 893
Posted By dgmartin
Re: Help with wiring and speaker box

That's a sound advice...
Forum: DIY Speakers   05-15-16, 09:43 PM
Replies: 30
Views: 4,256
Posted By dgmartin
Re: diy mtm using Dayton pro drivers

If you receiver has pre-outs and provides the amplification for a "Zone 2", then you should be able to feed the pre-outs into the analog-in of the "Zone 2".
Forum: DIY Speakers   05-11-16, 08:43 PM
Replies: 30
Views: 4,256
Posted By dgmartin
Re: diy mtm using Dayton pro drivers

I wouldn't consider changing parts on a pre-made crossover as your final crossover will likely require more components (series resistors, parallel notch filters etc...) than the original board...
Forum: DIY Speakers   05-10-16, 10:03 PM
Replies: 30
Views: 4,256
Posted By dgmartin
Re: diy mtm using Dayton pro drivers

I fully agree with DqMcClain's comments about directivity and beaming and the design tradeoffs related to matching cone drivers to dome tweeters.

However with the waveguides we are controlling...
Forum: DIY Speakers   05-09-16, 09:57 PM
Replies: 30
Views: 4,256
Posted By dgmartin
Re: diy mtm using Dayton pro drivers

No you do not want to go from a 12in woofer to a tweeter (dome) but you are on the right track with a compression driver with a 12in waveguide.
The stated 104dB sensitivity of the compression...
Forum: Home Theater Receivers | Processors | Amps   05-03-16, 10:29 PM
Replies: 7
Views: 991
Posted By dgmartin
Re: Higher Speaker Impedance ;- Flatter power amp FR?

If the power amp has high output impedance, then the higher impedance speaker has better damping factor: A high output impedance amplifier is not a perfect voltage source anymore and its output will...
Forum: DIY Speakers   05-03-16, 10:14 PM
Replies: 30
Views: 4,256
Posted By dgmartin
Re: diy mtm using Dayton pro drivers

Moving to the 12 inches is a good move since it allows to use a larger waveguide and achieve better directory control. About the waveguide and compression driver, search "SEOS waveguide" or "Fusion...
Forum: Home Theater Design and Construction   04-22-16, 09:03 PM
Replies: 6
Views: 1,075
Posted By dgmartin
Re: Matching a center channel

With 300$ I would get only the 2 front main speakers. I would be looking for used stuff, too. I you plan to invest more later, prefer bookshelf speakers that you can later use a surrounds.
Forum: Remotes | Cables | Accessories | Tweaks   04-20-16, 09:45 PM
Replies: 28
Views: 3,808
Posted By dgmartin
Re: signal propagation through audio cable.

Yes 0.1uf/0.2Ohms gives a -3dB at this frequency. However if you use a typical amplifier input impedance of, say 50k, the numbers are quite different. Don't worry: interconnects are going to have C...
Forum: Home Audio Acoustics   03-30-16, 09:58 PM
Replies: 5
Views: 2,609
Posted By dgmartin
Re: Do I even need bass traps at all?

Hello Talley,
Dynamat will more than likely drop the resonance frequency of your panels below 70Hz (added mass). Difficult to estimate how much not knowing thickness, materials... anyways you are...
Forum: DIY Subwoofers - General Discussion   03-20-16, 07:23 PM
Replies: 23
Views: 2,459
Posted By dgmartin
Re: Multiple XLS10 sealed subs combined with 2 'ULF' subs

Hello Kelvin, I'm just catching up... Looking at the graphs from post 19 and trying to confirm my understanding of what is happening. How far is the MLP from the front wall?
Forum: DIY Subwoofers - General Discussion   03-18-16, 10:17 PM
Replies: 23
Views: 2,459
Posted By dgmartin
Re: Multiple XLS10 sealed subs combined with 2 'ULF' subs

That's a pretty good response. With EQ you will have the headroom for any realistic house curve you like. With such measurements, I'm still wondering why 8 XLS10 are still needed... It will really...
Forum: DIY Subwoofers - General Discussion   03-17-16, 10:50 PM
Replies: 23
Views: 2,459
Posted By dgmartin
Re: Multiple XLS10 sealed subs combined with 2 'ULF' subs

Thanks for sharing that info. Very good work going on here. I wish I had some free time to run a simulation of your room with all of your subs.

