Is there a place to buy a cubby subwoofer/enclosure?

Check the fit. If there's room, it might be easier to lay up additional layers to the outside. Adding them to the inside where you can't see well, may lead to air bubble that can weaken the structure.

But, it looks like it's coming along well.

 

There are some areas where I could add to the outside but in most cases, the fit is extremely tight. Like I said, I am done glassing. As soon as the terminals come in I will install and put the rest of it together to see how it performs.

Thanks!

 

He's not, so don't worry.

 

I am interested in making a an enclosure for my GenIII prius. I found an old 10" blaupunkt and a JBL GTQ240 amp thats been sitting in my basement for 8+ years that I've forgotten. I have made a few home speaker box but never work with fiberglass before.
Spiderman, can you tell me how much resin you end up using?
Tim, you said 2 gallon. But that seem like a lot to build just 1 enclosure.
And if you do mind, please give me a list of things I might need.
Thanks in advance.

 

Hey alright, someone else ready to give it a try. I was going to do a write up but was hoping to fully finish first. But my terminals might be in tomorrow or next week.

Anyway, I ended up using a gallon. Mine is probably no where near as think as Tim's enclosure either. I won't know if that will make a difference till I get the thing operational.

I used 4+ yards of 3/4 oz mat and probably 3 sqft of the fleece, a bunch of brushes as a 1/2 roll or painters tape.

Get yourself a really good painter's respirator! Make sure you have really good ventilation where ever you end up doing it!!!!

Good luck!

 

Good plan. I did replace the HU and the rear speakers... follow the A/V upgrade link in my signature.

 

Arrg, I just checked the volume of the enclosure (by adding water) and it is 21.5 quarts or 20.34 liters. The Hertz 250 requires 11.03 liters for 50Hz or 16.13 liters for 55Hz.

My question is, if I fill with the polyfill, does the effectively reduce the volume? Wonder if I should try to reduce the volume upfront? Any clever ideas on how to do that?

 

Consider a few sound checks before you decide. You might be surprised. While I know the Hertz specs are accurate, consider this is a car, not a sound studio.

Using Polyfill in a Custom Subwoofer Box | Klaus Audio
http://www.hertzaudiovideo.com/Doc/pdf_hx250.pdf

 

Polyfil increases the volume

 

Yeah, I read the polyfill article last night after I posted. So I would likely not use that as it effectively increases the volume (thanks for pointing that out also Tim).

I still haven't received the terminals yet but I think I will temporary assemble this weekend and see how it sounds.

I may block off close half of the enclosure on the inside using foam with a few layers of mat/resin over that if isn't pumping out the low frequencies.

 

Some have used shot bags and other removable solid fill objects inside as a tempory medium for testing.

 

Well I temporarily hooked up the speaker in the enclosure and then to my old home receiver. I must say, it did really well despite the receiver a hundred and fifty watts underpowered. It shook the room it was in pretty well. No rattling from the enclosure at all. Everything in the room rattled though. I took a video but they never capture the essence and probably not worth posting.

In any case, I am pretty happy so far.

Question: so what is the drawback of having too much volume in the enclosure?

 

I notice that the specs (size-wise, enclosure requirements, etc.) are identical for the Hertz HX250 (not the "D" version). So, what's the drawback of using one of those? I can't see any practical purpose for me regarding the dual voice coils (didn't I read somewhere that the 250 doesn't have that, but the 250D does? I could have imagined that, though...!) I have someone trying to sell me a new one shipped to me for about $189, which seems like a reasonable price....as opposed to the $399 prices I keep finding for the "D" model. Is the "D" gonna do $200 worth of additional things for me? All I do 98% of the time in my car is watch movies. I might listen to music the other 2%.... So, it's kinda more important for me to hear the voices/speaking in the movies, as opposed to thumping to heavy bass music...

 

1.04 - What happens if the box is too small?
If the box is too small will typically result in a boomy system that appears to have strong midbass and less low bass. Typically power-handling is improved though, unless the box is REALLY too small! You can compensate somewhat for a small box volume by adding stuffing to the box. The stuffing can make the box appear up to 40% larger to the driver. Note that sealed systems are generally a lot more tolerant of variation in box volume than are the other tuned-port systems such as the ported and bandpass systems.
1.05 - What happens if the box is too large?
Typically the low frequency extension of the system improves a little, at the expense of powerhandling. The bass will also sound tighter and "drier", which might not suit your listening tastes. In the case of vented systems, a too-large box may introduce a response peak around the the resonance frequency of the system.

 

The "D" model of the Hertz speaker (as I understand it) simply designates a dual voice coil speaker versus the standard single voice coil. Effectively, the only difference is the impedance possibilities. A single 4-ohm can only be run at 4ohms...with a dual 2-ohm voice coil speaker, you can run it in series for a 4 ohm load or parallel for a 1 ohm load to get more output out of your amplifier (if it can handle loads that low.)

 

So, do you feel the difference is worth a couple of hundred bucks in price?

 

Um, hopefully, as the passenger? LOL

 

That all depends on your amp. Is it 4Ω?