Mid-bass in SQ application questions.

[Colin - STAPUFT]

Who had the SQ winning Buick Regal back in the day? I can't remember his name... He retired it. He had all JBL in one of its stages and it was in one or several of the mags.

He had his tweeters and mids way up and back in the kicks and they were off axis. But to get the midbass that he needed, they weren't in a sealed enclosure: he cut the car and had them in a space that went all the way up into his fenders. That was "vented" to the outside of the cabin with an aperiodic vent. Big enclosure for big midbass. ...I think he was running 6.5"s?

Oh, and no door speakers if memory serves. 2 way for mids and tweets, woofers in the back. -minimized the phasing issues.

[never knows best]

http://www.usdaudio.com/sw/cars/buick/

[Colin - STAPUFT]

http://www.usdaudio.com/sw/cars/buick/

close. Here we go- Gary Biggs.

http://www.enjoythemusic.com/garybiggs.htm

http://www.g-body.org/tnt/audio/install.php

http://www.diymobileaudio.com/forum/technical-advanced-car-audio-discussion/59337-gary-biggs-mid-diffusor.html

[kirill007]

If you put your mid-range or tweeter in a tighter corner the spatial loading screws with the frequency response like crazy.

Depends on how they're facing, though. Right?

Like everything when dealing with spatial loading, or more commonly known here as just loading, it is frequency dependent on when your going to get more or less of a gain in dB. When looking at direction, it is hard for a speaker to produce the same of-axis response as a on-axis response. There are however optimal size speakers for given frequencies for the most optimal off-axis response. I believe that it goes tweeters:1-inch midrange:6 to 6.5-inch midbass: 10-inch, woofer:12/15-inch and for subwoofer I think anything 12-18 is close to the same.

Currently researching this for my own doors. This link suggests a 1", a 4" an 8" and a sub... http://education.lenardaudio.com/en/05_speakers.html

That it what I was remembering. I sad slightly off on the midrange, but everything else was within the given range.

That would be if the frequency responses of all the drivers overlapped properly, size isn't that important.(unless the cone is too big which can cause beaming)

SO would 1", 6.5", and 8" be so much more different than 1", 4", and 8"?

It depeds on the frequency responses of the drivers, but usually a 1inch tweeter and a 6.5midrange won't work that well, there will be a hole in the midrange or you'll have to let the tweeter play too low which lowers the power handling.

[White Lightning]

http://www.usdaudio.com/sw/cars/buick/

close. Here we go- Gary Biggs.

http://www.enjoythemusic.com/garybiggs.htm

http://www.g-body.org/tnt/audio/install.php

http://www.diymobileaudio.com/forum/technical-advanced-car-audio-discussion/59337-gary-biggs-mid-diffusor.html

Guys, you can't really use this car as a daily driver example ... Notice the completely redesigned dash engineered strictly for sound quality ???

[Kevin M]

The grand national that speakerworks built and Richard Clark refined was a beast. 12" rear mounted midbass. Cats pajamas. Heard it had way more impact in the midbass area than the sub's but they were aperiodic.

[never knows best]

The grand national that speakerworks built and Richard Clark refined was a beast. 12" rear mounted midbass. Cats pajamas. Heard it had way more impact in the midbass area than the sub's but they were aperiodic.

and those horns..... just wow-

[trumpet1]

I've demoed Gary Biggs' Regal. It is not like any normal daily driver car. It's great, but discussing it here is not staying on topic at all.

Every speaker location has pros and cons.

Kick panels can help equalize path lengths, which is helpful for focusing the sound for two seats. Sound is prone to being blocked by the underside of the dash and our bodies. You may hear the "rainbow" effect of the music pulling toward the kick panels at times.

In the last decade or so the trend shifted to putting mids and tweeters on axis on the A-pillars. The logic here is you have to have speakers up high to image and stage above the dash. While it's true that putting your speakers up where you want the sound stage to be will guarantee that stage height, it introduces reflections which cannot be addressed with EQ. The A-pillars are also usually not as far apart as the kick panels or door panels, so stage width suffers.

Putting speakers in the door panels eliminates one source of reflections as you turn the door into a baffle. Stage width is good because the speakers are placed physically to the outer sides of the interior. You can trick yourself into hearing some frequencies as coming from outside the vehicle with reflections, but that trick doesn't work for all frequencies. So we compromise by placing speakers far to the left and right. Downsides of door-mounted speakers: hard panned sounds in music really become localizable. Time delays are required for creating a sound stage above the dash. Two-seat imaging is not possible with this configuration. Adding a center channel and an upmixer can really transform this into a fun sounding configuration.