I see your room modal distribution lacks in the 63Hz...
Forum: DIY Subwoofers - General Discussion   03-16-16, 10:04 PM
Replies: 23
Views: 2,459
Posted By dgmartin
Re: Multiple XLS10 sealed subs combined with 2 'ULF' subs

Sounds like a good plan though I would start with only 2 additional subs. No direct experience with the Peerless (I read everywhere that my Scanspeaks are supposedly XLS clones but the T/S are...
Forum: REW Forum   03-15-16, 10:14 PM
Replies: 10
Views: 1,564
Posted By dgmartin
Re: Total newbie, first REW result

Yes normally you measure each separately. You listen with both ears but then they are not at the same location so even the sound from one speaker will arrive to each ear at different time (your brain...
Forum: REW Forum   03-14-16, 10:37 PM
Replies: 8
Views: 1,114
Posted By dgmartin
Re: Find Crossover of 3-Way Passive Speakers?

+1



Agree that the blue curve should logically be the midrange but you also get a lot of the tweeter’s response in the blue curve since the tweeter is omnidirectional at these frequencies (ka <...
Forum: REW Forum   03-13-16, 10:32 PM
Replies: 8
Views: 1,114
Posted By dgmartin
Re: Find Crossover of 3-Way Passive Speakers?

REW has the required measurement capabilities but the problem is to be able to play each individual drivers at the same time. Do you have 3 pairs of binding posts at the back? Otherwise it may still...
Forum: DIY Speakers   03-08-16, 09:46 PM
Replies: 1
Views: 696
Posted By dgmartin
Re: Semi anechoic loudspeaker measurements?

Yes it is possible. You should be able to use gated measurements with the "IR Windows" to avoid including the first reflection(s). However this will limit your ability to measure anything below,...
Forum: DIY Speakers   03-05-16, 10:08 PM
Replies: 6
Views: 1,427
Posted By dgmartin
Re: I.S.C.T. Speaker with dual 'Sealed & Vented' compartment enclosures ....

In acoustical-mechanical terms, you can add any combination of chambers (springs) and ports (masses) to back-load the drivers but each end of the network will be either a spring connected to the...
Forum: DIY Speakers   03-05-16, 09:40 PM
Replies: 11
Views: 3,840
Posted By dgmartin
Re: Wanted: DIY design for shallow, way-bad full range HT speakers

My earlier post was just to put the rear port placement in perspective in relation to other boundary effects. Normally you just want your mains far enough from the wall so the notch is in the sub...
Forum: DIY Speakers   03-02-16, 09:55 PM
Replies: 11
Views: 3,840
Posted By dgmartin
re: Wanted: DIY design for shallow, way-bad full range HT speakers

One problem with placement near the front wall is the strong reflections that create cancellation (dips) in the response (when the distance is equal to a quarter or the wavelength). The closer to the...
Forum: DIY Audio   03-02-16, 09:25 PM
Replies: 10
Views: 3,201
Posted By dgmartin
Re: what can I gain from DIY

I have no direct experience with the Fusion 8 speakers but my mains speakers are somewhat similar. IMO, with a subwoofer, it will be difficult to get that combination of dynamics & balance near that...
Forum: DIY Subwoofers - General Discussion   03-01-16, 03:28 PM
Replies: 30
Views: 3,325
Posted By dgmartin
Re: How many is too many?

With regards to the number of subs, this is a law of diminishing return. The sweet spot seems to be between 3 and 4. Everyone's room is different.
Showing results 1 to 25 of 168

 
 


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