High power point source, 8" coaxial?

[weltersys]

With the coax driver(s) you are considering already having an integrated filter (crossover), you are adding more work and expense for yourself if you bypass it and use another amp module and DSP for the tweeter.

 

[Randy Bassinga]

With the coax driver(s) you are considering already having an integrated filter (crossover), you are adding more work and expense for yourself if you bypass it and use another amp module and DSP for the tweeter.

Always noticing integrated filters being looked down upon, hence thought to just proceed to two-way active and didn't stop to consider as is. I think I will follow your advice and try it out as it is first. The potential to go active will always be there

 

[Randy Bassinga]

@weltersys
Art, I noticed your comment in another thread re Re 😀

So if I am running sims on this PRO-ZT69 or the ZR6.4D and its 12" version, should I be setting 1w or 2w as baseline runs? Could this be why my sims are showing lower efficiency than rated, as I did the runs at 1w? Should I change to 2w for baseline sims?

 

[Randy Bassinga]

I passed up on the 8" and have the racer coming in. Immediate need is a very compact single cab solution that covers as much of full range and solid output. I have the 12" ZR12.4D sub and amps already. Considering mounting a single 6x9 over the 12" and in its own volume. Using the integrated filter for the racer and a separate amp for the subwoofer section. Not sure if I should use one racer or two above the 12". Could I toe them out or far in for a stereo image? Maybe it will be better to make them as operate boxes and align and test to see if possible. If not, It would be more elegant with a single racer on top of the 12 looking like a wide horn

 

[weltersys]

So if I am running sims on this PRO-ZT69 or the ZR6.4D and its 12" version, should I be setting 1w or 2w as baseline runs?

Power is measured in watts (w).

1 watt one meter is a standard "baseline" measurement used for specifying loudspeaker sensitivity.
The speaker's impedance is considered to be some nominal resistance, specified in "ohms" (Ω), even though the impedance varies with frequency.

Ohm's law states:electromotive force (in volts, or V) equals current (in amps, or I) times resistance (or impedance, in ohms or R), or V=I*R.

A derivative of Ohm's law used to determine the electrical power a speaker draws:
Voltage squared (multiplied by itself) divided by resistance/impedance equals power, or V2/R=P.
2.83 x 2.83 =8.0089
8/1=1 (watt).

A nominal "8 ohm" driver receiving 2.83 volts draws 1 watt.
A nominal "4 Ohm" driver receiving 2.83 volts draws 2 watts.
A nominal "2 Ohm" driver receiving 2.83 volts draws 4 watts.

Could this be why my sims are showing lower efficiency than rated, as I did the runs at 1w?

Efficiency is expressed in percentage of electric/acoustic watts, I have not noticed any percentages in your posts.
If you want to convert 1/w 1m sensitivity to efficiency, you can use this calculator:
https://sengpielaudio.com/calculator-efficiency.htm

Should I change to 2w for baseline sims?

No, but you should consider the impedance curves of the drivers and current limitations of the amplifiers you will use.

Art

 

[Randy Bassinga]

Thanks again Art. I hope that I am modeling this driver correctly as when given about 10L and around 75Hz port, it sims insane levels (for me) bass around 60-200hz

Thanks for bringing up the amplifier current ability. I have been trying to keep an eye on the impedance curve and working closely with the amp designer Erica.C to make sure that I am using the correct modules for the task and even ordering hardened bridged 4R capable and 2R capable single and dual channel units. I have picked up a few over time and the will order a pair of hardened 600wrms ones next

 

[Sam Ash]

I have a related question on this thread:-

https://www.diyaudio.com/community/...ack-can-to-wooden-box-with-less-depth.417045/

Maybe members on this thread can help....