Recent content by AstroSonic

Still wondering why this is a problem. Several feet away and it probably is not even noticeable. Yet, you are benefiting from the extra volume provided by the external cab. If anything, the real problem is that the 4 ohm internal drivers are using roughly twice the power received by the...

It would be helpful to know what you are trying to accomplish. For example, more volume or a change in tone. Also, do you like the tone of the stock amplifier? Your choice of driver (BP-102) has a relatively low sensitivity (produces less volume than most bass guitar drivers), and has a...

I eventually replaced the stock 15 inch (actually a decent driver) with a Basslite S2012, and the piezo horn with a Apt 80 horn crossed at 3.5 kHz 3rd order. Power is reduced to about 140w (8 ohm vs 4 ohm driver), but it sounds significantly louder. It sounds both deeper and more articulate...

I find the Fender Rumbles to be aptly named. Lots of bass, but not the last word in articulation. They are reasonably priced, build quality is good, weight is light and reliability is very good. Many players are pleased with the tone. If you are not, you need to look elsewhere, often at...

The Jensen Mod 15-200 will NOT work well in an open back cabinet. Qts is much too low. The driver will go quite low (to the upper 40's) in a largish, optimally tuned cabinet. Unfortunately, it does not seem to have enough Xmax to support that use at more than low power/volume levels. Smaller...

The short answer is yes, it can be used for bass guitar. Based on the TS parameters (Invalid Link Removed) the driver is suitable for ported bass cabinets. The sensitivity is relatively high (98.6 db,1w, 1m), so it would work quite well with low power tube amps. The only questionable issue...

That was not meant to be taken seriously... :-)

You could get close by wiring the 32 ohm drivers in two 810's in series, for 320 ohms in each cab and a total of 640 ohms for the two cabs.

All true. By this point, the OP should realize that these designs are unreliable, expensive and wildly impractical for bass guitar amplification.

They are far ABOVE the point of diminishing returns, at least for bass guitar amplification. I am obviously not advocating for these designs.

If you are really determined to build a output transformer less amplifier, do a google search on Julius Futterman, and Transcendent Sound OTL amplifiers. None of these circuits are economical to build. They usually involve the use of several output tubes run in parallel to bring the output...

I assumed that the OP would be working from a schematic and layout diagram. I suspect that many players would actually want an output transformer because of the saturation impact on the sound.

You can find a wide variety of used transformers on eBay. You just need to know what you are looking for. Don't forget about the cost of a chassis, passive components (resistors, caps, pots, switches, speaker & input jacks, etc.) and tubes. If you haven't done something like this before...

The Beta 12A sounds very similar to the S2012 across the entire range. What is it about the S2012 that you want to address with a new driver? Something about the bass... upper mids...? Did you retune the cabinet for optimum results?

That cab is a little on the small side for that driver. So yes, there is a quite audible mid bass hump. Many players like, and even prefer some bass peaking in that area. It provides some extra meat on the lower bass notes. To try the S2012 without the bass peaking, stuff an old towel in the...